[ { "sku": "W61901", "brand": "SKF", "manufacturer_designation": "W 61901", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.51, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 9.8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, bore code 01 follows the 10/12/15/17 mm exception table, so 61901 fits a 12 mm shaft. Envelope 12×24×6 mm (0.472×0.945×0.236 in), C 2.51 kN, C0 1.46 kN, Pu 0.062 kN; limiting speed 40000 r/min and mass 9.8 g. The open W 61901 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61901 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61901 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61901 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61901 is quoted at C 2.51 kN versus the 6 mm-wide 52100 version — do not swap on dimensions alone.", "Assign interference to the rotating ring: on a conventional shaft-mounted 12 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Mount by heating the inner ring (max 120 °C) — driving W61901 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W61901?", "a": "SKF W 61901 measures 12×24×6 mm (0.472×0.945×0.236 in), about 9.8 g, C 2.51 kN." }, { "q": "What does the W in W 61901 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W61901 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W61901?", "a": "The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication." } ], "cross_ref": [ { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×24×6 mm envelope and equivalent catalogue ratings; W 61901-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×24×6 mm envelope and equivalent catalogue ratings; W 61901-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61901", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61901 shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 2.91/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61901-2RS1 shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 2.91/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61901-2Z shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 2.91/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61901 shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 2.89/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61901-2RSR shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 2.89/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61901-2Z shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 2.89/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6901DD shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 3.2/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6901VV shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 3.2/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6901ZZ shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 3.2/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6901 shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 3.2/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6901 shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 3.2/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6901LLU shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 3.2/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6901LLB shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 3.2/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6901ZZ shares the 12×24×6 mm envelope but carries different catalogue ratings (2.51/1.46 kN vs 3.2/1.46 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61901", "W 61901" ], "locale_variants": {} }, { "sku": "W6001-2RS", "brand": "SKF", "manufacturer_designation": "W 6001-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.42, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.102, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 20, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, bore code 01 follows the 10/12/15/17 mm exception table, so 6001 fits a 12 mm shaft. Envelope 12×28×8 mm (0.472×1.102×0.315 in), C 4.42 kN, C0 2.36 kN, Pu 0.102 kN; limiting speed 16000 r/min and mass 20 g. SKF catalogues the sealed execution as W 6001-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W6001-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6001-2RS is quoted at C 4.42 kN versus the 8 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6001-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6001-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Catalogue ratings for W6001-2RS (C 4.42 kN, C0 2.36 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "The fatigue load limit is 0.102 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6001-2RS?", "a": "SKF W 6001-2RS1 measures 12×28×8 mm (0.472×1.102×0.315 in), about 20 g, C 4.42 kN." }, { "q": "What does the W in W 6001-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6001-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6001-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×28×8 mm envelope and equivalent catalogue ratings; W 6001-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "full", "note": "Same 12×28×8 mm envelope and equivalent catalogue ratings; W 6001 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001 shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001-2RSH shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001-2RSL shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001-2Z shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6001-C shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.9/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6001-C-2HRS shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.9/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6001-C-2Z shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.9/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001DDU shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001VV shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001ZZ shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001 shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRX shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRXLLU shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRXLLB shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRXZZ shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6001-2RS", "W 6001-2RS1" ], "locale_variants": {} }, { "sku": "W6001-ZZ", "brand": "SKF", "manufacturer_designation": "W 6001-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.42, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.102, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 20, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, bore code 01 follows the 10/12/15/17 mm exception table, so 6001 fits a 12 mm shaft. Envelope 12×28×8 mm (0.472×1.102×0.315 in), C 4.42 kN, C0 2.36 kN, Pu 0.102 kN; limiting speed 30000 r/min and mass 20 g. SKF spells the double shield W 6001-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6001-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6001-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6001-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6001-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Fillet radii must clear the W6001-ZZ chamfer so the 8 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Catalogue ratings for W6001-ZZ (C 4.42 kN, C0 2.36 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W6001-ZZ?", "a": "SKF W 6001-2Z measures 12×28×8 mm (0.472×1.102×0.315 in), about 20 g, C 4.42 kN." }, { "q": "What does the W in W 6001-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6001-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6001-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×28×8 mm envelope and equivalent catalogue ratings; W 6001-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "full", "note": "Same 12×28×8 mm envelope and equivalent catalogue ratings; W 6001 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001 shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001-2RSH shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001-2RSL shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001-2Z shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6001-C shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.9/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6001-C-2HRS shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.9/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6001-C-2Z shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.9/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001DDU shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001VV shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001ZZ shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001 shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRX shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRXLLU shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRXLLB shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRXZZ shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6001-ZZ", "W 6001-2Z" ], "locale_variants": {} }, { "sku": "W6001", "brand": "SKF", "manufacturer_designation": "W 6001", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.42, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.102, "reference_speed_rpm": 60000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 18, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, bore code 01 follows the 10/12/15/17 mm exception table, so 6001 fits a 12 mm shaft. Envelope 12×28×8 mm (0.472×1.102×0.315 in), C 4.42 kN, C0 2.36 kN, Pu 0.102 kN; limiting speed 36000 r/min and mass 18 g. The open W 6001 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W6001 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6001 is quoted at C 4.42 kN versus the 8 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6001; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6001 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "The fatigue load limit is 0.102 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Assign interference to the rotating ring: on a conventional shaft-mounted 12 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6001?", "a": "SKF W 6001 measures 12×28×8 mm (0.472×1.102×0.315 in), about 18 g, C 4.42 kN." }, { "q": "What does the W in W 6001 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6001?", "a": "The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6001; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×28×8 mm envelope and equivalent catalogue ratings; W 6001-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×28×8 mm envelope and equivalent catalogue ratings; W 6001-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001 shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001-2RSH shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001-2RSL shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6001-2Z shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6001-C shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.9/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6001-C-2HRS shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.9/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6001-C-2Z shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.9/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001DDU shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001VV shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001ZZ shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6001 shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.6/2.37 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRX shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRXLLU shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRXLLB shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6001JRXZZ shares the 12×28×8 mm envelope but carries different catalogue ratings (4.42/2.36 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6001", "W 6001" ], "locale_variants": {} }, { "sku": "W6201-2RS", "brand": "SKF", "manufacturer_designation": "W 6201-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.72, "static_load_kN": 3, "fatigue_load_limit_kN": 0.127, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 36, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, bore code 01 follows the 10/12/15/17 mm exception table, so 6201 fits a 12 mm shaft. Envelope 12×32×10 mm (0.472×1.26×0.394 in), C 5.72 kN, C0 3 kN, Pu 0.127 kN; limiting speed 15000 r/min and mass 36 g. SKF catalogues the sealed execution as W 6201-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6201-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6201-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6201-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6201-2RS is quoted at C 5.72 kN versus the 10 mm-wide 52100 version — do not swap on dimensions alone.", "At 12 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Assign interference to the rotating ring: on a conventional shaft-mounted 12 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6201-2RS?", "a": "SKF W 6201-2RS1 measures 12×32×10 mm (0.472×1.26×0.394 in), about 36 g, C 5.72 kN." }, { "q": "What does the W in W 6201-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6201-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6201-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×32×10 mm envelope and equivalent catalogue ratings; W 6201-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "full", "note": "Same 12×32×10 mm envelope and equivalent catalogue ratings; W 6201 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201 shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201-2Z shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201-2RSH shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201-2RSL shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6201-C shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 8/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6201-C-2HRS shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 8/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6201-C-2Z shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 8/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201DDU shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201VV shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201ZZ shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201 shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201 shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201LLU shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201LLB shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201ZZ shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6201-2RS", "W 6201-2RS1" ], "locale_variants": {} }, { "sku": "W6201-ZZ", "brand": "SKF", "manufacturer_designation": "W 6201-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.72, "static_load_kN": 3, "fatigue_load_limit_kN": 0.127, "reference_speed_rpm": 53000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 36, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, bore code 01 follows the 10/12/15/17 mm exception table, so 6201 fits a 12 mm shaft. Envelope 12×32×10 mm (0.472×1.26×0.394 in), C 5.72 kN, C0 3 kN, Pu 0.127 kN; limiting speed 28000 r/min and mass 36 g. SKF spells the double shield W 6201-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6201-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6201-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6201-ZZ is quoted at C 5.72 kN versus the 10 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6201-ZZ; standard fill is industrial grease unless specified otherwise.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6201-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Fillet radii must clear the W6201-ZZ chamfer so the 10 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6201-ZZ?", "a": "SKF W 6201-2Z measures 12×32×10 mm (0.472×1.26×0.394 in), about 36 g, C 5.72 kN." }, { "q": "What does the W in W 6201-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6201-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6201-ZZ?", "a": "The envelope matches, but stainless rates lower (C 5.72 kN for W 6201-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×32×10 mm envelope and equivalent catalogue ratings; W 6201-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "full", "note": "Same 12×32×10 mm envelope and equivalent catalogue ratings; W 6201 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201 shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201-2Z shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201-2RSH shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201-2RSL shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6201-C shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 8/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6201-C-2HRS shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 8/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6201-C-2Z shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 8/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201DDU shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201VV shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201ZZ shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201 shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201 shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201LLU shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201LLB shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201ZZ shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6201-ZZ", "W 6201-2Z" ], "locale_variants": {} }, { "sku": "W6201", "brand": "SKF", "manufacturer_designation": "W 6201", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.72, "static_load_kN": 3, "fatigue_load_limit_kN": 0.127, "reference_speed_rpm": 53000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 34, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, bore code 01 follows the 10/12/15/17 mm exception table, so 6201 fits a 12 mm shaft. Envelope 12×32×10 mm (0.472×1.26×0.394 in), C 5.72 kN, C0 3 kN, Pu 0.127 kN; limiting speed 34000 r/min and mass 34 g. The open W 6201 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6201 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6201 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6201 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6201 is quoted at C 5.72 kN versus the 10 mm-wide 52100 version — do not swap on dimensions alone.", "Fillet radii must clear the W6201 chamfer so the 10 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Mount by heating the inner ring (max 120 °C) — driving W6201 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W6201?", "a": "SKF W 6201 measures 12×32×10 mm (0.472×1.26×0.394 in), about 34 g, C 5.72 kN." }, { "q": "What does the W in W 6201 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6201; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6201?", "a": "The envelope matches, but stainless rates lower (C 5.72 kN for W 6201); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×32×10 mm envelope and equivalent catalogue ratings; W 6201-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×32×10 mm envelope and equivalent catalogue ratings; W 6201-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201 shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201-2Z shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201-2RSH shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6201-2RSL shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.28/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6201-C shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 8/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6201-C-2HRS shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 8/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6201-C-2Z shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 8/3.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201DDU shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201VV shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201ZZ shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6201 shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 7.5/3.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201 shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201LLU shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201LLB shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6201ZZ shares the 12×32×10 mm envelope but carries different catalogue ratings (5.72/3 kN vs 6.75/2.75 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6201", "W 6201" ], "locale_variants": {} }, { "sku": "W6301-2RS", "brand": "SKF", "manufacturer_designation": "W 6301-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.32, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 58, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, bore code 01 follows the 10/12/15/17 mm exception table, so 6301 fits a 12 mm shaft. Envelope 12×37×12 mm (0.472×1.457×0.472 in), C 8.32 kN, C0 4.15 kN, Pu 0.176 kN; limiting speed 14000 r/min and mass 58 g. SKF catalogues the sealed execution as W 6301-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6301-2RS is quoted at C 8.32 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6301-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6301-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6301-2RS inside the quoted grease temperature range.", "Deep-groove geometry tolerates only minutes of misalignment; if the 37 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6301-2RS.", "The fatigue load limit is 0.176 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6301-2RS?", "a": "SKF W 6301-2RS1 measures 12×37×12 mm (0.472×1.457×0.472 in), about 58 g, C 8.32 kN." }, { "q": "What does the W in W 6301-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6301-2RS?", "a": "The envelope matches, but stainless rates lower (C 8.32 kN for W 6301-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×37×12 mm envelope and equivalent catalogue ratings; W 6301-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "full", "note": "Same 12×37×12 mm envelope and equivalent catalogue ratings; W 6301 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301 shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301-2Z shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301-2RSH shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301-2RSL shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6301-C shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 11.5/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6301-C-2HRS shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 11.5/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6301-C-2Z shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 11.5/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301DDU shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301VV shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301ZZ shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301 shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301 shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301LLU shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301LLB shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301ZZ shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6301-2RS", "W 6301-2RS1" ], "locale_variants": {} }, { "sku": "W6301-ZZ", "brand": "SKF", "manufacturer_designation": "W 6301-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.32, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 48000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 60, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, bore code 01 follows the 10/12/15/17 mm exception table, so 6301 fits a 12 mm shaft. Envelope 12×37×12 mm (0.472×1.457×0.472 in), C 8.32 kN, C0 4.15 kN, Pu 0.176 kN; limiting speed 24000 r/min and mass 60 g. SKF spells the double shield W 6301-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6301-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6301-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6301-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6301-ZZ is not marine-grade stainless.", "Assign interference to the rotating ring: on a conventional shaft-mounted 12 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Deep-groove geometry tolerates only minutes of misalignment; if the 37 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6301-ZZ." ], "faq": [ { "q": "What are the dimensions of the stainless W6301-ZZ?", "a": "SKF W 6301-2Z measures 12×37×12 mm (0.472×1.457×0.472 in), about 60 g, C 8.32 kN." }, { "q": "What does the W in W 6301-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6301-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×37×12 mm envelope and equivalent catalogue ratings; W 6301-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "full", "note": "Same 12×37×12 mm envelope and equivalent catalogue ratings; W 6301 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301 shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301-2Z shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301-2RSH shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301-2RSL shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6301-C shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 11.5/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6301-C-2HRS shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 11.5/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6301-C-2Z shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 11.5/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301DDU shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301VV shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301ZZ shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301 shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301 shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301LLU shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301LLB shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301ZZ shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6301-ZZ", "W 6301-2Z" ], "locale_variants": {} }, { "sku": "W6301", "brand": "SKF", "manufacturer_designation": "W 6301", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.32, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 48000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 56, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, bore code 01 follows the 10/12/15/17 mm exception table, so 6301 fits a 12 mm shaft. Envelope 12×37×12 mm (0.472×1.457×0.472 in), C 8.32 kN, C0 4.15 kN, Pu 0.176 kN; limiting speed 30000 r/min and mass 56 g. The open W 6301 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6301 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6301 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6301 is quoted at C 8.32 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6301; standard fill is industrial grease unless specified otherwise.", "Catalogue ratings for W6301 (C 8.32 kN, C0 4.15 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6301-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W6301?", "a": "SKF W 6301 measures 12×37×12 mm (0.472×1.457×0.472 in), about 56 g, C 8.32 kN." }, { "q": "What does the W in W 6301 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6301?", "a": "The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6301; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×37×12 mm envelope and equivalent catalogue ratings; W 6301-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×37×12 mm envelope and equivalent catalogue ratings; W 6301-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301 shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301-2Z shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301-2RSH shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6301-2RSL shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.1/4.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6301-C shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 11.5/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6301-C-2HRS shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 11.5/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6301-C-2Z shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 11.5/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301DDU shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301VV shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301ZZ shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6301 shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.7/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301 shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301LLU shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301LLB shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6301ZZ shares the 12×37×12 mm envelope but carries different catalogue ratings (8.32/4.15 kN vs 10.8/4.2 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6301", "W 6301" ], "locale_variants": {} }, { "sku": "W61802-2RS", "brand": "SKF", "manufacturer_designation": "W 61802-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.65, "static_load_kN": 1.08, "fatigue_load_limit_kN": 0.048, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 7.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, bore code 02 follows the 10/12/15/17 mm exception table, so 61802 fits a 15 mm shaft. Envelope 15×24×5 mm (0.591×0.945×0.197 in), C 1.65 kN, C0 1.08 kN, Pu 0.048 kN; limiting speed 17000 r/min and mass 7.1 g. SKF catalogues the sealed execution as W 61802-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W61802-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61802-2RS is quoted at C 1.65 kN versus the 5 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61802-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61802-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 61802-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Mount by heating the inner ring (max 120 °C) — driving W61802-2RS home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W61802-2RS?", "a": "SKF W 61802-2RS1 measures 15×24×5 mm (0.591×0.945×0.197 in), about 7.1 g, C 1.65 kN." }, { "q": "What does the W in W 61802-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W61802-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W61802-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×24×5 mm envelope and equivalent catalogue ratings; W 61802-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61802", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61802 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 1.9/1.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61802-2RS1 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 1.9/1.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61802-2Z shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 1.9/1.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61802 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.07/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61802-2RSR shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.07/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61802-2Z shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.07/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6802DD shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.28/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6802VV shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.28/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6802ZZ shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.28/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6802 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.28/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6802 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.3/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6802LLU shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.3/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6802LLB shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.3/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6802ZZ shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.3/1.26 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61802-2RS", "W 61802-2RS1" ], "locale_variants": {} }, { "sku": "W61802-ZZ", "brand": "SKF", "manufacturer_designation": "W 61802-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.65, "static_load_kN": 1.08, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 6.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, bore code 02 follows the 10/12/15/17 mm exception table, so 61802 fits a 15 mm shaft. Envelope 15×24×5 mm (0.591×0.945×0.197 in), C 1.65 kN, C0 1.08 kN, Pu 0.048 kN; limiting speed 30000 r/min and mass 6.7 g. SKF spells the double shield W 61802-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61802-ZZ is quoted at C 1.65 kN versus the 5 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61802-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61802-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61802-ZZ inside the quoted grease temperature range.", "Fillet radii must clear the W61802-ZZ chamfer so the 5 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Fillet radii must clear the W61802-ZZ chamfer so the 5 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W61802-ZZ?", "a": "SKF W 61802-2Z measures 15×24×5 mm (0.591×0.945×0.197 in), about 6.7 g, C 1.65 kN." }, { "q": "What does the W in W 61802-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W61802-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×24×5 mm envelope and equivalent catalogue ratings; W 61802-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61802", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61802 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 1.9/1.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61802-2RS1 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 1.9/1.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61802-2Z shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 1.9/1.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61802 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.07/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61802-2RSR shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.07/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61802-2Z shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.07/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6802DD shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.28/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6802VV shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.28/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6802ZZ shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.28/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6802 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.28/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6802 shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.3/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6802LLU shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.3/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6802LLB shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.3/1.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6802ZZ shares the 15×24×5 mm envelope but carries different catalogue ratings (1.65/1.08 kN vs 2.3/1.26 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61802-ZZ", "W 61802-2Z" ], "locale_variants": {} }, { "sku": "W61902-2RS", "brand": "SKF", "manufacturer_designation": "W 61902-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.71, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 16, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, bore code 02 follows the 10/12/15/17 mm exception table, so 61902 fits a 15 mm shaft. Envelope 15×28×7 mm (0.591×1.102×0.276 in), C 3.71 kN, C0 2.24 kN, Pu 0.095 kN; limiting speed 16000 r/min and mass 16 g. SKF catalogues the sealed execution as W 61902-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61902-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61902-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61902-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61902-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Deep-groove geometry tolerates only minutes of misalignment; if the 28 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61902-2RS.", "The fatigue load limit is 0.095 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W61902-2RS?", "a": "SKF W 61902-2RS1 measures 15×28×7 mm (0.591×1.102×0.276 in), about 16 g, C 3.71 kN." }, { "q": "What does the W in W 61902-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W61902-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W61902-2RS?", "a": "The envelope matches, but stainless rates lower (C 3.71 kN for W 61902-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×28×7 mm envelope and equivalent catalogue ratings; W 61902-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "full", "note": "Same 15×28×7 mm envelope and equivalent catalogue ratings; W 61902 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902-2RS1 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902-2RZ shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902-2Z shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.33/2.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61902-2RSR shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.33/2.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61902-2Z shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.33/2.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902DD shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902VV shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902ZZ shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902LLU shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902LLB shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902ZZ shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61902-2RS", "W 61902-2RS1" ], "locale_variants": {} }, { "sku": "W61902-ZZ", "brand": "SKF", "manufacturer_designation": "W 61902-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.71, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 16, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, bore code 02 follows the 10/12/15/17 mm exception table, so 61902 fits a 15 mm shaft. Envelope 15×28×7 mm (0.591×1.102×0.276 in), C 3.71 kN, C0 2.24 kN, Pu 0.095 kN; limiting speed 28000 r/min and mass 16 g. SKF spells the double shield W 61902-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61902-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61902-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61902-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61902-ZZ is not marine-grade stainless.", "The fatigue load limit is 0.095 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Do not preload W61902-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of the stainless W61902-ZZ?", "a": "SKF W 61902-2Z measures 15×28×7 mm (0.591×1.102×0.276 in), about 16 g, C 3.71 kN." }, { "q": "What does the W in W 61902-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61902-ZZ?", "a": "The envelope matches, but stainless rates lower (C 3.71 kN for W 61902-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×28×7 mm envelope and equivalent catalogue ratings; W 61902-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "full", "note": "Same 15×28×7 mm envelope and equivalent catalogue ratings; W 61902 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902-2RS1 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902-2RZ shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902-2Z shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.33/2.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61902-2RSR shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.33/2.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61902-2Z shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.33/2.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902DD shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902VV shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902ZZ shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902LLU shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902LLB shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902ZZ shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61902-ZZ", "W 61902-2Z" ], "locale_variants": {} }, { "sku": "W61902", "brand": "SKF", "manufacturer_designation": "W 61902", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.71, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 14, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, bore code 02 follows the 10/12/15/17 mm exception table, so 61902 fits a 15 mm shaft. Envelope 15×28×7 mm (0.591×1.102×0.276 in), C 3.71 kN, C0 2.24 kN, Pu 0.095 kN; limiting speed 34000 r/min and mass 14 g. The open W 61902 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61902 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61902 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61902 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61902 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Deep-groove geometry tolerates only minutes of misalignment; if the 28 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61902.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 61902-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W61902?", "a": "SKF W 61902 measures 15×28×7 mm (0.591×1.102×0.276 in), about 14 g, C 3.71 kN." }, { "q": "What does the W in W 61902 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W61902; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W61902?", "a": "The envelope matches, but stainless rates lower (C 3.71 kN for W 61902); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×28×7 mm envelope and equivalent catalogue ratings; W 61902-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×28×7 mm envelope and equivalent catalogue ratings; W 61902-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902-2RS1 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902-2RZ shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61902-2Z shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.36/2.24 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.33/2.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61902-2RSR shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.33/2.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61902-2Z shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.33/2.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902DD shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902VV shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902ZZ shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.75/2.26 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902 shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902LLU shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902LLB shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6902ZZ shares the 15×28×7 mm envelope but carries different catalogue ratings (3.71/2.24 kN vs 4.05/2 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61902", "W 61902" ], "locale_variants": {} }, { "sku": "W6002-2RS", "brand": "SKF", "manufacturer_designation": "W 6002-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.88, "static_load_kN": 2.8, "fatigue_load_limit_kN": 0.12, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 28, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, bore code 02 follows the 10/12/15/17 mm exception table, so 6002 fits a 15 mm shaft. Envelope 15×32×9 mm (0.591×1.26×0.354 in), C 4.88 kN, C0 2.8 kN, Pu 0.12 kN; limiting speed 14000 r/min and mass 28 g. SKF catalogues the sealed execution as W 6002-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6002-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6002-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6002-2RS is quoted at C 4.88 kN versus the 9 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6002-2RS; standard fill is industrial grease unless specified otherwise.", "Fillet radii must clear the W6002-2RS chamfer so the 9 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload W6002-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of the stainless W6002-2RS?", "a": "SKF W 6002-2RS1 measures 15×32×9 mm (0.591×1.26×0.354 in), about 28 g, C 4.88 kN." }, { "q": "What does the W in W 6002-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6002-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6002-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×9 mm envelope and equivalent catalogue ratings; W 6002-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×9 mm envelope and equivalent catalogue ratings; W 6002 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002 shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002-2RSH shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002-2RSL shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002-2Z shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6002-C shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.3/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6002-C-2HRS shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.3/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6002-C-2Z shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.3/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002DDU shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002VV shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002ZZ shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002 shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002 shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002LLU shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002LLB shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002ZZ shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6002-2RS", "W 6002-2RS1" ], "locale_variants": {} }, { "sku": "W6002-ZZ", "brand": "SKF", "manufacturer_designation": "W 6002-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.88, "static_load_kN": 2.8, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 29, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, bore code 02 follows the 10/12/15/17 mm exception table, so 6002 fits a 15 mm shaft. Envelope 15×32×9 mm (0.591×1.26×0.354 in), C 4.88 kN, C0 2.8 kN, Pu 0.12 kN; limiting speed 26000 r/min and mass 29 g. SKF spells the double shield W 6002-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6002-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6002-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6002-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6002-ZZ is quoted at C 4.88 kN versus the 9 mm-wide 52100 version — do not swap on dimensions alone.", "Fillet radii must clear the W6002-ZZ chamfer so the 9 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Mount by heating the inner ring (max 120 °C) — driving W6002-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W6002-ZZ?", "a": "SKF W 6002-2Z measures 15×32×9 mm (0.591×1.26×0.354 in), about 29 g, C 4.88 kN." }, { "q": "What does the W in W 6002-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6002-ZZ?", "a": "The envelope matches, but stainless rates lower (C 4.88 kN for W 6002-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×9 mm envelope and equivalent catalogue ratings; W 6002-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×9 mm envelope and equivalent catalogue ratings; W 6002 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002 shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002-2RSH shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002-2RSL shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002-2Z shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6002-C shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.3/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6002-C-2HRS shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.3/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6002-C-2Z shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.3/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002DDU shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002VV shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002ZZ shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002 shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002 shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002LLU shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002LLB shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002ZZ shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6002-ZZ", "W 6002-2Z" ], "locale_variants": {} }, { "sku": "W6002", "brand": "SKF", "manufacturer_designation": "W 6002", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.88, "static_load_kN": 2.8, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 26, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, bore code 02 follows the 10/12/15/17 mm exception table, so 6002 fits a 15 mm shaft. Envelope 15×32×9 mm (0.591×1.26×0.354 in), C 4.88 kN, C0 2.8 kN, Pu 0.12 kN; limiting speed 32000 r/min and mass 26 g. The open W 6002 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6002 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6002 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6002 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6002 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Fillet radii must clear the W6002 chamfer so the 9 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Mount by heating the inner ring (max 120 °C) — driving W6002 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W6002?", "a": "SKF W 6002 measures 15×32×9 mm (0.591×1.26×0.354 in), about 26 g, C 4.88 kN." }, { "q": "What does the W in W 6002 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6002?", "a": "The envelope matches, but stainless rates lower (C 4.88 kN for W 6002); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×9 mm envelope and equivalent catalogue ratings; W 6002-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×9 mm envelope and equivalent catalogue ratings; W 6002-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002 shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002-2RSH shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002-2RSL shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6002-2Z shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 5.85/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6002-C shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.3/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6002-C-2HRS shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.3/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6002-C-2Z shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.3/2.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002DDU shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002VV shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002ZZ shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6002 shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.15/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002 shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002LLU shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002LLB shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6002ZZ shares the 15×32×9 mm envelope but carries different catalogue ratings (4.88/2.8 kN vs 6.2/2.84 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6002", "W 6002" ], "locale_variants": {} }, { "sku": "W6202-2RS", "brand": "SKF", "manufacturer_designation": "W 6202-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.6, "fatigue_load_limit_kN": 0.156, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 44, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, bore code 02 follows the 10/12/15/17 mm exception table, so 6202 fits a 15 mm shaft. Envelope 15×35×11 mm (0.591×1.378×0.433 in), C 6.37 kN, C0 3.6 kN, Pu 0.156 kN; limiting speed 13000 r/min and mass 44 g. SKF catalogues the sealed execution as W 6202-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6202-2RS is quoted at C 6.37 kN versus the 11 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6202-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6202-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6202-2RS inside the quoted grease temperature range.", "Assign interference to the rotating ring: on a conventional shaft-mounted 15 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6202-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W6202-2RS?", "a": "SKF W 6202-2RS1 measures 15×35×11 mm (0.591×1.378×0.433 in), about 44 g, C 6.37 kN." }, { "q": "What does the W in W 6202-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6202-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×35×11 mm envelope and equivalent catalogue ratings; W 6202-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "full", "note": "Same 15×35×11 mm envelope and equivalent catalogue ratings; W 6202 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202 shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202-2Z shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202-2RSH shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202-2RSL shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6202-C shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.9/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6202-C-2HRS shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.9/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6202-C-2Z shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.9/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202DDU shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202VV shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202ZZ shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202 shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202 shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202LLU shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202LLB shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202ZZ shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6202-2RS", "W 6202-2RS1" ], "locale_variants": {} }, { "sku": "W6202-ZZ", "brand": "SKF", "manufacturer_designation": "W 6202-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.6, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 48000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 44, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, bore code 02 follows the 10/12/15/17 mm exception table, so 6202 fits a 15 mm shaft. Envelope 15×35×11 mm (0.591×1.378×0.433 in), C 6.37 kN, C0 3.6 kN, Pu 0.156 kN; limiting speed 24000 r/min and mass 44 g. SKF spells the double shield W 6202-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6202-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6202-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6202-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6202-ZZ is not marine-grade stainless.", "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of the stainless W6202-ZZ?", "a": "SKF W 6202-2Z measures 15×35×11 mm (0.591×1.378×0.433 in), about 44 g, C 6.37 kN." }, { "q": "What does the W in W 6202-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6202-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6202-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×35×11 mm envelope and equivalent catalogue ratings; W 6202-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "full", "note": "Same 15×35×11 mm envelope and equivalent catalogue ratings; W 6202 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202 shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202-2Z shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202-2RSH shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202-2RSL shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6202-C shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.9/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6202-C-2HRS shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.9/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6202-C-2Z shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.9/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202DDU shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202VV shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202ZZ shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202 shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202 shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202LLU shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202LLB shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202ZZ shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6202-ZZ", "W 6202-2Z" ], "locale_variants": {} }, { "sku": "W6202", "brand": "SKF", "manufacturer_designation": "W 6202", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.6, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 48000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 42, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, bore code 02 follows the 10/12/15/17 mm exception table, so 6202 fits a 15 mm shaft. Envelope 15×35×11 mm (0.591×1.378×0.433 in), C 6.37 kN, C0 3.6 kN, Pu 0.156 kN; limiting speed 30000 r/min and mass 42 g. The open W 6202 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6202 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6202 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6202 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6202 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Catalogue ratings for W6202 (C 6.37 kN, C0 3.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "The fatigue load limit is 0.156 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6202?", "a": "SKF W 6202 measures 15×35×11 mm (0.591×1.378×0.433 in), about 42 g, C 6.37 kN." }, { "q": "What does the W in W 6202 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6202?", "a": "The envelope matches, but stainless rates lower (C 6.37 kN for W 6202); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×35×11 mm envelope and equivalent catalogue ratings; W 6202-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×35×11 mm envelope and equivalent catalogue ratings; W 6202-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202 shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202-2Z shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202-2RSH shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6202-2RSL shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.06/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6202-C shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.9/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6202-C-2HRS shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.9/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6202-C-2Z shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.9/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202DDU shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202VV shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202ZZ shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6202 shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.4/3.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202 shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202LLU shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202LLB shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6202ZZ shares the 15×35×11 mm envelope but carries different catalogue ratings (6.37/3.6 kN vs 8.6/3.6 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6202", "W 6202" ], "locale_variants": {} }, { "sku": "W6302-2RS", "brand": "SKF", "manufacturer_designation": "W 6302-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.232, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 81, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, bore code 02 follows the 10/12/15/17 mm exception table, so 6302 fits a 15 mm shaft. Envelope 15×42×13 mm (0.591×1.654×0.512 in), C 9.95 kN, C0 5.4 kN, Pu 0.232 kN; limiting speed 11000 r/min and mass 81 g. SKF catalogues the sealed execution as W 6302-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6302-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6302-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6302-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6302-2RS is not marine-grade stainless.", "Assign interference to the rotating ring: on a conventional shaft-mounted 15 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of the stainless W6302-2RS?", "a": "SKF W 6302-2RS1 measures 15×42×13 mm (0.591×1.654×0.512 in), about 81 g, C 9.95 kN." }, { "q": "What does the W in W 6302-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6302-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6302-2RS?", "a": "The envelope matches, but stainless rates lower (C 9.95 kN for W 6302-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×42×13 mm envelope and equivalent catalogue ratings; W 6302-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "full", "note": "Same 15×42×13 mm envelope and equivalent catalogue ratings; W 6302 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302 shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302-2Z shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302-2RSH shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302-2RSL shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6302-C shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 13.3/5.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6302-C-2HRS shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 13.3/5.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6302-C-2Z shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 13.3/5.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302DDU shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302VV shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302ZZ shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302 shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302 shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302LLU shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302LLB shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302ZZ shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6302-2RS", "W 6302-2RS1" ], "locale_variants": {} }, { "sku": "W6302-ZZ", "brand": "SKF", "manufacturer_designation": "W 6302-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.232, "reference_speed_rpm": 40000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 82, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, bore code 02 follows the 10/12/15/17 mm exception table, so 6302 fits a 15 mm shaft. Envelope 15×42×13 mm (0.591×1.654×0.512 in), C 9.95 kN, C0 5.4 kN, Pu 0.232 kN; limiting speed 20000 r/min and mass 82 g. SKF spells the double shield W 6302-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6302-ZZ is quoted at C 9.95 kN versus the 13 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6302-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6302-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6302-ZZ inside the quoted grease temperature range.", "The fatigue load limit is 0.232 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The fatigue load limit is 0.232 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6302-ZZ?", "a": "SKF W 6302-2Z measures 15×42×13 mm (0.591×1.654×0.512 in), about 82 g, C 9.95 kN." }, { "q": "What does the W in W 6302-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6302-ZZ?", "a": "The envelope matches, but stainless rates lower (C 9.95 kN for W 6302-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×42×13 mm envelope and equivalent catalogue ratings; W 6302-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "full", "note": "Same 15×42×13 mm envelope and equivalent catalogue ratings; W 6302 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302 shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302-2Z shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302-2RSH shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302-2RSL shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6302-C shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 13.3/5.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6302-C-2HRS shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 13.3/5.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6302-C-2Z shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 13.3/5.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302DDU shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302VV shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302ZZ shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302 shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302 shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302LLU shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302LLB shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302ZZ shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6302-ZZ", "W 6302-2Z" ], "locale_variants": {} }, { "sku": "W6302", "brand": "SKF", "manufacturer_designation": "W 6302", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.232, "reference_speed_rpm": 40000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 77, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, bore code 02 follows the 10/12/15/17 mm exception table, so 6302 fits a 15 mm shaft. Envelope 15×42×13 mm (0.591×1.654×0.512 in), C 9.95 kN, C0 5.4 kN, Pu 0.232 kN; limiting speed 26000 r/min and mass 77 g. The open W 6302 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6302; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6302 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6302 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6302 is not marine-grade stainless.", "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Mount by heating the inner ring (max 120 °C) — driving W6302 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W6302?", "a": "SKF W 6302 measures 15×42×13 mm (0.591×1.654×0.512 in), about 77 g, C 9.95 kN." }, { "q": "What does the W in W 6302 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6302 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×42×13 mm envelope and equivalent catalogue ratings; W 6302-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×42×13 mm envelope and equivalent catalogue ratings; W 6302-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302 shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302-2Z shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302-2RSH shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6302-2RSL shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 11.9/5.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6302-C shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 13.3/5.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6302-C-2HRS shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 13.3/5.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6302-C-2Z shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 13.3/5.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302DDU shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302VV shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302ZZ shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6302 shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.6/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302 shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302LLU shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302LLB shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6302ZZ shares the 15×42×13 mm envelope but carries different catalogue ratings (9.95/5.4 kN vs 12.7/5.45 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6302", "W 6302" ], "locale_variants": {} }, { "sku": "W61803-2RS", "brand": "SKF", "manufacturer_designation": "W 61803-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.78, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, bore code 03 follows the 10/12/15/17 mm exception table, so 61803 fits a 17 mm shaft. Envelope 17×26×5 mm (0.669×1.024×0.197 in), C 1.78 kN, C0 1.27 kN, Pu 0.054 kN; limiting speed 16000 r/min and mass 8 g. SKF catalogues the sealed execution as W 61803-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61803-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61803-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61803-2RS is quoted at C 1.78 kN versus the 5 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61803-2RS; standard fill is industrial grease unless specified otherwise.", "Fillet radii must clear the W61803-2RS chamfer so the 5 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload W61803-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of the stainless W61803-2RS?", "a": "SKF W 61803-2RS1 measures 17×26×5 mm (0.669×1.024×0.197 in), about 8 g, C 1.78 kN." }, { "q": "What does the W in W 61803-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61803-2RS?", "a": "The envelope matches, but stainless rates lower (C 1.78 kN for W 61803-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×26×5 mm envelope and equivalent catalogue ratings; W 61803-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61803", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61803 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.03/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61803-2RS1 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.03/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61803-2RZ shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.03/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61803-2Z shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.03/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61803 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.23/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61803-2RSR shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.23/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61803-2Z shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.23/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6803DD shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.89/1.57 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6803VV shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.89/1.57 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6803ZZ shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.89/1.57 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6803 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.89/1.57 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6803 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.47/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6803LLU shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.47/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6803LLB shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.47/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6803ZZ shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.47/1.46 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61803-2RS", "W 61803-2RS1" ], "locale_variants": {} }, { "sku": "W61803-ZZ", "brand": "SKF", "manufacturer_designation": "W 61803-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.78, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 7.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, bore code 03 follows the 10/12/15/17 mm exception table, so 61803 fits a 17 mm shaft. Envelope 17×26×5 mm (0.669×1.024×0.197 in), C 1.78 kN, C0 1.27 kN, Pu 0.054 kN; limiting speed 28000 r/min and mass 7.6 g. SKF spells the double shield W 61803-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61803-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61803-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61803-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61803-ZZ is not marine-grade stainless.", "Fillet radii must clear the W61803-ZZ chamfer so the 5 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Fillet radii must clear the W61803-ZZ chamfer so the 5 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W61803-ZZ?", "a": "SKF W 61803-2Z measures 17×26×5 mm (0.669×1.024×0.197 in), about 7.6 g, C 1.78 kN." }, { "q": "What does the W in W 61803-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W61803-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W61803-ZZ?", "a": "The envelope matches, but stainless rates lower (C 1.78 kN for W 61803-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×26×5 mm envelope and equivalent catalogue ratings; W 61803-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61803", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61803 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.03/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61803-2RS1 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.03/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61803-2RZ shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.03/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61803-2Z shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.03/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61803 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.23/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61803-2RSR shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.23/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61803-2Z shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.23/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6803DD shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.89/1.57 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6803VV shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.89/1.57 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6803ZZ shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.89/1.57 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6803 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.89/1.57 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6803 shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.47/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6803LLU shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.47/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6803LLB shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.47/1.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6803ZZ shares the 17×26×5 mm envelope but carries different catalogue ratings (1.78/1.27 kN vs 2.47/1.46 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61803-ZZ", "W 61803-2Z" ], "locale_variants": {} }, { "sku": "W61903-2RS", "brand": "SKF", "manufacturer_designation": "W 61903-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.97, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 16, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, bore code 03 follows the 10/12/15/17 mm exception table, so 61903 fits a 17 mm shaft. Envelope 17×30×7 mm (0.669×1.181×0.276 in), C 3.97 kN, C0 2.55 kN, Pu 0.108 kN; limiting speed 14000 r/min and mass 16 g. SKF catalogues the sealed execution as W 61903-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61903-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61903-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61903-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61903-2RS is quoted at C 3.97 kN versus the 7 mm-wide 52100 version — do not swap on dimensions alone.", "Deep-groove geometry tolerates only minutes of misalignment; if the 30 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61903-2RS.", "Fillet radii must clear the W61903-2RS chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W61903-2RS?", "a": "SKF W 61903-2RS1 measures 17×30×7 mm (0.669×1.181×0.276 in), about 16 g, C 3.97 kN." }, { "q": "What does the W in W 61903-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W61903-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×30×7 mm envelope and equivalent catalogue ratings; W 61903-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "full", "note": "Same 17×30×7 mm envelope and equivalent catalogue ratings; W 61903 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903-2RS1 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903-2RZ shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903-2Z shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61903 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.59/2.56 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61903-2RSR shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.59/2.56 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61903-2Z shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.59/2.56 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903DDU shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903VV shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903ZZ shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRX shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRXLLU shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRXLLB shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRXZZ shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61903-2RS", "W 61903-2RS1" ], "locale_variants": {} }, { "sku": "W61903-ZZ", "brand": "SKF", "manufacturer_designation": "W 61903-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.97, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 17, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, bore code 03 follows the 10/12/15/17 mm exception table, so 61903 fits a 17 mm shaft. Envelope 17×30×7 mm (0.669×1.181×0.276 in), C 3.97 kN, C0 2.55 kN, Pu 0.108 kN; limiting speed 24000 r/min and mass 17 g. SKF spells the double shield W 61903-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61903-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61903-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61903-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61903-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Catalogue ratings for W61903-ZZ (C 3.97 kN, C0 2.55 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Catalogue ratings for W61903-ZZ (C 3.97 kN, C0 2.55 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W61903-ZZ?", "a": "SKF W 61903-2Z measures 17×30×7 mm (0.669×1.181×0.276 in), about 17 g, C 3.97 kN." }, { "q": "What does the W in W 61903-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W61903-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×30×7 mm envelope and equivalent catalogue ratings; W 61903-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "full", "note": "Same 17×30×7 mm envelope and equivalent catalogue ratings; W 61903 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903-2RS1 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903-2RZ shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903-2Z shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61903 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.59/2.56 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61903-2RSR shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.59/2.56 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61903-2Z shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.59/2.56 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903DDU shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903VV shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903ZZ shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRX shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRXLLU shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRXLLB shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRXZZ shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61903-ZZ", "W 61903-2Z" ], "locale_variants": {} }, { "sku": "W61903", "brand": "SKF", "manufacturer_designation": "W 61903", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.97, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 16, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, bore code 03 follows the 10/12/15/17 mm exception table, so 61903 fits a 17 mm shaft. Envelope 17×30×7 mm (0.669×1.181×0.276 in), C 3.97 kN, C0 2.55 kN, Pu 0.108 kN; limiting speed 32000 r/min and mass 16 g. The open W 61903 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61903; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61903 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61903 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61903 is not marine-grade stainless.", "Do not preload W61903 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "At 17 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of the stainless W61903?", "a": "SKF W 61903 measures 17×30×7 mm (0.669×1.181×0.276 in), about 16 g, C 3.97 kN." }, { "q": "What does the W in W 61903 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61903?", "a": "The envelope matches, but stainless rates lower (C 3.97 kN for W 61903); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×30×7 mm envelope and equivalent catalogue ratings; W 61903-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×30×7 mm envelope and equivalent catalogue ratings; W 61903-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903-2RS1 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903-2RZ shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61903-2Z shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.62/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61903 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.59/2.56 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61903-2RSR shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.59/2.56 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61903-2Z shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 4.59/2.56 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903DDU shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903VV shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903ZZ shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6903 shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.05/2.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRX shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRXLLU shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRXLLB shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6903JRXZZ shares the 17×30×7 mm envelope but carries different catalogue ratings (3.97/2.55 kN vs 5.15/2.58 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61903", "W 61903" ], "locale_variants": {} }, { "sku": "W6003-2RS", "brand": "SKF", "manufacturer_designation": "W 6003-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.94, "static_load_kN": 3.15, "fatigue_load_limit_kN": 0.137, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 38, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, bore code 03 follows the 10/12/15/17 mm exception table, so 6003 fits a 17 mm shaft. Envelope 17×35×10 mm (0.669×1.378×0.394 in), C 4.94 kN, C0 3.15 kN, Pu 0.137 kN; limiting speed 13000 r/min and mass 38 g. SKF catalogues the sealed execution as W 6003-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6003-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6003-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6003-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6003-2RS is not marine-grade stainless.", "The fatigue load limit is 0.137 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Catalogue ratings for W6003-2RS (C 4.94 kN, C0 3.15 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W6003-2RS?", "a": "SKF W 6003-2RS1 measures 17×35×10 mm (0.669×1.378×0.394 in), about 38 g, C 4.94 kN." }, { "q": "What does the W in W 6003-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6003-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×10 mm envelope and equivalent catalogue ratings; W 6003-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×10 mm envelope and equivalent catalogue ratings; W 6003 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003 shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003-2RSH shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003-2RSL shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003-2Z shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6003 shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.4/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6003-2RSR shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.4/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6003-2Z shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.4/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003DDU shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003VV shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003ZZ shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003 shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6003-2RS", "W 6003-2RS1" ], "locale_variants": {} }, { "sku": "W6003-ZZ", "brand": "SKF", "manufacturer_designation": "W 6003-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.94, "static_load_kN": 3.15, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 38, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, bore code 03 follows the 10/12/15/17 mm exception table, so 6003 fits a 17 mm shaft. Envelope 17×35×10 mm (0.669×1.378×0.394 in), C 4.94 kN, C0 3.15 kN, Pu 0.137 kN; limiting speed 22000 r/min and mass 38 g. SKF spells the double shield W 6003-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6003-ZZ is quoted at C 4.94 kN versus the 10 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6003-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6003-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6003-ZZ inside the quoted grease temperature range.", "Do not preload W6003-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Do not preload W6003-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of the stainless W6003-ZZ?", "a": "SKF W 6003-2Z measures 17×35×10 mm (0.669×1.378×0.394 in), about 38 g, C 4.94 kN." }, { "q": "What does the W in W 6003-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6003-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6003-ZZ?", "a": "The envelope matches, but stainless rates lower (C 4.94 kN for W 6003-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×10 mm envelope and equivalent catalogue ratings; W 6003-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×10 mm envelope and equivalent catalogue ratings; W 6003 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003 shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003-2RSH shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003-2RSL shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003-2Z shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6003 shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.4/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6003-2RSR shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.4/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6003-2Z shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.4/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003DDU shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003VV shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003ZZ shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003 shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6003-ZZ", "W 6003-2Z" ], "locale_variants": {} }, { "sku": "W6003", "brand": "SKF", "manufacturer_designation": "W 6003", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.94, "static_load_kN": 3.15, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 36, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, bore code 03 follows the 10/12/15/17 mm exception table, so 6003 fits a 17 mm shaft. Envelope 17×35×10 mm (0.669×1.378×0.394 in), C 4.94 kN, C0 3.15 kN, Pu 0.137 kN; limiting speed 28000 r/min and mass 36 g. The open W 6003 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6003; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6003 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6003 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6003 is not marine-grade stainless.", "Assign interference to the rotating ring: on a conventional shaft-mounted 17 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "The fatigue load limit is 0.137 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6003?", "a": "SKF W 6003 measures 17×35×10 mm (0.669×1.378×0.394 in), about 36 g, C 4.94 kN." }, { "q": "What does the W in W 6003 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6003 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×10 mm envelope and equivalent catalogue ratings; W 6003-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×10 mm envelope and equivalent catalogue ratings; W 6003-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003 shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003-2RSH shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003-2RSL shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6003-2Z shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.37/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6003 shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.4/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6003-2RSR shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.4/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6003-2Z shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.4/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003DDU shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003VV shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003ZZ shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6003 shares the 17×35×10 mm envelope but carries different catalogue ratings (4.94/3.15 kN vs 6.6/3.25 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6003", "W 6003" ], "locale_variants": {} }, { "sku": "W6203-2RS", "brand": "SKF", "manufacturer_designation": "W 6203-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 64, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, bore code 03 follows the 10/12/15/17 mm exception table, so 6203 fits a 17 mm shaft. Envelope 17×40×12 mm (0.669×1.575×0.472 in), C 8.06 kN, C0 4.75 kN, Pu 0.2 kN; limiting speed 12000 r/min and mass 64 g. SKF catalogues the sealed execution as W 6203-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W6203-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6203-2RS is quoted at C 8.06 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6203-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6203-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Fillet radii must clear the W6203-2RS chamfer so the 12 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Catalogue ratings for W6203-2RS (C 8.06 kN, C0 4.75 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W6203-2RS?", "a": "SKF W 6203-2RS1 measures 17×40×12 mm (0.669×1.575×0.472 in), about 64 g, C 8.06 kN." }, { "q": "What does the W in W 6203-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6203-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6203-2RS?", "a": "The envelope matches, but stainless rates lower (C 8.06 kN for W 6203-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×40×12 mm envelope and equivalent catalogue ratings; W 6203-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "full", "note": "Same 17×40×12 mm envelope and equivalent catalogue ratings; W 6203 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203 shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203-2Z shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203-2RSH shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203-2RSL shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6203-C shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 11/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6203-C-2HRS shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 11/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6203-C-2Z shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 11/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203DDU shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203VV shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203ZZ shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203 shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203 shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203LLU shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203LLB shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203ZZ shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6203-2RS", "W 6203-2RS1" ], "locale_variants": {} }, { "sku": "W6203-ZZ", "brand": "SKF", "manufacturer_designation": "W 6203-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 40000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 66, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, bore code 03 follows the 10/12/15/17 mm exception table, so 6203 fits a 17 mm shaft. Envelope 17×40×12 mm (0.669×1.575×0.472 in), C 8.06 kN, C0 4.75 kN, Pu 0.2 kN; limiting speed 20000 r/min and mass 66 g. SKF spells the double shield W 6203-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6203-ZZ is quoted at C 8.06 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6203-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6203-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6203-ZZ inside the quoted grease temperature range.", "Assign interference to the rotating ring: on a conventional shaft-mounted 17 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "The fatigue load limit is 0.2 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6203-ZZ?", "a": "SKF W 6203-2Z measures 17×40×12 mm (0.669×1.575×0.472 in), about 66 g, C 8.06 kN." }, { "q": "What does the W in W 6203-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6203-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6203-ZZ?", "a": "The envelope matches, but stainless rates lower (C 8.06 kN for W 6203-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×40×12 mm envelope and equivalent catalogue ratings; W 6203-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "full", "note": "Same 17×40×12 mm envelope and equivalent catalogue ratings; W 6203 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203 shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203-2Z shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203-2RSH shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203-2RSL shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6203-C shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 11/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6203-C-2HRS shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 11/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6203-C-2Z shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 11/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203DDU shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203VV shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203ZZ shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203 shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203 shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203LLU shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203LLB shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203ZZ shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6203-ZZ", "W 6203-2Z" ], "locale_variants": {} }, { "sku": "W6203", "brand": "SKF", "manufacturer_designation": "W 6203", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 40000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 62, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, bore code 03 follows the 10/12/15/17 mm exception table, so 6203 fits a 17 mm shaft. Envelope 17×40×12 mm (0.669×1.575×0.472 in), C 8.06 kN, C0 4.75 kN, Pu 0.2 kN; limiting speed 26000 r/min and mass 62 g. The open W 6203 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6203; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6203 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6203 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6203 is not marine-grade stainless.", "Mount by heating the inner ring (max 120 °C) — driving W6203 home through the outer ring or balls brinells the raceways.", "Fillet radii must clear the W6203 chamfer so the 12 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6203?", "a": "SKF W 6203 measures 17×40×12 mm (0.669×1.575×0.472 in), about 62 g, C 8.06 kN." }, { "q": "What does the W in W 6203 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6203 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×40×12 mm envelope and equivalent catalogue ratings; W 6203-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×40×12 mm envelope and equivalent catalogue ratings; W 6203-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203 shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203-2Z shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203-2RSH shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6203-2RSL shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 9.95/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6203-C shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 11/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6203-C-2HRS shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 11/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6203-C-2Z shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 11/4.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203DDU shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203VV shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203ZZ shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6203 shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.5/4.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203 shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203LLU shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203LLB shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6203ZZ shares the 17×40×12 mm envelope but carries different catalogue ratings (8.06/4.75 kN vs 10.6/4.6 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6203", "W 6203" ], "locale_variants": {} }, { "sku": "W6303-2RS", "brand": "SKF", "manufacturer_designation": "W 6303-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.7, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 112, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, bore code 03 follows the 10/12/15/17 mm exception table, so 6303 fits a 17 mm shaft. Envelope 17×47×14 mm (0.669×1.85×0.551 in), C 11.7 kN, C0 6.55 kN, Pu 0.28 kN; limiting speed 10000 r/min and mass 112 g. SKF catalogues the sealed execution as W 6303-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6303-2RS is quoted at C 11.7 kN versus the 14 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6303-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6303-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6303-2RS inside the quoted grease temperature range.", "Mount by heating the inner ring (max 120 °C) — driving W6303-2RS home through the outer ring or balls brinells the raceways.", "Assign interference to the rotating ring: on a conventional shaft-mounted 17 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6303-2RS?", "a": "SKF W 6303-2RS1 measures 17×47×14 mm (0.669×1.85×0.551 in), about 112 g, C 11.7 kN." }, { "q": "What does the W in W 6303-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6303-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×47×14 mm envelope and equivalent catalogue ratings; W 6303-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "full", "note": "Same 17×47×14 mm envelope and equivalent catalogue ratings; W 6303 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6303 shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 14.3/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6303-2Z shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 14.3/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6303-2RSL shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 14.3/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6303-C shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15.8/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6303-C-2HRS shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15.8/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6303-C-2Z shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15.8/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303DDU shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303VV shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303ZZ shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303 shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303 shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303LLU shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303LLB shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303ZZ shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6303-2RS", "W 6303-2RS1" ], "locale_variants": {} }, { "sku": "W6303-ZZ", "brand": "SKF", "manufacturer_designation": "W 6303-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.7, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 36000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 113, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, bore code 03 follows the 10/12/15/17 mm exception table, so 6303 fits a 17 mm shaft. Envelope 17×47×14 mm (0.669×1.85×0.551 in), C 11.7 kN, C0 6.55 kN, Pu 0.28 kN; limiting speed 18000 r/min and mass 113 g. SKF spells the double shield W 6303-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6303-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6303-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6303-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6303-ZZ is not marine-grade stainless.", "Assign interference to the rotating ring: on a conventional shaft-mounted 17 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Assign interference to the rotating ring: on a conventional shaft-mounted 17 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6303-ZZ?", "a": "SKF W 6303-2Z measures 17×47×14 mm (0.669×1.85×0.551 in), about 113 g, C 11.7 kN." }, { "q": "What does the W in W 6303-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6303-ZZ?", "a": "The envelope matches, but stainless rates lower (C 11.7 kN for W 6303-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×47×14 mm envelope and equivalent catalogue ratings; W 6303-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "full", "note": "Same 17×47×14 mm envelope and equivalent catalogue ratings; W 6303 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6303 shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 14.3/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6303-2Z shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 14.3/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6303-2RSL shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 14.3/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6303-C shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15.8/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6303-C-2HRS shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15.8/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6303-C-2Z shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15.8/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303DDU shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303VV shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303ZZ shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303 shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303 shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303LLU shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303LLB shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303ZZ shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6303-ZZ", "W 6303-2Z" ], "locale_variants": {} }, { "sku": "W6303", "brand": "SKF", "manufacturer_designation": "W 6303", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.7, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 36000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 107, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, bore code 03 follows the 10/12/15/17 mm exception table, so 6303 fits a 17 mm shaft. Envelope 17×47×14 mm (0.669×1.85×0.551 in), C 11.7 kN, C0 6.55 kN, Pu 0.28 kN; limiting speed 22000 r/min and mass 107 g. The open W 6303 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6303 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6303 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6303 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6303 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6303-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Catalogue ratings for W6303 (C 11.7 kN, C0 6.55 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W6303?", "a": "SKF W 6303 measures 17×47×14 mm (0.669×1.85×0.551 in), about 107 g, C 11.7 kN." }, { "q": "What does the W in W 6303 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6303?", "a": "The envelope matches, but stainless rates lower (C 11.7 kN for W 6303); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×47×14 mm envelope and equivalent catalogue ratings; W 6303-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×47×14 mm envelope and equivalent catalogue ratings; W 6303-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6303 shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 14.3/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6303-2Z shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 14.3/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6303-2RSL shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 14.3/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6303-C shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15.8/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6303-C-2HRS shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15.8/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6303-C-2Z shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15.8/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303DDU shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303VV shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303ZZ shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6303 shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303 shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303LLU shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303LLB shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6303ZZ shares the 17×47×14 mm envelope but carries different catalogue ratings (11.7/6.55 kN vs 15/6.55 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6303", "W 6303" ], "locale_variants": {} }, { "sku": "W61804-2RS", "brand": "SKF", "manufacturer_designation": "W 61804-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.12, "static_load_kN": 2.08, "fatigue_load_limit_kN": 0.09, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 17, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, the last two digits encode the bore: 61804 carries code 04 = 20 mm (code × 5). Envelope 20×32×7 mm (0.787×1.26×0.276 in), C 3.12 kN, C0 2.08 kN, Pu 0.09 kN; limiting speed 13000 r/min and mass 17 g. SKF catalogues the sealed execution as W 61804-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W61804-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61804-2RS is quoted at C 3.12 kN versus the 7 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61804-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61804-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Catalogue ratings for W61804-2RS (C 3.12 kN, C0 2.08 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Fillet radii must clear the W61804-2RS chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W61804-2RS?", "a": "SKF W 61804-2RS1 measures 20×32×7 mm (0.787×1.26×0.276 in), about 17 g, C 3.12 kN." }, { "q": "What does the W in W 61804-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W61804-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W61804-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W61804-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 20×32×7 mm envelope and equivalent catalogue ratings; W 61804-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61804", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61804 shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.03/2.32 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61804-2RS1 shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.03/2.32 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61804-2RZ shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.03/2.32 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61804 shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.02/2.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61804-2RSR shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.02/2.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61804-2Z shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.02/2.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6804DD shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.4/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6804VV shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.4/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6804ZZ shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.4/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6804 shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.4/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6804JR shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.45/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6804JRLLU shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.45/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6804JRLLB shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.45/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6804JRZZ shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.45/2.47 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61804-2RS", "W 61804-2RS1" ], "locale_variants": {} }, { "sku": "W61804-ZZ", "brand": "SKF", "manufacturer_designation": "W 61804-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.12, "static_load_kN": 2.08, "fatigue_load_limit_kN": 0.09, "reference_speed_rpm": 48000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 17, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, the last two digits encode the bore: 61804 carries code 04 = 20 mm (code × 5). Envelope 20×32×7 mm (0.787×1.26×0.276 in), C 3.12 kN, C0 2.08 kN, Pu 0.09 kN; limiting speed 24000 r/min and mass 17 g. SKF spells the double shield W 61804-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61804-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61804-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61804-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61804-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 61804-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Assign interference to the rotating ring: on a conventional shaft-mounted 20 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W61804-ZZ?", "a": "SKF W 61804-2Z measures 20×32×7 mm (0.787×1.26×0.276 in), about 17 g, C 3.12 kN." }, { "q": "What does the W in W 61804-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W61804-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W61804-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W61804-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 20×32×7 mm envelope and equivalent catalogue ratings; W 61804-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61804", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61804 shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.03/2.32 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61804-2RS1 shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.03/2.32 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61804-2RZ shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.03/2.32 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61804 shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.02/2.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61804-2RSR shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.02/2.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61804-2Z shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.02/2.46 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6804DD shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.4/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6804VV shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.4/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6804ZZ shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.4/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6804 shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.4/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6804JR shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.45/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6804JRLLU shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.45/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6804JRLLB shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.45/2.47 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61804-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6804JRZZ shares the 20×32×7 mm envelope but carries different catalogue ratings (3.12/2.08 kN vs 4.45/2.47 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61804-ZZ", "W 61804-2Z" ], "locale_variants": {} }, { "sku": "W61904-2RS", "brand": "SKF", "manufacturer_designation": "W 61904-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.53, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 36, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, the last two digits encode the bore: 61904 carries code 04 = 20 mm (code × 5). Envelope 20×37×9 mm (0.787×1.457×0.354 in), C 5.53 kN, C0 3.65 kN, Pu 0.156 kN; limiting speed 12000 r/min and mass 36 g. SKF catalogues the sealed execution as W 61904-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61904-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61904-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61904-2RS is quoted at C 5.53 kN versus the 9 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61904-2RS; standard fill is industrial grease unless specified otherwise.", "Deep-groove geometry tolerates only minutes of misalignment; if the 37 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61904-2RS.", "At 20 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of the stainless W61904-2RS?", "a": "SKF W 61904-2RS1 measures 20×37×9 mm (0.787×1.457×0.354 in), about 36 g, C 5.53 kN." }, { "q": "What does the W in W 61904-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61904-2RS?", "a": "The envelope matches, but stainless rates lower (C 5.53 kN for W 61904-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W61904", "equiv_brand": "SKF", "level": "full", "note": "Same 20×37×9 mm envelope and equivalent catalogue ratings; W 61904 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61904", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61904 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.37/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61904-2RS1 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.37/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61904-2RZ shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.37/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61904 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.38/3.68 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61904-2RSR shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.38/3.68 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61904-2Z shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.38/3.68 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6904DDU shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6904VV shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6904ZZ shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6904 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6904 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7.05/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6904LLU shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7.05/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6904LLB shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7.05/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6904ZZ shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7.05/3.7 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61904-2RS", "W 61904-2RS1" ], "locale_variants": {} }, { "sku": "W61904", "brand": "SKF", "manufacturer_designation": "W 61904", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.53, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 43000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 32, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, the last two digits encode the bore: 61904 carries code 04 = 20 mm (code × 5). Envelope 20×37×9 mm (0.787×1.457×0.354 in), C 5.53 kN, C0 3.65 kN, Pu 0.156 kN; limiting speed 26000 r/min and mass 32 g. The open W 61904 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61904 is quoted at C 5.53 kN versus the 9 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61904; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61904 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61904 inside the quoted grease temperature range.", "At 20 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Assign interference to the rotating ring: on a conventional shaft-mounted 20 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W61904?", "a": "SKF W 61904 measures 20×37×9 mm (0.787×1.457×0.354 in), about 32 g, C 5.53 kN." }, { "q": "What does the W in W 61904 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61904?", "a": "The envelope matches, but stainless rates lower (C 5.53 kN for W 61904); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W61904-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 20×37×9 mm envelope and equivalent catalogue ratings; W 61904-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61904", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61904 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.37/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61904-2RS1 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.37/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61904-2RZ shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.37/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61904 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.38/3.68 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61904-2RSR shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.38/3.68 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61904-2Z shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 6.38/3.68 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6904DDU shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6904VV shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6904ZZ shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6904 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6904 shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7.05/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6904LLU shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7.05/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6904LLB shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7.05/3.7 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61904-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6904ZZ shares the 20×37×9 mm envelope but carries different catalogue ratings (5.53/3.65 kN vs 7.05/3.7 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61904", "W 61904" ], "locale_variants": {} }, { "sku": "W6004-2RS", "brand": "SKF", "manufacturer_designation": "W 6004-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 64, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6004 carries code 04 = 20 mm (code × 5). Envelope 20×42×12 mm (0.787×1.654×0.472 in), C 8.06 kN, C0 5 kN, Pu 0.212 kN; limiting speed 11000 r/min and mass 64 g. SKF catalogues the sealed execution as W 6004-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6004-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6004-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6004-2RS is quoted at C 8.06 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6004-2RS; standard fill is industrial grease unless specified otherwise.", "Mount by heating the inner ring (max 120 °C) — driving W6004-2RS home through the outer ring or balls brinells the raceways.", "Mount by heating the inner ring (max 120 °C) — driving W6004-2RS home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W6004-2RS?", "a": "SKF W 6004-2RS1 measures 20×42×12 mm (0.787×1.654×0.472 in), about 64 g, C 8.06 kN." }, { "q": "What does the W in W 6004-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6004-2RS?", "a": "The envelope matches, but stainless rates lower (C 8.06 kN for W 6004-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 20×42×12 mm envelope and equivalent catalogue ratings; W 6004-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "full", "note": "Same 20×42×12 mm envelope and equivalent catalogue ratings; W 6004 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004 shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004-2Z shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004-2RSH shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004-2RSL shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6004-C shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.6/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6004-C-2HRS shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.6/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6004-C-2Z shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.6/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004DDU shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004VV shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004ZZ shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004 shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004 shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004LLU shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004LLB shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004ZZ shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6004-2RS", "W 6004-2RS1" ], "locale_variants": {} }, { "sku": "W6004-ZZ", "brand": "SKF", "manufacturer_designation": "W 6004-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 64, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6004 carries code 04 = 20 mm (code × 5). Envelope 20×42×12 mm (0.787×1.654×0.472 in), C 8.06 kN, C0 5 kN, Pu 0.212 kN; limiting speed 19000 r/min and mass 64 g. SKF spells the double shield W 6004-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6004-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6004-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6004-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6004-ZZ is quoted at C 8.06 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6004-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Catalogue ratings for W6004-ZZ (C 8.06 kN, C0 5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W6004-ZZ?", "a": "SKF W 6004-2Z measures 20×42×12 mm (0.787×1.654×0.472 in), about 64 g, C 8.06 kN." }, { "q": "What does the W in W 6004-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6004-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 20×42×12 mm envelope and equivalent catalogue ratings; W 6004-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "full", "note": "Same 20×42×12 mm envelope and equivalent catalogue ratings; W 6004 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004 shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004-2Z shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004-2RSH shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004-2RSL shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6004-C shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.6/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6004-C-2HRS shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.6/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6004-C-2Z shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.6/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004DDU shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004VV shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004ZZ shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004 shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004 shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004LLU shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004LLB shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004ZZ shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6004-ZZ", "W 6004-2Z" ], "locale_variants": {} }, { "sku": "W6004", "brand": "SKF", "manufacturer_designation": "W 6004", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 60, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6004 carries code 04 = 20 mm (code × 5). Envelope 20×42×12 mm (0.787×1.654×0.472 in), C 8.06 kN, C0 5 kN, Pu 0.212 kN; limiting speed 24000 r/min and mass 60 g. The open W 6004 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6004 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6004 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6004 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6004 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Deep-groove geometry tolerates only minutes of misalignment; if the 42 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6004.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6004-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W6004?", "a": "SKF W 6004 measures 20×42×12 mm (0.787×1.654×0.472 in), about 60 g, C 8.06 kN." }, { "q": "What does the W in W 6004 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6004 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 20×42×12 mm envelope and equivalent catalogue ratings; W 6004-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 20×42×12 mm envelope and equivalent catalogue ratings; W 6004-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004 shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004-2Z shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004-2RSH shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6004-2RSL shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 9.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6004-C shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.6/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6004-C-2HRS shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.6/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6004-C-2Z shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.6/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004DDU shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004VV shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004ZZ shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6004 shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.3/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004 shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004LLU shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004LLB shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6004ZZ shares the 20×42×12 mm envelope but carries different catalogue ratings (8.06/5 kN vs 10.4/5.05 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6004", "W 6004" ], "locale_variants": {} }, { "sku": "W6204-2RS", "brand": "SKF", "manufacturer_designation": "W 6204-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.8, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 105, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6204 carries code 04 = 20 mm (code × 5). Envelope 20×47×14 mm (0.787×1.85×0.551 in), C 10.8 kN, C0 6.55 kN, Pu 0.28 kN; limiting speed 10000 r/min and mass 105 g. SKF catalogues the sealed execution as W 6204-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6204-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6204-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6204-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6204-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Assign interference to the rotating ring: on a conventional shaft-mounted 20 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Do not preload W6204-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of the stainless W6204-2RS?", "a": "SKF W 6204-2RS1 measures 20×47×14 mm (0.787×1.85×0.551 in), about 105 g, C 10.8 kN." }, { "q": "What does the W in W 6204-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6204-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6204-2RS?", "a": "The envelope matches, but stainless rates lower (C 10.8 kN for W 6204-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 20×47×14 mm envelope and equivalent catalogue ratings; W 6204-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "full", "note": "Same 20×47×14 mm envelope and equivalent catalogue ratings; W 6204 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204-2Z shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204-2RSH shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204-2RSL shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6204-C shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.7/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6204-C-2HRS shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.7/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6204-C-2Z shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.7/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204DDU shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204VV shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204ZZ shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204LLU shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204LLB shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204ZZ shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6204-2RS", "W 6204-2RS1" ], "locale_variants": {} }, { "sku": "W6204-ZZ", "brand": "SKF", "manufacturer_designation": "W 6204-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.8, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 106, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6204 carries code 04 = 20 mm (code × 5). Envelope 20×47×14 mm (0.787×1.85×0.551 in), C 10.8 kN, C0 6.55 kN, Pu 0.28 kN; limiting speed 17000 r/min and mass 106 g. SKF spells the double shield W 6204-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6204-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6204-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6204-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6204-ZZ is quoted at C 10.8 kN versus the 14 mm-wide 52100 version — do not swap on dimensions alone.", "Do not preload W6204-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Deep-groove geometry tolerates only minutes of misalignment; if the 47 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6204-ZZ." ], "faq": [ { "q": "What are the dimensions of the stainless W6204-ZZ?", "a": "SKF W 6204-2Z measures 20×47×14 mm (0.787×1.85×0.551 in), about 106 g, C 10.8 kN." }, { "q": "What does the W in W 6204-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6204-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6204-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 20×47×14 mm envelope and equivalent catalogue ratings; W 6204-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "full", "note": "Same 20×47×14 mm envelope and equivalent catalogue ratings; W 6204 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204-2Z shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204-2RSH shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204-2RSL shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6204-C shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.7/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6204-C-2HRS shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.7/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6204-C-2Z shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.7/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204DDU shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204VV shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204ZZ shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204LLU shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204LLB shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204ZZ shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6204-ZZ", "W 6204-2Z" ], "locale_variants": {} }, { "sku": "W6204", "brand": "SKF", "manufacturer_designation": "W 6204", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.8, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 34000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6204 carries code 04 = 20 mm (code × 5). Envelope 20×47×14 mm (0.787×1.85×0.551 in), C 10.8 kN, C0 6.55 kN, Pu 0.28 kN; limiting speed 22000 r/min and mass 100 g. The open W 6204 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6204 is quoted at C 10.8 kN versus the 14 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6204; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6204 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6204 inside the quoted grease temperature range.", "Do not preload W6204 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Assign interference to the rotating ring: on a conventional shaft-mounted 20 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6204?", "a": "SKF W 6204 measures 20×47×14 mm (0.787×1.85×0.551 in), about 100 g, C 10.8 kN." }, { "q": "What does the W in W 6204 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6204 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6204?", "a": "The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication." } ], "cross_ref": [ { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 20×47×14 mm envelope and equivalent catalogue ratings; W 6204-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 20×47×14 mm envelope and equivalent catalogue ratings; W 6204-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204-2Z shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204-2RSH shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6204-2RSL shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 13.5/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6204-C shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.7/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6204-C-2HRS shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.7/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6204-C-2Z shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.7/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204DDU shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204VV shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204ZZ shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.1/6.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204 shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204LLU shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204LLB shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6204ZZ shares the 20×47×14 mm envelope but carries different catalogue ratings (10.8/6.55 kN vs 14.2/6.65 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6204", "W 6204" ], "locale_variants": {} }, { "sku": "W6304-2RS", "brand": "SKF", "manufacturer_designation": "W 6304-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 143, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6304 carries code 04 = 20 mm (code × 5). Envelope 20×52×15 mm (0.787×2.047×0.591 in), C 13.8 kN, C0 7.8 kN, Pu 0.335 kN; limiting speed 9500 r/min and mass 143 g. SKF catalogues the sealed execution as W 6304-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6304-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6304-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6304-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6304-2RS is not marine-grade stainless.", "Deep-groove geometry tolerates only minutes of misalignment; if the 52 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6304-2RS.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6304-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W6304-2RS?", "a": "SKF W 6304-2RS1 measures 20×52×15 mm (0.787×2.047×0.591 in), about 143 g, C 13.8 kN." }, { "q": "What does the W in W 6304-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6304-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6304-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 20×52×15 mm envelope and equivalent catalogue ratings; W 6304-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "full", "note": "Same 20×52×15 mm envelope and equivalent catalogue ratings; W 6304 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304-2Z shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304-2RSH shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304-2RSL shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.9/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6304-2RSR shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.9/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6304-2Z shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.9/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304DDU shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304VV shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304ZZ shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304LLU shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304LLB shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304ZZ shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6304-2RS", "W 6304-2RS1" ], "locale_variants": {} }, { "sku": "W6304-ZZ", "brand": "SKF", "manufacturer_designation": "W 6304-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 144, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6304 carries code 04 = 20 mm (code × 5). Envelope 20×52×15 mm (0.787×2.047×0.591 in), C 13.8 kN, C0 7.8 kN, Pu 0.335 kN; limiting speed 17000 r/min and mass 144 g. SKF spells the double shield W 6304-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6304-ZZ is quoted at C 13.8 kN versus the 15 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6304-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6304-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6304-ZZ inside the quoted grease temperature range.", "The fatigue load limit is 0.335 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Fillet radii must clear the W6304-ZZ chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6304-ZZ?", "a": "SKF W 6304-2Z measures 20×52×15 mm (0.787×2.047×0.591 in), about 144 g, C 13.8 kN." }, { "q": "What does the W in W 6304-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6304-ZZ?", "a": "The envelope matches, but stainless rates lower (C 13.8 kN for W 6304-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 20×52×15 mm envelope and equivalent catalogue ratings; W 6304-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "full", "note": "Same 20×52×15 mm envelope and equivalent catalogue ratings; W 6304 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304-2Z shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304-2RSH shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304-2RSL shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.9/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6304-2RSR shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.9/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6304-2Z shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.9/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304DDU shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304VV shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304ZZ shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304LLU shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304LLB shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304ZZ shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6304-ZZ", "W 6304-2Z" ], "locale_variants": {} }, { "sku": "W6304", "brand": "SKF", "manufacturer_designation": "W 6304", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 34000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 136, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6304 carries code 04 = 20 mm (code × 5). Envelope 20×52×15 mm (0.787×2.047×0.591 in), C 13.8 kN, C0 7.8 kN, Pu 0.335 kN; limiting speed 20000 r/min and mass 136 g. The open W 6304 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W6304 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6304 is quoted at C 13.8 kN versus the 15 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6304; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6304 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Deep-groove geometry tolerates only minutes of misalignment; if the 52 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6304.", "Fillet radii must clear the W6304 chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6304?", "a": "SKF W 6304 measures 20×52×15 mm (0.787×2.047×0.591 in), about 136 g, C 13.8 kN." }, { "q": "What does the W in W 6304 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6304?", "a": "The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6304; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 20×52×15 mm envelope and equivalent catalogue ratings; W 6304-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 20×52×15 mm envelope and equivalent catalogue ratings; W 6304-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304-2Z shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304-2RSH shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6304-2RSL shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.9/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6304-2RSR shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.9/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6304-2Z shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 16.9/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304DDU shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304VV shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304ZZ shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.5/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304 shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304LLU shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304LLB shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6304ZZ shares the 20×52×15 mm envelope but carries different catalogue ratings (13.8/7.8 kN vs 17.6/7.9 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6304", "W 6304" ], "locale_variants": {} }, { "sku": "W61805-2RS", "brand": "SKF", "manufacturer_designation": "W 61805-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.38, "static_load_kN": 2.5, "fatigue_load_limit_kN": 0.108, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 21, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, the last two digits encode the bore: 61805 carries code 05 = 25 mm (code × 5). Envelope 25×37×7 mm (0.984×1.457×0.276 in), C 3.38 kN, C0 2.5 kN, Pu 0.108 kN; limiting speed 11000 r/min and mass 21 g. SKF catalogues the sealed execution as W 61805-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61805-2RS is quoted at C 3.38 kN versus the 7 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61805-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61805-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61805-2RS inside the quoted grease temperature range.", "Deep-groove geometry tolerates only minutes of misalignment; if the 37 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61805-2RS.", "Fillet radii must clear the W61805-2RS chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W61805-2RS?", "a": "SKF W 61805-2RS1 measures 25×37×7 mm (0.984×1.457×0.276 in), about 21 g, C 3.38 kN." }, { "q": "What does the W in W 61805-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W61805-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W61805-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 25×37×7 mm envelope and equivalent catalogue ratings; W 61805-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61805", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61805 shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.36/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61805-2RS1 shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.36/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61805-2RZ shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.36/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61805 shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.3/2.94 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61805-2RSR shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.3/2.94 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61805-2Z shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.3/2.94 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6805DD shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.95/3.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6805VV shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.95/3.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6805ZZ shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.95/3.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6805 shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.95/3.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6805JR shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.75/2.95 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6805JRLLU shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.75/2.95 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6805JRLLB shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.75/2.95 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6805JRZZ shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.75/2.95 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61805-2RS", "W 61805-2RS1" ], "locale_variants": {} }, { "sku": "W61805-ZZ", "brand": "SKF", "manufacturer_designation": "W 61805-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.38, "static_load_kN": 2.5, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 21, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, the last two digits encode the bore: 61805 carries code 05 = 25 mm (code × 5). Envelope 25×37×7 mm (0.984×1.457×0.276 in), C 3.38 kN, C0 2.5 kN, Pu 0.108 kN; limiting speed 19000 r/min and mass 21 g. SKF spells the double shield W 61805-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61805-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61805-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61805-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61805-ZZ is quoted at C 3.38 kN versus the 7 mm-wide 52100 version — do not swap on dimensions alone.", "The fatigue load limit is 0.108 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of the stainless W61805-ZZ?", "a": "SKF W 61805-2Z measures 25×37×7 mm (0.984×1.457×0.276 in), about 21 g, C 3.38 kN." }, { "q": "What does the W in W 61805-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61805-ZZ?", "a": "The envelope matches, but stainless rates lower (C 3.38 kN for W 61805-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W61805-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 25×37×7 mm envelope and equivalent catalogue ratings; W 61805-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61805", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61805 shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.36/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61805-2RS1 shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.36/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61805-2RZ shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.36/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61805 shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.3/2.94 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61805-2RSR shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.3/2.94 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61805-2Z shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.3/2.94 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6805DD shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.95/3.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6805VV shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.95/3.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6805ZZ shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.95/3.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6805 shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.95/3.15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6805JR shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.75/2.95 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6805JRLLU shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.75/2.95 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6805JRLLB shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.75/2.95 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61805-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6805JRZZ shares the 25×37×7 mm envelope but carries different catalogue ratings (3.38/2.5 kN vs 4.75/2.95 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61805-ZZ", "W 61805-2Z" ], "locale_variants": {} }, { "sku": "W61905-2RS", "brand": "SKF", "manufacturer_designation": "W 61905-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.05, "static_load_kN": 4.5, "fatigue_load_limit_kN": 0.193, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 40, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, the last two digits encode the bore: 61905 carries code 05 = 25 mm (code × 5). Envelope 25×42×9 mm (0.984×1.654×0.354 in), C 6.05 kN, C0 4.5 kN, Pu 0.193 kN; limiting speed 10000 r/min and mass 40 g. SKF catalogues the sealed execution as W 61905-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W61905-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61905-2RS is quoted at C 6.05 kN versus the 9 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61905-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61905-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Assign interference to the rotating ring: on a conventional shaft-mounted 25 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 61905-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W61905-2RS?", "a": "SKF W 61905-2RS1 measures 25×42×9 mm (0.984×1.654×0.354 in), about 40 g, C 6.05 kN." }, { "q": "What does the W in W 61905-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W61905-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W61905-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "61905", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61905 shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.02/4.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61905-2RS1 shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.02/4.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61905-2RZ shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.02/4.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61905 shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.01/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61905-2RSR shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.01/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61905-2Z shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.01/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6905DDU shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.75/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6905VV shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.75/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6905ZZ shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.75/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6905 shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.75/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6905 shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.8/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6905LLU shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.8/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6905LLB shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.8/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61905-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6905ZZ shares the 25×42×9 mm envelope but carries different catalogue ratings (6.05/4.5 kN vs 7.8/4.55 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61905-2RS", "W 61905-2RS1" ], "locale_variants": {} }, { "sku": "W6005-2RS", "brand": "SKF", "manufacturer_designation": "W 6005-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.71, "static_load_kN": 5.85, "fatigue_load_limit_kN": 0.25, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 76, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6005 carries code 05 = 25 mm (code × 5). Envelope 25×47×12 mm (0.984×1.85×0.472 in), C 8.71 kN, C0 5.85 kN, Pu 0.25 kN; limiting speed 9500 r/min and mass 76 g. SKF catalogues the sealed execution as W 6005-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W6005-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6005-2RS is quoted at C 8.71 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6005-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6005-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Assign interference to the rotating ring: on a conventional shaft-mounted 25 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Catalogue ratings for W6005-2RS (C 8.71 kN, C0 5.85 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W6005-2RS?", "a": "SKF W 6005-2RS1 measures 25×47×12 mm (0.984×1.85×0.472 in), about 76 g, C 8.71 kN." }, { "q": "What does the W in W 6005-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6005-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6005-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 25×47×12 mm envelope and equivalent catalogue ratings; W 6005-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "full", "note": "Same 25×47×12 mm envelope and equivalent catalogue ratings; W 6005 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005 shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005-2Z shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005-2RSH shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005-2RSL shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6005-C shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 12.6/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6005-C-2HRS shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 12.6/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6005-C-2Z shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 12.6/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005DDU shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005VV shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005ZZ shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005 shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6005-2RS", "W 6005-2RS1" ], "locale_variants": {} }, { "sku": "W6005-ZZ", "brand": "SKF", "manufacturer_designation": "W 6005-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.71, "static_load_kN": 5.85, "fatigue_load_limit_kN": 0.25, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 78, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6005 carries code 05 = 25 mm (code × 5). Envelope 25×47×12 mm (0.984×1.85×0.472 in), C 8.71 kN, C0 5.85 kN, Pu 0.25 kN; limiting speed 16000 r/min and mass 78 g. SKF spells the double shield W 6005-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6005-ZZ is quoted at C 8.71 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6005-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6005-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6005-ZZ inside the quoted grease temperature range.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6005-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Fillet radii must clear the W6005-ZZ chamfer so the 12 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6005-ZZ?", "a": "SKF W 6005-2Z measures 25×47×12 mm (0.984×1.85×0.472 in), about 78 g, C 8.71 kN." }, { "q": "What does the W in W 6005-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6005-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6005-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 25×47×12 mm envelope and equivalent catalogue ratings; W 6005-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "full", "note": "Same 25×47×12 mm envelope and equivalent catalogue ratings; W 6005 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005 shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005-2Z shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005-2RSH shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005-2RSL shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6005-C shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 12.6/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6005-C-2HRS shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 12.6/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6005-C-2Z shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 12.6/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005DDU shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005VV shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005ZZ shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005 shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6005-ZZ", "W 6005-2Z" ], "locale_variants": {} }, { "sku": "W6005", "brand": "SKF", "manufacturer_designation": "W 6005", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.71, "static_load_kN": 5.85, "fatigue_load_limit_kN": 0.25, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 72, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6005 carries code 05 = 25 mm (code × 5). Envelope 25×47×12 mm (0.984×1.85×0.472 in), C 8.71 kN, C0 5.85 kN, Pu 0.25 kN; limiting speed 20000 r/min and mass 72 g. The open W 6005 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6005; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6005 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6005 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6005 is not marine-grade stainless.", "Do not preload W6005 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of the stainless W6005?", "a": "SKF W 6005 measures 25×47×12 mm (0.984×1.85×0.472 in), about 72 g, C 8.71 kN." }, { "q": "What does the W in W 6005 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6005 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6005?", "a": "The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication." } ], "cross_ref": [ { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 25×47×12 mm envelope and equivalent catalogue ratings; W 6005-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 25×47×12 mm envelope and equivalent catalogue ratings; W 6005-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005 shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005-2Z shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005-2RSH shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6005-2RSL shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.9/6.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6005-C shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 12.6/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6005-C-2HRS shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 12.6/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6005-C-2Z shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 12.6/6.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005DDU shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005VV shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005ZZ shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6005 shares the 25×47×12 mm envelope but carries different catalogue ratings (8.71/5.85 kN vs 11.1/5.85 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6005", "W 6005" ], "locale_variants": {} }, { "sku": "W6205-2RS", "brand": "SKF", "manufacturer_designation": "W 6205-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.7, "static_load_kN": 7.65, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 128, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6205 carries code 05 = 25 mm (code × 5). Envelope 25×52×15 mm (0.984×2.047×0.591 in), C 11.7 kN, C0 7.65 kN, Pu 0.335 kN; limiting speed 8500 r/min and mass 128 g. SKF catalogues the sealed execution as W 6205-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6205-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6205-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6205-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6205-2RS is quoted at C 11.7 kN versus the 15 mm-wide 52100 version — do not swap on dimensions alone.", "Fillet radii must clear the W6205-2RS chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Mount by heating the inner ring (max 120 °C) — driving W6205-2RS home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W6205-2RS?", "a": "SKF W 6205-2RS1 measures 25×52×15 mm (0.984×2.047×0.591 in), about 128 g, C 11.7 kN." }, { "q": "What does the W in W 6205-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6205-2RS?", "a": "The envelope matches, but stainless rates lower (C 11.7 kN for W 6205-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 25×52×15 mm envelope and equivalent catalogue ratings; W 6205-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "full", "note": "Same 25×52×15 mm envelope and equivalent catalogue ratings; W 6205 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205 shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205-2Z shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205-2RSH shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205-2RSL shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6205-C shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6205-C-2HRS shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6205-C-2Z shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205DDU shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205VV shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205ZZ shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205 shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205 shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205LLU shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205LLB shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205ZZ shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6205-2RS", "W 6205-2RS1" ], "locale_variants": {} }, { "sku": "W6205-ZZ", "brand": "SKF", "manufacturer_designation": "W 6205-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.7, "static_load_kN": 7.65, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6205 carries code 05 = 25 mm (code × 5). Envelope 25×52×15 mm (0.984×2.047×0.591 in), C 11.7 kN, C0 7.65 kN, Pu 0.335 kN; limiting speed 15000 r/min and mass 130 g. SKF spells the double shield W 6205-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6205-ZZ is quoted at C 11.7 kN versus the 15 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6205-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6205-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6205-ZZ inside the quoted grease temperature range.", "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Deep-groove geometry tolerates only minutes of misalignment; if the 52 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6205-ZZ." ], "faq": [ { "q": "What are the dimensions of the stainless W6205-ZZ?", "a": "SKF W 6205-2Z measures 25×52×15 mm (0.984×2.047×0.591 in), about 130 g, C 11.7 kN." }, { "q": "What does the W in W 6205-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6205-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6205-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 25×52×15 mm envelope and equivalent catalogue ratings; W 6205-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "full", "note": "Same 25×52×15 mm envelope and equivalent catalogue ratings; W 6205 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205 shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205-2Z shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205-2RSH shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205-2RSL shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6205-C shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6205-C-2HRS shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6205-C-2Z shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205DDU shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205VV shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205ZZ shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205 shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205 shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205LLU shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205LLB shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205ZZ shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6205-ZZ", "W 6205-2Z" ], "locale_variants": {} }, { "sku": "W6205", "brand": "SKF", "manufacturer_designation": "W 6205", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.7, "static_load_kN": 7.65, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 122, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6205 carries code 05 = 25 mm (code × 5). Envelope 25×52×15 mm (0.984×2.047×0.591 in), C 11.7 kN, C0 7.65 kN, Pu 0.335 kN; limiting speed 19000 r/min and mass 122 g. The open W 6205 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W6205 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6205 is quoted at C 11.7 kN versus the 15 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6205; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6205 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6205-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Deep-groove geometry tolerates only minutes of misalignment; if the 52 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6205." ], "faq": [ { "q": "What are the dimensions of the stainless W6205?", "a": "SKF W 6205 measures 25×52×15 mm (0.984×2.047×0.591 in), about 122 g, C 11.7 kN." }, { "q": "What does the W in W 6205 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6205?", "a": "The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6205; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 25×52×15 mm envelope and equivalent catalogue ratings; W 6205-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 25×52×15 mm envelope and equivalent catalogue ratings; W 6205-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205 shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205-2Z shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205-2RSH shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6205-2RSL shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 14.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6205-C shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6205-C-2HRS shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6205-C-2Z shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.9/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205DDU shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205VV shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205ZZ shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6205 shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.4/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205 shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205LLU shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205LLB shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6205ZZ shares the 25×52×15 mm envelope but carries different catalogue ratings (11.7/7.65 kN vs 15.5/7.85 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6205", "W 6205" ], "locale_variants": {} }, { "sku": "W6305-2RS", "brand": "SKF", "manufacturer_designation": "W 6305-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.48, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 234, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6305 carries code 05 = 25 mm (code × 5). Envelope 25×62×17 mm (0.984×2.441×0.669 in), C 17.8 kN, C0 11.2 kN, Pu 0.48 kN; limiting speed 7500 r/min and mass 234 g. SKF catalogues the sealed execution as W 6305-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6305-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6305-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6305-2RS is quoted at C 17.8 kN versus the 17 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6305-2RS; standard fill is industrial grease unless specified otherwise.", "Mount by heating the inner ring (max 120 °C) — driving W6305-2RS home through the outer ring or balls brinells the raceways.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6305-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W6305-2RS?", "a": "SKF W 6305-2RS1 measures 25×62×17 mm (0.984×2.441×0.669 in), about 234 g, C 17.8 kN." }, { "q": "What does the W in W 6305-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6305-2RS?", "a": "The envelope matches, but stainless rates lower (C 17.8 kN for W 6305-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 25×62×17 mm envelope and equivalent catalogue ratings; W 6305-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "full", "note": "Same 25×62×17 mm envelope and equivalent catalogue ratings; W 6305 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (17.8/11.2 kN vs 22.9/15.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (17.8/11.2 kN vs 22.9/15.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305 shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2Z shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RSH shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RZ shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6305-C shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 26.5/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6305-C-2HRS shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 26.5/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6305-C-2Z shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 26.5/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305DDU shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305VV shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305ZZ shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305 shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305 shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305LLU shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305LLB shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305ZZ shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6305-2RS", "W 6305-2RS1" ], "locale_variants": {} }, { "sku": "W6305-ZZ", "brand": "SKF", "manufacturer_designation": "W 6305-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.48, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 235, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6305 carries code 05 = 25 mm (code × 5). Envelope 25×62×17 mm (0.984×2.441×0.669 in), C 17.8 kN, C0 11.2 kN, Pu 0.48 kN; limiting speed 13000 r/min and mass 235 g. SKF spells the double shield W 6305-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6305-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6305-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6305-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6305-ZZ is quoted at C 17.8 kN versus the 17 mm-wide 52100 version — do not swap on dimensions alone.", "Assign interference to the rotating ring: on a conventional shaft-mounted 25 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Fillet radii must clear the W6305-ZZ chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6305-ZZ?", "a": "SKF W 6305-2Z measures 25×62×17 mm (0.984×2.441×0.669 in), about 235 g, C 17.8 kN." }, { "q": "What does the W in W 6305-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6305-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6305-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 25×62×17 mm envelope and equivalent catalogue ratings; W 6305-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "full", "note": "Same 25×62×17 mm envelope and equivalent catalogue ratings; W 6305 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (17.8/11.2 kN vs 22.9/15.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (17.8/11.2 kN vs 22.9/15.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305 shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2Z shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RSH shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RZ shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6305-C shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 26.5/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6305-C-2HRS shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 26.5/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6305-C-2Z shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 26.5/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305DDU shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305VV shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305ZZ shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305 shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305 shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305LLU shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305LLB shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305ZZ shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6305-ZZ", "W 6305-2Z" ], "locale_variants": {} }, { "sku": "W6305", "brand": "SKF", "manufacturer_designation": "W 6305", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.48, "reference_speed_rpm": 26000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 224, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6305 carries code 05 = 25 mm (code × 5). Envelope 25×62×17 mm (0.984×2.441×0.669 in), C 17.8 kN, C0 11.2 kN, Pu 0.48 kN; limiting speed 17000 r/min and mass 224 g. The open W 6305 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6305 is quoted at C 17.8 kN versus the 17 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6305; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6305 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6305 inside the quoted grease temperature range.", "Assign interference to the rotating ring: on a conventional shaft-mounted 25 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "The fatigue load limit is 0.48 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6305?", "a": "SKF W 6305 measures 25×62×17 mm (0.984×2.441×0.669 in), about 224 g, C 17.8 kN." }, { "q": "What does the W in W 6305 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6305 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6305?", "a": "The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication." } ], "cross_ref": [ { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 25×62×17 mm envelope and equivalent catalogue ratings; W 6305-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 25×62×17 mm envelope and equivalent catalogue ratings; W 6305-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (17.8/11.2 kN vs 22.9/15.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (17.8/11.2 kN vs 22.9/15.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305 shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2Z shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RSH shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RZ shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.4/11.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6305-C shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 26.5/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6305-C-2HRS shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 26.5/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6305-C-2Z shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 26.5/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305DDU shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305VV shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305ZZ shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6305 shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 22.6/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305 shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305LLU shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305LLB shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6305ZZ shares the 25×62×17 mm envelope but carries different catalogue ratings (17.8/11.2 kN vs 23.5/10.9 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6305", "W 6305" ], "locale_variants": {} }, { "sku": "W61806-2RS", "brand": "SKF", "manufacturer_designation": "W 61806-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.58, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.125, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 24, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, the last two digits encode the bore: 61806 carries code 06 = 30 mm (code × 5). Envelope 30×42×7 mm (1.181×1.654×0.276 in), C 3.58 kN, C0 2.9 kN, Pu 0.125 kN; limiting speed 9500 r/min and mass 24 g. SKF catalogues the sealed execution as W 61806-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61806-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61806-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61806-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61806-2RS is quoted at C 3.58 kN versus the 7 mm-wide 52100 version — do not swap on dimensions alone.", "Catalogue ratings for W61806-2RS (C 3.58 kN, C0 2.9 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Fillet radii must clear the W61806-2RS chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W61806-2RS?", "a": "SKF W 61806-2RS1 measures 30×42×7 mm (1.181×1.654×0.276 in), about 24 g, C 3.58 kN." }, { "q": "What does the W in W 61806-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61806-2RS?", "a": "The envelope matches, but stainless rates lower (C 3.58 kN for W 61806-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "61806", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61806 shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 4.49/2.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61806-2RS1 shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 4.49/2.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61806-2RZ shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 4.49/2.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61806 shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 4.45/3.44 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61806-2RSR shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 4.45/3.44 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61806-2Z shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 4.45/3.44 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6806DD shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 5.2/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6806VV shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 5.2/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6806ZZ shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 5.2/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6806 shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 5.2/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6806JR shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 5.2/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6806JRLLU shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 5.2/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6806JRLLB shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 5.2/3.65 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61806-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6806JRZZ shares the 30×42×7 mm envelope but carries different catalogue ratings (3.58/2.9 kN vs 5.2/3.65 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61806-2RS", "W 61806-2RS1" ], "locale_variants": {} }, { "sku": "W61906-2RS", "brand": "SKF", "manufacturer_designation": "W 61906-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.24, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 47, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, the last two digits encode the bore: 61906 carries code 06 = 30 mm (code × 5). Envelope 30×47×9 mm (1.181×1.85×0.354 in), C 6.24 kN, C0 5 kN, Pu 0.212 kN; limiting speed 8500 r/min and mass 47 g. SKF catalogues the sealed execution as W 61906-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61906-2RS is quoted at C 6.24 kN versus the 9 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61906-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61906-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61906-2RS inside the quoted grease temperature range.", "Catalogue ratings for W61906-2RS (C 6.24 kN, C0 5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Fillet radii must clear the W61906-2RS chamfer so the 9 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W61906-2RS?", "a": "SKF W 61906-2RS1 measures 30×47×9 mm (1.181×1.85×0.354 in), about 47 g, C 6.24 kN." }, { "q": "What does the W in W 61906-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61906-2RS?", "a": "The envelope matches, but stainless rates lower (C 6.24 kN for W 61906-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W61906", "equiv_brand": "SKF", "level": "full", "note": "Same 30×47×9 mm envelope and equivalent catalogue ratings; W 61906 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61906", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61906 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.28/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61906-2RS1 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.28/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61906-2RZ shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.28/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61906 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.24/5.01 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61906-2RSR shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.24/5.01 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61906-2Z shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.24/5.01 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6906DDU shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6906VV shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6906ZZ shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6906 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6906 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 8/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6906LLU shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 8/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6906LLB shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 8/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6906ZZ shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 8/5 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61906-2RS", "W 61906-2RS1" ], "locale_variants": {} }, { "sku": "W61906", "brand": "SKF", "manufacturer_designation": "W 61906", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.24, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 44, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, the last two digits encode the bore: 61906 carries code 06 = 30 mm (code × 5). Envelope 30×47×9 mm (1.181×1.85×0.354 in), C 6.24 kN, C0 5 kN, Pu 0.212 kN; limiting speed 19000 r/min and mass 44 g. The open W 61906 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61906 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61906 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61906 is quoted at C 6.24 kN versus the 9 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61906; standard fill is industrial grease unless specified otherwise.", "Mount by heating the inner ring (max 120 °C) — driving W61906 home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.212 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W61906?", "a": "SKF W 61906 measures 30×47×9 mm (1.181×1.85×0.354 in), about 44 g, C 6.24 kN." }, { "q": "What does the W in W 61906 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W61906?", "a": "The open bearing may ship with a rust-preventive film only; specify a food-grade grease for HACCP areas and plan relubrication." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W61906; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W61906-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 30×47×9 mm envelope and equivalent catalogue ratings; W 61906-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61906", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61906 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.28/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61906-2RS1 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.28/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61906-2RZ shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.28/4.55 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61906 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.24/5.01 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61906-2RSR shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.24/5.01 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61906-2Z shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.24/5.01 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6906DDU shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6906VV shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6906ZZ shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6906 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 7.95/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6906 shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 8/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6906LLU shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 8/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6906LLB shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 8/5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61906-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6906ZZ shares the 30×47×9 mm envelope but carries different catalogue ratings (6.24/5 kN vs 8/5 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61906", "W 61906" ], "locale_variants": {} }, { "sku": "W6006-2RS", "brand": "SKF", "manufacturer_designation": "W 6006-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.4, "static_load_kN": 8.15, "fatigue_load_limit_kN": 0.355, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 112, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6006 carries code 06 = 30 mm (code × 5). Envelope 30×55×13 mm (1.181×2.165×0.512 in), C 11.4 kN, C0 8.15 kN, Pu 0.355 kN; limiting speed 8000 r/min and mass 112 g. SKF catalogues the sealed execution as W 6006-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6006-2RS is quoted at C 11.4 kN versus the 13 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6006-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6006-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6006-2RS inside the quoted grease temperature range.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6006-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Catalogue ratings for W6006-2RS (C 11.4 kN, C0 8.15 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W6006-2RS?", "a": "SKF W 6006-2RS1 measures 30×55×13 mm (1.181×2.165×0.512 in), about 112 g, C 11.4 kN." }, { "q": "What does the W in W 6006-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6006-2RS?", "a": "The envelope matches, but stainless rates lower (C 11.4 kN for W 6006-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6006-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 30×55×13 mm envelope and equivalent catalogue ratings; W 6006-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6006", "equiv_brand": "SKF", "level": "full", "note": "Same 30×55×13 mm envelope and equivalent catalogue ratings; W 6006 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6006-2Z shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 13.8/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6006-2RS1 shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 13.8/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6006-2RZ shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 13.8/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6006-C shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.5/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6006-C-2HRS shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.5/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6006-C-2Z shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.5/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006DDU shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006VV shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006ZZ shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006 shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6006-2RS", "W 6006-2RS1" ], "locale_variants": {} }, { "sku": "W6006-ZZ", "brand": "SKF", "manufacturer_designation": "W 6006-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.4, "static_load_kN": 8.15, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 113, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6006 carries code 06 = 30 mm (code × 5). Envelope 30×55×13 mm (1.181×2.165×0.512 in), C 11.4 kN, C0 8.15 kN, Pu 0.355 kN; limiting speed 14000 r/min and mass 113 g. SKF spells the double shield W 6006-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6006-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6006-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6006-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6006-ZZ is not marine-grade stainless.", "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of the stainless W6006-ZZ?", "a": "SKF W 6006-2Z measures 30×55×13 mm (1.181×2.165×0.512 in), about 113 g, C 11.4 kN." }, { "q": "What does the W in W 6006-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6006-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6006-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6006-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 30×55×13 mm envelope and equivalent catalogue ratings; W 6006-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6006", "equiv_brand": "SKF", "level": "full", "note": "Same 30×55×13 mm envelope and equivalent catalogue ratings; W 6006 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6006-2Z shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 13.8/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6006-2RS1 shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 13.8/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6006-2RZ shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 13.8/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6006-C shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.5/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6006-C-2HRS shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.5/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6006-C-2Z shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.5/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006DDU shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006VV shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006ZZ shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006 shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6006-ZZ", "W 6006-2Z" ], "locale_variants": {} }, { "sku": "W6006", "brand": "SKF", "manufacturer_designation": "W 6006", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.4, "static_load_kN": 8.15, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 105, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6006 carries code 06 = 30 mm (code × 5). Envelope 30×55×13 mm (1.181×2.165×0.512 in), C 11.4 kN, C0 8.15 kN, Pu 0.355 kN; limiting speed 17000 r/min and mass 105 g. The open W 6006 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6006 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6006 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6006 is quoted at C 11.4 kN versus the 13 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6006; standard fill is industrial grease unless specified otherwise.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6006-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Deep-groove geometry tolerates only minutes of misalignment; if the 55 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6006." ], "faq": [ { "q": "What are the dimensions of the stainless W6006?", "a": "SKF W 6006 measures 30×55×13 mm (1.181×2.165×0.512 in), about 105 g, C 11.4 kN." }, { "q": "What does the W in W 6006 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6006; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6006?", "a": "The envelope matches, but stainless rates lower (C 11.4 kN for W 6006); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6006-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 30×55×13 mm envelope and equivalent catalogue ratings; W 6006-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6006-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 30×55×13 mm envelope and equivalent catalogue ratings; W 6006-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6006-2Z shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 13.8/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6006-2RS1 shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 13.8/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6006-2RZ shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 13.8/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6006-C shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.5/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6006-C-2HRS shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.5/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6006-C-2Z shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.5/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006DDU shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006VV shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006ZZ shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6006 shares the 30×55×13 mm envelope but carries different catalogue ratings (11.4/8.15 kN vs 14.6/8.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6006", "W 6006" ], "locale_variants": {} }, { "sku": "W6206-2RS", "brand": "SKF", "manufacturer_designation": "W 6206-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.48, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 196, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6206 carries code 06 = 30 mm (code × 5). Envelope 30×62×16 mm (1.181×2.441×0.63 in), C 16.5 kN, C0 11.2 kN, Pu 0.48 kN; limiting speed 7000 r/min and mass 196 g. SKF catalogues the sealed execution as W 6206-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6206-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6206-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6206-2RS is quoted at C 16.5 kN versus the 16 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6206-2RS; standard fill is industrial grease unless specified otherwise.", "Do not preload W6206-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Fillet radii must clear the W6206-2RS chamfer so the 16 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6206-2RS?", "a": "SKF W 6206-2RS1 measures 30×62×16 mm (1.181×2.441×0.63 in), about 196 g, C 16.5 kN." }, { "q": "What does the W in W 6206-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6206-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6206-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×16 mm envelope and equivalent catalogue ratings; W 6206-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×16 mm envelope and equivalent catalogue ratings; W 6206 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (16.5/11.2 kN vs 20.9/16.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (16.5/11.2 kN vs 20.9/16.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206 shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2Z shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RSH shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RZ shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6206-C shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 22/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6206-C-2HRS shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 22/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6206-C-2Z shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 22/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206DDU shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206VV shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206ZZ shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206 shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206 shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206LLU shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206LLB shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206ZZ shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6206-2RS", "W 6206-2RS1" ], "locale_variants": {} }, { "sku": "W6206-ZZ", "brand": "SKF", "manufacturer_designation": "W 6206-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.48, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 196, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6206 carries code 06 = 30 mm (code × 5). Envelope 30×62×16 mm (1.181×2.441×0.63 in), C 16.5 kN, C0 11.2 kN, Pu 0.48 kN; limiting speed 13000 r/min and mass 196 g. SKF spells the double shield W 6206-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6206-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6206-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6206-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6206-ZZ is quoted at C 16.5 kN versus the 16 mm-wide 52100 version — do not swap on dimensions alone.", "Deep-groove geometry tolerates only minutes of misalignment; if the 62 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6206-ZZ.", "Fillet radii must clear the W6206-ZZ chamfer so the 16 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6206-ZZ?", "a": "SKF W 6206-2Z measures 30×62×16 mm (1.181×2.441×0.63 in), about 196 g, C 16.5 kN." }, { "q": "What does the W in W 6206-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6206-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6206-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×16 mm envelope and equivalent catalogue ratings; W 6206-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×16 mm envelope and equivalent catalogue ratings; W 6206 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (16.5/11.2 kN vs 20.9/16.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (16.5/11.2 kN vs 20.9/16.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206 shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2Z shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RSH shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RZ shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6206-C shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 22/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6206-C-2HRS shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 22/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6206-C-2Z shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 22/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206DDU shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206VV shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206ZZ shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206 shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206 shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206LLU shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206LLB shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206ZZ shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6206-ZZ", "W 6206-2Z" ], "locale_variants": {} }, { "sku": "W6206", "brand": "SKF", "manufacturer_designation": "W 6206", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.48, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 186, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6206 carries code 06 = 30 mm (code × 5). Envelope 30×62×16 mm (1.181×2.441×0.63 in), C 16.5 kN, C0 11.2 kN, Pu 0.48 kN; limiting speed 16000 r/min and mass 186 g. The open W 6206 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6206 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6206 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6206 is quoted at C 16.5 kN versus the 16 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6206; standard fill is industrial grease unless specified otherwise.", "Assign interference to the rotating ring: on a conventional shaft-mounted 30 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Do not preload W6206 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of the stainless W6206?", "a": "SKF W 6206 measures 30×62×16 mm (1.181×2.441×0.63 in), about 186 g, C 16.5 kN." }, { "q": "What does the W in W 6206 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6206; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6206?", "a": "The envelope matches, but stainless rates lower (C 16.5 kN for W 6206); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×16 mm envelope and equivalent catalogue ratings; W 6206-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×16 mm envelope and equivalent catalogue ratings; W 6206-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (16.5/11.2 kN vs 20.9/16.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (16.5/11.2 kN vs 20.9/16.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206 shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2Z shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RSH shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RZ shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 20.3/11.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6206-C shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 22/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6206-C-2HRS shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 22/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6206-C-2Z shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 22/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206DDU shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206VV shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206ZZ shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6206 shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.4/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206 shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206LLU shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206LLB shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6206ZZ shares the 30×62×16 mm envelope but carries different catalogue ratings (16.5/11.2 kN vs 21.6/11.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6206", "W 6206" ], "locale_variants": {} }, { "sku": "W6306-2RS", "brand": "SKF", "manufacturer_designation": "W 6306-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 15, "fatigue_load_limit_kN": 0.64, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 346, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6306 carries code 06 = 30 mm (code × 5). Envelope 30×72×19 mm (1.181×2.835×0.748 in), C 22.9 kN, C0 15 kN, Pu 0.64 kN; limiting speed 6300 r/min and mass 346 g. SKF catalogues the sealed execution as W 6306-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W6306-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6306-2RS is quoted at C 22.9 kN versus the 19 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6306-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6306-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Mount by heating the inner ring (max 120 °C) — driving W6306-2RS home through the outer ring or balls brinells the raceways.", "Mount by heating the inner ring (max 120 °C) — driving W6306-2RS home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W6306-2RS?", "a": "SKF W 6306-2RS1 measures 30×72×19 mm (1.181×2.835×0.748 in), about 346 g, C 22.9 kN." }, { "q": "What does the W in W 6306-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6306-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6306-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 30×72×19 mm envelope and equivalent catalogue ratings; W 6306-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "full", "note": "Same 30×72×19 mm envelope and equivalent catalogue ratings; W 6306 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15 kN vs 29.7/21.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15 kN vs 29.7/21.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306 shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2Z shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RSH shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RZ shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6306-C shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 32/16.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6306-C-2HRS shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 32/16.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6306-C-2Z shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 32/16.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306DDU shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306VV shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306ZZ shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306 shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306 shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306LLU shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306LLB shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306ZZ shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6306-2RS", "W 6306-2RS1" ], "locale_variants": {} }, { "sku": "W6306-ZZ", "brand": "SKF", "manufacturer_designation": "W 6306-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 15, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 345, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6306 carries code 06 = 30 mm (code × 5). Envelope 30×72×19 mm (1.181×2.835×0.748 in), C 22.9 kN, C0 15 kN, Pu 0.64 kN; limiting speed 11000 r/min and mass 345 g. SKF spells the double shield W 6306-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6306-ZZ is quoted at C 22.9 kN versus the 19 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6306-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6306-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6306-ZZ inside the quoted grease temperature range.", "Catalogue ratings for W6306-ZZ (C 22.9 kN, C0 15 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6306-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W6306-ZZ?", "a": "SKF W 6306-2Z measures 30×72×19 mm (1.181×2.835×0.748 in), about 345 g, C 22.9 kN." }, { "q": "What does the W in W 6306-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6306-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6306-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 30×72×19 mm envelope and equivalent catalogue ratings; W 6306-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "full", "note": "Same 30×72×19 mm envelope and equivalent catalogue ratings; W 6306 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15 kN vs 29.7/21.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15 kN vs 29.7/21.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306 shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2Z shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RSH shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RZ shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6306-C shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 32/16.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6306-C-2HRS shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 32/16.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6306-C-2Z shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 32/16.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306DDU shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306VV shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306ZZ shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306 shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306 shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306LLU shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306LLB shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306ZZ shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6306-ZZ", "W 6306-2Z" ], "locale_variants": {} }, { "sku": "W6306", "brand": "SKF", "manufacturer_designation": "W 6306", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 15, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 331, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6306 carries code 06 = 30 mm (code × 5). Envelope 30×72×19 mm (1.181×2.835×0.748 in), C 22.9 kN, C0 15 kN, Pu 0.64 kN; limiting speed 14000 r/min and mass 331 g. The open W 6306 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6306 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6306 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6306 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6306 is quoted at C 22.9 kN versus the 19 mm-wide 52100 version — do not swap on dimensions alone.", "Fillet radii must clear the W6306 chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Deep-groove geometry tolerates only minutes of misalignment; if the 72 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6306." ], "faq": [ { "q": "What are the dimensions of the stainless W6306?", "a": "SKF W 6306 measures 30×72×19 mm (1.181×2.835×0.748 in), about 331 g, C 22.9 kN." }, { "q": "What does the W in W 6306 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6306?", "a": "The envelope matches, but stainless rates lower (C 22.9 kN for W 6306); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 30×72×19 mm envelope and equivalent catalogue ratings; W 6306-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 30×72×19 mm envelope and equivalent catalogue ratings; W 6306-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15 kN vs 29.7/21.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15 kN vs 29.7/21.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306 shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2Z shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RSH shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RZ shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.6/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6306-C shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 32/16.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6306-C-2HRS shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 32/16.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6306-C-2Z shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 32/16.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306DDU shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306VV shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306ZZ shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6306 shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.3/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306 shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306LLU shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306LLB shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6306ZZ shares the 30×72×19 mm envelope but carries different catalogue ratings (22.9/15 kN vs 29.5/15 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6306", "W 6306" ], "locale_variants": {} }, { "sku": "W61807-2RS", "brand": "SKF", "manufacturer_designation": "W 61807-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.71, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 30, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, the last two digits encode the bore: 61807 carries code 07 = 35 mm (code × 5). Envelope 35×47×7 mm (1.378×1.85×0.276 in), C 3.71 kN, C0 3.35 kN, Pu 0.14 kN; limiting speed 8500 r/min and mass 30 g. SKF catalogues the sealed execution as W 61807-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61807-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61807-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61807-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61807-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 61807-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Assign interference to the rotating ring: on a conventional shaft-mounted 35 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W61807-2RS?", "a": "SKF W 61807-2RS1 measures 35×47×7 mm (1.378×1.85×0.276 in), about 30 g, C 3.71 kN." }, { "q": "What does the W in W 61807-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W61807-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W61807-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "61807", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61807 shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 4.36/3.35 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61807-2RS1 shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 4.36/3.35 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61807-2RZ shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 4.36/3.35 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61807 shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 4.74/3.82 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61807-2RSR shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 4.74/3.82 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61807-2Z shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 4.74/3.82 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6807DD shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 5.4/4.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6807VV shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 5.4/4.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6807ZZ shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 5.4/4.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6807 shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 5.4/4.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6807JR shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 5.45/4.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6807JRLLU shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 5.45/4.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6807JRLLB shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 5.45/4.05 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61807-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6807JRZZ shares the 35×47×7 mm envelope but carries different catalogue ratings (3.71/3.35 kN vs 5.45/4.05 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61807-2RS", "W 61807-2RS1" ], "locale_variants": {} }, { "sku": "W61907-2RS", "brand": "SKF", "manufacturer_designation": "W 61907-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.36, "static_load_kN": 7.65, "fatigue_load_limit_kN": 0.325, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 74, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, the last two digits encode the bore: 61907 carries code 07 = 35 mm (code × 5). Envelope 35×55×10 mm (1.378×2.165×0.394 in), C 9.36 kN, C0 7.65 kN, Pu 0.325 kN; limiting speed 7500 r/min and mass 74 g. SKF catalogues the sealed execution as W 61907-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W61907-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61907-2RS is quoted at C 9.36 kN versus the 10 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61907-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61907-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Fillet radii must clear the W61907-2RS chamfer so the 10 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W61907-2RS?", "a": "SKF W 61907-2RS1 measures 35×55×10 mm (1.378×2.165×0.394 in), about 74 g, C 9.36 kN." }, { "q": "What does the W in W 61907-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W61907-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W61907-2RS?", "a": "The envelope matches, but stainless rates lower (C 9.36 kN for W 61907-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "61907", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61907 shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61907-2RS1 shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61907-2RZ shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.8/7.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61907 shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.9/7.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61907-2RSR shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.9/7.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61907-2Z shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.9/7.75 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6907DDU shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 11.6/7.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6907VV shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 11.6/7.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6907ZZ shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 11.6/7.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6907 shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 11.6/7.25 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6907 shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.6/6.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6907LLU shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.6/6.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6907LLB shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.6/6.85 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61907-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6907ZZ shares the 35×55×10 mm envelope but carries different catalogue ratings (9.36/7.65 kN vs 10.6/6.85 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61907-2RS", "W 61907-2RS1" ], "locale_variants": {} }, { "sku": "W6007-2RS", "brand": "SKF", "manufacturer_designation": "W 6007-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 147, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6007 carries code 07 = 35 mm (code × 5). Envelope 35×62×14 mm (1.378×2.441×0.551 in), C 13.8 kN, C0 10.2 kN, Pu 0.44 kN; limiting speed 6700 r/min and mass 147 g. SKF catalogues the sealed execution as W 6007-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6007-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6007-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6007-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6007-2RS is not marine-grade stainless.", "Assign interference to the rotating ring: on a conventional shaft-mounted 35 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Mount by heating the inner ring (max 120 °C) — driving W6007-2RS home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W6007-2RS?", "a": "SKF W 6007-2RS1 measures 35×62×14 mm (1.378×2.441×0.551 in), about 147 g, C 13.8 kN." }, { "q": "What does the W in W 6007-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6007-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6007-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 35×62×14 mm envelope and equivalent catalogue ratings; W 6007-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "full", "note": "Same 35×62×14 mm envelope and equivalent catalogue ratings; W 6007 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007-2Z shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007-2RS1 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007-2RZ shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6007-C shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.5/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6007-C-2HRS shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.5/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6007-C-2Z shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.5/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007DDU shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007VV shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007ZZ shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007LLU shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007LLB shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007ZZ shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6007-2RS", "W 6007-2RS1" ], "locale_variants": {} }, { "sku": "W6007-ZZ", "brand": "SKF", "manufacturer_designation": "W 6007-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 148, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6007 carries code 07 = 35 mm (code × 5). Envelope 35×62×14 mm (1.378×2.441×0.551 in), C 13.8 kN, C0 10.2 kN, Pu 0.44 kN; limiting speed 12000 r/min and mass 148 g. SKF spells the double shield W 6007-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6007-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6007-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6007-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6007-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Catalogue ratings for W6007-ZZ (C 13.8 kN, C0 10.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "Assign interference to the rotating ring: on a conventional shaft-mounted 35 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6007-ZZ?", "a": "SKF W 6007-2Z measures 35×62×14 mm (1.378×2.441×0.551 in), about 148 g, C 13.8 kN." }, { "q": "What does the W in W 6007-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6007-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6007-ZZ?", "a": "The envelope matches, but stainless rates lower (C 13.8 kN for W 6007-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 35×62×14 mm envelope and equivalent catalogue ratings; W 6007-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "full", "note": "Same 35×62×14 mm envelope and equivalent catalogue ratings; W 6007 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007-2Z shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007-2RS1 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007-2RZ shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6007-C shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.5/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6007-C-2HRS shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.5/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6007-C-2Z shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.5/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007DDU shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007VV shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007ZZ shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007LLU shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007LLB shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007ZZ shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6007-ZZ", "W 6007-2Z" ], "locale_variants": {} }, { "sku": "W6007", "brand": "SKF", "manufacturer_designation": "W 6007", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 138, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6007 carries code 07 = 35 mm (code × 5). Envelope 35×62×14 mm (1.378×2.441×0.551 in), C 13.8 kN, C0 10.2 kN, Pu 0.44 kN; limiting speed 15000 r/min and mass 138 g. The open W 6007 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6007 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6007 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6007 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6007 is quoted at C 13.8 kN versus the 14 mm-wide 52100 version — do not swap on dimensions alone.", "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Do not preload W6007 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of the stainless W6007?", "a": "SKF W 6007 measures 35×62×14 mm (1.378×2.441×0.551 in), about 138 g, C 13.8 kN." }, { "q": "What does the W in W 6007 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6007?", "a": "The envelope matches, but stainless rates lower (C 13.8 kN for W 6007); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 35×62×14 mm envelope and equivalent catalogue ratings; W 6007-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 35×62×14 mm envelope and equivalent catalogue ratings; W 6007-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007-2Z shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007-2RS1 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6007-2RZ shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 16.8/10.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6007-C shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.5/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6007-C-2HRS shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.5/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6007-C-2Z shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.5/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007DDU shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007VV shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007ZZ shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6007 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.6/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007 shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007LLU shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007LLB shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6007ZZ shares the 35×62×14 mm envelope but carries different catalogue ratings (13.8/10.2 kN vs 17.7/10.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6007", "W 6007" ], "locale_variants": {} }, { "sku": "W6207-2RS", "brand": "SKF", "manufacturer_designation": "W 6207-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.1, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 276, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6207 carries code 07 = 35 mm (code × 5). Envelope 35×72×17 mm (1.378×2.835×0.669 in), C 22.1 kN, C0 15.3 kN, Pu 0.655 kN; limiting speed 6000 r/min and mass 276 g. SKF catalogues the sealed execution as W 6207-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6207-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6207-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6207-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6207-2RS is quoted at C 22.1 kN versus the 17 mm-wide 52100 version — do not swap on dimensions alone.", "Fillet radii must clear the W6207-2RS chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 0.655 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6207-2RS?", "a": "SKF W 6207-2RS1 measures 35×72×17 mm (1.378×2.835×0.669 in), about 276 g, C 22.1 kN." }, { "q": "What does the W in W 6207-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6207-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6207-2RS?", "a": "The envelope matches, but stainless rates lower (C 22.1 kN for W 6207-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×17 mm envelope and equivalent catalogue ratings; W 6207-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×17 mm envelope and equivalent catalogue ratings; W 6207 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.1/15.3 kN vs 27.5/22 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.1/15.3 kN vs 27.5/22 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207 shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 27/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2Z shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 27/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2RSH shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 27/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6207-C shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28/15.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6207-C-2HRS shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28/15.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6207-C-2Z shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28/15.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207DDU shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207VV shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207ZZ shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207 shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207 shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207LLU shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207LLB shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207ZZ shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6207-2RS", "W 6207-2RS1" ], "locale_variants": {} }, { "sku": "W6207-ZZ", "brand": "SKF", "manufacturer_designation": "W 6207-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.1, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 277, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6207 carries code 07 = 35 mm (code × 5). Envelope 35×72×17 mm (1.378×2.835×0.669 in), C 22.1 kN, C0 15.3 kN, Pu 0.655 kN; limiting speed 11000 r/min and mass 277 g. SKF spells the double shield W 6207-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6207-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6207-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6207-ZZ is quoted at C 22.1 kN versus the 17 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6207-ZZ; standard fill is industrial grease unless specified otherwise.", "The fatigue load limit is 0.655 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Fillet radii must clear the W6207-ZZ chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6207-ZZ?", "a": "SKF W 6207-2Z measures 35×72×17 mm (1.378×2.835×0.669 in), about 277 g, C 22.1 kN." }, { "q": "What does the W in W 6207-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6207-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6207-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×17 mm envelope and equivalent catalogue ratings; W 6207-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×17 mm envelope and equivalent catalogue ratings; W 6207 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.1/15.3 kN vs 27.5/22 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.1/15.3 kN vs 27.5/22 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207 shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 27/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2Z shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 27/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2RSH shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 27/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6207-C shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28/15.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6207-C-2HRS shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28/15.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6207-C-2Z shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28/15.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207DDU shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207VV shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207ZZ shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207 shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207 shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207LLU shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207LLB shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207ZZ shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6207-ZZ", "W 6207-2Z" ], "locale_variants": {} }, { "sku": "W6207", "brand": "SKF", "manufacturer_designation": "W 6207", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.1, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 262, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6207 carries code 07 = 35 mm (code × 5). Envelope 35×72×17 mm (1.378×2.835×0.669 in), C 22.1 kN, C0 15.3 kN, Pu 0.655 kN; limiting speed 14000 r/min and mass 262 g. The open W 6207 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6207 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6207 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6207 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6207 is quoted at C 22.1 kN versus the 17 mm-wide 52100 version — do not swap on dimensions alone.", "Deep-groove geometry tolerates only minutes of misalignment; if the 72 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6207.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6207-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W6207?", "a": "SKF W 6207 measures 35×72×17 mm (1.378×2.835×0.669 in), about 262 g, C 22.1 kN." }, { "q": "What does the W in W 6207 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6207?", "a": "The envelope matches, but stainless rates lower (C 22.1 kN for W 6207); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×17 mm envelope and equivalent catalogue ratings; W 6207-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×17 mm envelope and equivalent catalogue ratings; W 6207-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.1/15.3 kN vs 27.5/22 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.1/15.3 kN vs 27.5/22 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207 shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 27/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2Z shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 27/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2RSH shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 27/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6207-C shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28/15.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6207-C-2HRS shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28/15.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6207-C-2Z shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28/15.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207DDU shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207VV shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207ZZ shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6207 shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.2/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207 shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207LLU shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207LLB shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6207ZZ shares the 35×72×17 mm envelope but carries different catalogue ratings (22.1/15.3 kN vs 28.4/15.3 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6207", "W 6207" ], "locale_variants": {} }, { "sku": "W6307-2RS", "brand": "SKF", "manufacturer_designation": "W 6307-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.6, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 441, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6307 carries code 07 = 35 mm (code × 5). Envelope 35×80×21 mm (1.378×3.15×0.827 in), C 28.6 kN, C0 19 kN, Pu 0.815 kN; limiting speed 5600 r/min and mass 441 g. SKF catalogues the sealed execution as W 6307-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6307-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6307-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6307-2RS is quoted at C 28.6 kN versus the 21 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6307-2RS; standard fill is industrial grease unless specified otherwise.", "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.", "Assign interference to the rotating ring: on a conventional shaft-mounted 35 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6307-2RS?", "a": "SKF W 6307-2RS1 measures 35×80×21 mm (1.378×3.15×0.827 in), about 441 g, C 28.6 kN." }, { "q": "What does the W in W 6307-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6307-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6307-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "6307-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.6/19 kN vs 35.1/19 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "307", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.6/19 kN vs 34.7/26.5 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.6/19 kN vs 34.7/26.5 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6307", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6307 shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 35.1/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6307-2Z shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 35.1/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6307-2RSH shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 35.1/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6307-C shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 37/19.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6307-C-2HRS shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 37/19.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6307-C-2Z shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 37/19.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6307DDU shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 36.5/19.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6307VV shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 36.5/19.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6307ZZ shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 36.5/19.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6307 shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 36.5/19.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6307 shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 37/19.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6307LLU shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 37/19.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6307LLB shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 37/19.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6307ZZ shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 37/19.1 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6307-2RS", "W 6307-2RS1" ], "locale_variants": {} }, { "sku": "W61908-2RS", "brand": "SKF", "manufacturer_designation": "W 61908-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 9.8, "fatigue_load_limit_kN": 0.425, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 107, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, the last two digits encode the bore: 61908 carries code 08 = 40 mm (code × 5). Envelope 40×62×12 mm (1.575×2.441×0.472 in), C 11.9 kN, C0 9.8 kN, Pu 0.425 kN; limiting speed 6700 r/min and mass 107 g. SKF catalogues the sealed execution as W 61908-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61908-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W61908-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61908-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61908-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "The fatigue load limit is 0.425 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Deep-groove geometry tolerates only minutes of misalignment; if the 62 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61908-2RS." ], "faq": [ { "q": "What are the dimensions of the stainless W61908-2RS?", "a": "SKF W 61908-2RS1 measures 40×62×12 mm (1.575×2.441×0.472 in), about 107 g, C 11.9 kN." }, { "q": "What does the W in W 61908-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W61908-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W61908-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "61908", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61908 shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 13.8/10 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61908-2RS1 shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 13.8/10 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61908-2RZ shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 13.8/10 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61908 shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 14.5/9.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61908-2RSR shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 14.5/9.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6908DDU shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 15/10 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6908VV shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 15/10 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6908ZZ shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 15/10 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6908 shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 15/10 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6908 shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 13.5/8.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6908LLU shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 13.5/8.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6908LLB shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 13.5/8.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61908-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6908ZZ shares the 40×62×12 mm envelope but carries different catalogue ratings (11.9/9.8 kN vs 13.5/8.9 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61908-2RS", "W 61908-2RS1" ], "locale_variants": {} }, { "sku": "W6008-2RS", "brand": "SKF", "manufacturer_designation": "W 6008-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.6, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 182, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6008 carries code 08 = 40 mm (code × 5). Envelope 40×68×15 mm (1.575×2.677×0.591 in), C 14.6 kN, C0 11.4 kN, Pu 0.49 kN; limiting speed 6300 r/min and mass 182 g. SKF catalogues the sealed execution as W 6008-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6008-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6008-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6008-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6008-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Fillet radii must clear the W6008-2RS chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Assign interference to the rotating ring: on a conventional shaft-mounted 40 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6008-2RS?", "a": "SKF W 6008-2RS1 measures 40×68×15 mm (1.575×2.677×0.591 in), about 182 g, C 14.6 kN." }, { "q": "What does the W in W 6008-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6008-2RS?", "a": "The envelope matches, but stainless rates lower (C 14.6 kN for W 6008-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 40×68×15 mm envelope and equivalent catalogue ratings; W 6008-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "full", "note": "Same 40×68×15 mm envelope and equivalent catalogue ratings; W 6008 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008-2Z shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008-2RS1 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008-2RZ shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6008-2RSR shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6008-2Z shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008DDU shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008VV shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008ZZ shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008LLU shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008LLB shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008ZZ shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6008-2RS", "W 6008-2RS1" ], "locale_variants": {} }, { "sku": "W6008-ZZ", "brand": "SKF", "manufacturer_designation": "W 6008-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.6, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 183, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6008 carries code 08 = 40 mm (code × 5). Envelope 40×68×15 mm (1.575×2.677×0.591 in), C 14.6 kN, C0 11.4 kN, Pu 0.49 kN; limiting speed 11000 r/min and mass 183 g. SKF spells the double shield W 6008-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6008-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6008-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6008-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6008-ZZ is not marine-grade stainless.", "Do not preload W6008-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Assign interference to the rotating ring: on a conventional shaft-mounted 40 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6008-ZZ?", "a": "SKF W 6008-2Z measures 40×68×15 mm (1.575×2.677×0.591 in), about 183 g, C 14.6 kN." }, { "q": "What does the W in W 6008-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6008-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6008-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 40×68×15 mm envelope and equivalent catalogue ratings; W 6008-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "full", "note": "Same 40×68×15 mm envelope and equivalent catalogue ratings; W 6008 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008-2Z shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008-2RS1 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008-2RZ shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6008-2RSR shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6008-2Z shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008DDU shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008VV shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008ZZ shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008LLU shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008LLB shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008ZZ shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6008-ZZ", "W 6008-2Z" ], "locale_variants": {} }, { "sku": "W6008", "brand": "SKF", "manufacturer_designation": "W 6008", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.6, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 172, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6008 carries code 08 = 40 mm (code × 5). Envelope 40×68×15 mm (1.575×2.677×0.591 in), C 14.6 kN, C0 11.4 kN, Pu 0.49 kN; limiting speed 14000 r/min and mass 172 g. The open W 6008 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6008 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6008 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6008 is quoted at C 14.6 kN versus the 15 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6008; standard fill is industrial grease unless specified otherwise.", "The fatigue load limit is 0.49 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Assign interference to the rotating ring: on a conventional shaft-mounted 40 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of the stainless W6008?", "a": "SKF W 6008 measures 40×68×15 mm (1.575×2.677×0.591 in), about 172 g, C 14.6 kN." }, { "q": "What does the W in W 6008 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6008; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6008?", "a": "The envelope matches, but stainless rates lower (C 14.6 kN for W 6008); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 40×68×15 mm envelope and equivalent catalogue ratings; W 6008-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 40×68×15 mm envelope and equivalent catalogue ratings; W 6008-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008-2Z shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008-2RS1 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6008-2RZ shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6008-2RSR shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6008-2Z shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 17.8/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008DDU shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008VV shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008ZZ shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.4/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008 shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008LLU shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008LLB shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6008ZZ shares the 40×68×15 mm envelope but carries different catalogue ratings (14.6/11.4 kN vs 18.6/11.5 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6008", "W 6008" ], "locale_variants": {} }, { "sku": "W6208-2RS", "brand": "SKF", "manufacturer_designation": "W 6208-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.75, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 359, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6208 carries code 08 = 40 mm (code × 5). Envelope 40×80×18 mm (1.575×3.15×0.709 in), C 25.1 kN, C0 17.6 kN, Pu 0.75 kN; limiting speed 5600 r/min and mass 359 g. SKF catalogues the sealed execution as W 6208-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6208-2RS is quoted at C 25.1 kN versus the 18 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6208-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6208-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6208-2RS inside the quoted grease temperature range.", "Do not preload W6208-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Deep-groove geometry tolerates only minutes of misalignment; if the 80 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6208-2RS." ], "faq": [ { "q": "What are the dimensions of the stainless W6208-2RS?", "a": "SKF W 6208-2RS1 measures 40×80×18 mm (1.575×3.15×0.709 in), about 359 g, C 25.1 kN." }, { "q": "What does the W in W 6208-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6208-2RS?", "a": "The envelope matches, but stainless rates lower (C 25.1 kN for W 6208-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope and equivalent catalogue ratings; W 6208-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope and equivalent catalogue ratings; W 6208 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (25.1/17.6 kN vs 33.6/27 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (25.1/17.6 kN vs 33.6/27 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208 shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2Z shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RSH shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RZ shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6208-C shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 31.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6208-C-2HRS shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 31.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6208-C-2Z shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 31.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208DDU shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208VV shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208ZZ shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208 shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208 shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208LLU shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208LLB shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208ZZ shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6208-2RS", "W 6208-2RS1" ], "locale_variants": {} }, { "sku": "W6208-ZZ", "brand": "SKF", "manufacturer_designation": "W 6208-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.75, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 359, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6208 carries code 08 = 40 mm (code × 5). Envelope 40×80×18 mm (1.575×3.15×0.709 in), C 25.1 kN, C0 17.6 kN, Pu 0.75 kN; limiting speed 10000 r/min and mass 359 g. SKF spells the double shield W 6208-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W6208-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6208-ZZ is quoted at C 25.1 kN versus the 18 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6208-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6208-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Mount by heating the inner ring (max 120 °C) — driving W6208-ZZ home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 0.75 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6208-ZZ?", "a": "SKF W 6208-2Z measures 40×80×18 mm (1.575×3.15×0.709 in), about 359 g, C 25.1 kN." }, { "q": "What does the W in W 6208-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6208-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6208-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope and equivalent catalogue ratings; W 6208-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope and equivalent catalogue ratings; W 6208 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (25.1/17.6 kN vs 33.6/27 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (25.1/17.6 kN vs 33.6/27 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208 shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2Z shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RSH shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RZ shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6208-C shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 31.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6208-C-2HRS shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 31.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6208-C-2Z shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 31.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208DDU shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208VV shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208ZZ shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208 shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208 shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208LLU shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208LLB shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208ZZ shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6208-ZZ", "W 6208-2Z" ], "locale_variants": {} }, { "sku": "W6208", "brand": "SKF", "manufacturer_designation": "W 6208", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.75, "reference_speed_rpm": 20000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 342, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6208 carries code 08 = 40 mm (code × 5). Envelope 40×80×18 mm (1.575×3.15×0.709 in), C 25.1 kN, C0 17.6 kN, Pu 0.75 kN; limiting speed 12000 r/min and mass 342 g. The open W 6208 carries no shields or seals and relies on application lubrication and external sealing. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6208 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6208 inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6208 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6208 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Fillet radii must clear the W6208 chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload W6208 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of the stainless W6208?", "a": "SKF W 6208 measures 40×80×18 mm (1.575×3.15×0.709 in), about 342 g, C 25.1 kN." }, { "q": "What does the W in W 6208 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6208; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6208?", "a": "The envelope matches, but stainless rates lower (C 25.1 kN for W 6208); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope and equivalent catalogue ratings; W 6208-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope and equivalent catalogue ratings; W 6208-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (25.1/17.6 kN vs 33.6/27 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (25.1/17.6 kN vs 33.6/27 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208 shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2Z shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RSH shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RZ shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/19 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6208-C shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 31.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6208-C-2HRS shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 31.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6208-C-2Z shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 31.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208DDU shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208VV shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208ZZ shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6208 shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32/17.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208 shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208LLU shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208LLB shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6208ZZ shares the 40×80×18 mm envelope but carries different catalogue ratings (25.1/17.6 kN vs 32.5/17.8 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6208", "W 6208" ], "locale_variants": {} }, { "sku": "W61909-2RS", "brand": "SKF", "manufacturer_designation": "W 61909-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.1, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 125, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, the last two digits encode the bore: 61909 carries code 09 = 45 mm (code × 5). Envelope 45×68×12 mm (1.772×2.677×0.472 in), C 12.1 kN, C0 10.8 kN, Pu 0.465 kN; limiting speed 6000 r/min and mass 125 g. SKF catalogues the sealed execution as W 61909-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W61909-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61909-2RS is quoted at C 12.1 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61909-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61909-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Do not preload W61909-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Deep-groove geometry tolerates only minutes of misalignment; if the 68 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61909-2RS." ], "faq": [ { "q": "What are the dimensions of the stainless W61909-2RS?", "a": "SKF W 61909-2RS1 measures 45×68×12 mm (1.772×2.677×0.472 in), about 125 g, C 12.1 kN." }, { "q": "What does the W in W 61909-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61909-2RS?", "a": "The envelope matches, but stainless rates lower (C 12.1 kN for W 61909-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "61909", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61909 shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14/10.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61909-2RS1 shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14/10.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61909-2RZ shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14/10.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6909DDU shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 15.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6909VV shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 15.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6909ZZ shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 15.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6909 shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 15.5/10.9 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6909 shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14.5/10.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6909LLU shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14.5/10.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6909LLB shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14.5/10.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61909-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6909ZZ shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14.5/10.4 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61909-2RS", "W 61909-2RS1" ], "locale_variants": {} }, { "sku": "W6009-2RS", "brand": "SKF", "manufacturer_designation": "W 6009-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 18.2, "static_load_kN": 15, "fatigue_load_limit_kN": 0.64, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 236, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6009 carries code 09 = 45 mm (code × 5). Envelope 45×75×16 mm (1.772×2.953×0.63 in), C 18.2 kN, C0 15 kN, Pu 0.64 kN; limiting speed 5600 r/min and mass 236 g. SKF catalogues the sealed execution as W 6009-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "The stainless steel is martensitic and MAGNETIC; do not reject W6009-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6009-2RS is quoted at C 18.2 kN versus the 16 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6009-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6009-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Deep-groove geometry tolerates only minutes of misalignment; if the 75 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6009-2RS.", "At 45 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of the stainless W6009-2RS?", "a": "SKF W 6009-2RS1 measures 45×75×16 mm (1.772×2.953×0.63 in), about 236 g, C 18.2 kN." }, { "q": "What does the W in W 6009-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6009-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6009-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 45×75×16 mm envelope and equivalent catalogue ratings; W 6009-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6009", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6009 shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 22.1/14.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6009-2Z shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 22.1/14.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6009-2RS1 shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 22.1/14.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6009DDU shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23/15.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6009VV shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23/15.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6009ZZ shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23/15.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6009 shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23/15.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6009 shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23.2/15.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6009LLU shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23.2/15.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6009LLB shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23.2/15.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6009ZZ shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23.2/15.1 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6009-2RS", "W 6009-2RS1" ], "locale_variants": {} }, { "sku": "W6009-ZZ", "brand": "SKF", "manufacturer_designation": "W 6009-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 18.2, "static_load_kN": 15, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 237, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6009 carries code 09 = 45 mm (code × 5). Envelope 45×75×16 mm (1.772×2.953×0.63 in), C 18.2 kN, C0 15 kN, Pu 0.64 kN; limiting speed 10000 r/min and mass 237 g. SKF spells the double shield W 6009-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "small pumps handling corrosive media", "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6009-ZZ is quoted at C 18.2 kN versus the 16 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6009-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6009-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6009-ZZ inside the quoted grease temperature range.", "Fillet radii must clear the W6009-ZZ chamfer so the 16 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 0.64 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W6009-ZZ?", "a": "SKF W 6009-2Z measures 45×75×16 mm (1.772×2.953×0.63 in), about 237 g, C 18.2 kN." }, { "q": "What does the W in W 6009-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "What grease is supplied in W6009-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6009-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 45×75×16 mm envelope and equivalent catalogue ratings; W 6009-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6009", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6009 shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 22.1/14.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6009-2Z shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 22.1/14.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6009-2RS1 shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 22.1/14.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6009DDU shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23/15.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6009VV shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23/15.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6009ZZ shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23/15.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6009 shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23/15.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6009 shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23.2/15.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6009LLU shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23.2/15.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6009LLB shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23.2/15.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6009-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6009ZZ shares the 45×75×16 mm envelope but carries different catalogue ratings (18.2/15 kN vs 23.2/15.1 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6009-ZZ", "W 6009-2Z" ], "locale_variants": {} }, { "sku": "W6209-2RS", "brand": "SKF", "manufacturer_designation": "W 6209-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 0.865, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 395, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6209 carries code 09 = 45 mm (code × 5). Envelope 45×85×19 mm (1.772×3.346×0.748 in), C 28.1 kN, C0 20.4 kN, Pu 0.865 kN; limiting speed 5000 r/min and mass 395 g. SKF catalogues the sealed execution as W 6209-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6209-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6209-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6209-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6209-2RS is not marine-grade stainless.", "Catalogue ratings for W6209-2RS (C 28.1 kN, C0 20.4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.", "At 45 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of the stainless W6209-2RS?", "a": "SKF W 6209-2RS1 measures 45×85×19 mm (1.772×3.346×0.748 in), about 395 g, C 28.1 kN." }, { "q": "What does the W in W 6209-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6209-2RS typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6209-2RS?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 45×85×19 mm envelope and equivalent catalogue ratings; W 6209-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.1/20.4 kN vs 35.2/30 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.1/20.4 kN vs 35.2/30 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209 shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 35.1/21.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209-2Z shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 35.1/21.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209-2RSH shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 35.1/21.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6209DDU shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 34.5/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6209VV shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 34.5/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6209ZZ shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 34.5/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6209 shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 34.5/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6209 shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 36/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6209LLU shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 36/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6209LLB shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 36/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6209ZZ shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 36/20.4 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6209-2RS", "W 6209-2RS1" ], "locale_variants": {} }, { "sku": "W6209-ZZ", "brand": "SKF", "manufacturer_designation": "W 6209-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 0.865, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 394, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6209 carries code 09 = 45 mm (code × 5). Envelope 45×85×19 mm (1.772×3.346×0.748 in), C 28.1 kN, C0 20.4 kN, Pu 0.865 kN; limiting speed 9000 r/min and mass 394 g. SKF spells the double shield W 6209-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6209-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6209-ZZ inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6209-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6209-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Do not preload W6209-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Catalogue ratings for W6209-ZZ (C 28.1 kN, C0 20.4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W6209-ZZ?", "a": "SKF W 6209-2Z measures 45×85×19 mm (1.772×3.346×0.748 in), about 394 g, C 28.1 kN." }, { "q": "What does the W in W 6209-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." }, { "q": "Where is W6209-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "cross_ref": [ { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 45×85×19 mm envelope and equivalent catalogue ratings; W 6209-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.1/20.4 kN vs 35.2/30 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.1/20.4 kN vs 35.2/30 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209 shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 35.1/21.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209-2Z shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 35.1/21.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209-2RSH shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 35.1/21.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6209DDU shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 34.5/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6209VV shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 34.5/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6209ZZ shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 34.5/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6209 shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 34.5/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6209 shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 36/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6209LLU shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 36/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6209LLB shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 36/20.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6209ZZ shares the 45×85×19 mm envelope but carries different catalogue ratings (28.1/20.4 kN vs 36/20.4 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6209-ZZ", "W 6209-2Z" ], "locale_variants": {} }, { "sku": "W61810-2RS", "brand": "SKF", "manufacturer_designation": "W 61810-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.07, "static_load_kN": 5.5, "fatigue_load_limit_kN": 0.236, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 51, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61800-series, the last two digits encode the bore: 61810 carries code 10 = 50 mm (code × 5). Envelope 50×65×7 mm (1.969×2.559×0.276 in), C 5.07 kN, C0 5.5 kN, Pu 0.236 kN; limiting speed 6000 r/min and mass 51 g. SKF catalogues the sealed execution as W 61810-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W61810-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61810-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61810-2RS is quoted at C 5.07 kN versus the 7 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61810-2RS; standard fill is industrial grease unless specified otherwise.", "Do not preload W61810-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The fatigue load limit is 0.236 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of the stainless W61810-2RS?", "a": "SKF W 61810-2RS1 measures 50×65×7 mm (1.969×2.559×0.276 in), about 51 g, C 5.07 kN." }, { "q": "What does the W in W 61810-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W61810-2RS?", "a": "The envelope matches, but stainless rates lower (C 5.07 kN for W 61810-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "61810", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61810 shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 6.76/6.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61810-2RS1 shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 6.76/6.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61810-2RZ shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 6.76/6.8 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6810DDU shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 7.05/6.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6810VV shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 7.05/6.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6810ZZ shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 7.05/6.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6810 shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 7.05/6.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6810JR shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 7.3/6.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6810JRLLU shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 7.3/6.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6810JRLLB shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 7.3/6.1 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61810-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6810JRZZ shares the 50×65×7 mm envelope but carries different catalogue ratings (5.07/5.5 kN vs 7.3/6.1 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W61810-2RS", "W 61810-2RS1" ], "locale_variants": {} }, { "sku": "W6010-2RS", "brand": "SKF", "manufacturer_designation": "W 6010-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.71, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 256, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6010 carries code 10 = 50 mm (code × 5). Envelope 50×80×16 mm (1.969×3.15×0.63 in), C 19 kN, C0 16.6 kN, Pu 0.71 kN; limiting speed 5000 r/min and mass 256 g. SKF catalogues the sealed execution as W 6010-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "food and beverage conveyors", "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6010-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6010-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6010-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6010-2RS is quoted at C 19 kN versus the 16 mm-wide 52100 version — do not swap on dimensions alone.", "Deep-groove geometry tolerates only minutes of misalignment; if the 80 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6010-2RS.", "Fillet radii must clear the W6010-2RS chamfer so the 16 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of the stainless W6010-2RS?", "a": "SKF W 6010-2RS1 measures 50×80×16 mm (1.969×3.15×0.63 in), about 256 g, C 19 kN." }, { "q": "What does the W in W 6010-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6010-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6010-2RS?", "a": "The envelope matches, but stainless rates lower (C 19 kN for W 6010-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 50×80×16 mm envelope and equivalent catalogue ratings; W 6010-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6010", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6010 shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 22.9/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6010-2Z shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 22.9/15.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6010-2RS1 shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 22.9/15.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6010-2RZ shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 22.9/15.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6010DDU shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6010VV shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6010ZZ shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6010 shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6010 shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24.2/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6010LLU shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24.2/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6010LLB shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24.2/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6010ZZ shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24.2/16.6 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6010-2RS", "W 6010-2RS1" ], "locale_variants": {} }, { "sku": "W6010-ZZ", "brand": "SKF", "manufacturer_designation": "W 6010-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 256, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6000-series, the last two digits encode the bore: 6010 carries code 10 = 50 mm (code × 5). Envelope 50×80×16 mm (1.969×3.15×0.63 in), C 19 kN, C0 16.6 kN, Pu 0.71 kN; limiting speed 9000 r/min and mass 256 g. SKF spells the double shield W 6010-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "chemical and marine atmospheres", "medical and laboratory devices", "small pumps handling corrosive media", "bicycle and outdoor equipment" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6010-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6010-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6010-ZZ is quoted at C 19 kN versus the 16 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6010-ZZ; standard fill is industrial grease unless specified otherwise.", "Assign interference to the rotating ring: on a conventional shaft-mounted 50 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.", "Do not preload W6010-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of the stainless W6010-ZZ?", "a": "SKF W 6010-2Z measures 50×80×16 mm (1.969×3.15×0.63 in), about 256 g, C 19 kN." }, { "q": "What does the W in W 6010-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Are W stainless bearings waterproof?", "a": "No — the stainless rings resist moisture and weak chemicals far better than 52100 chrome steel, but salt spray, strong chlorides and unlubricated washdown duty can still corrode W6010-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6010-ZZ?", "a": "The envelope matches, but stainless rates lower (C 19 kN for W 6010-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 50×80×16 mm envelope and equivalent catalogue ratings; W 6010-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6010", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6010 shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 22.9/16 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6010-2Z shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 22.9/15.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6010-2RS1 shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 22.9/15.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6010-2RZ shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 22.9/15.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6010DDU shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6010VV shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6010ZZ shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6010 shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6010 shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24.2/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6010LLU shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24.2/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6010LLB shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24.2/16.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6010ZZ shares the 50×80×16 mm envelope but carries different catalogue ratings (19/16.6 kN vs 24.2/16.6 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6010-ZZ", "W 6010-2Z" ], "locale_variants": {} }, { "sku": "W6210-2RS", "brand": "SKF", "manufacturer_designation": "W 6210-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 30.2, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 449, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6210 carries code 10 = 50 mm (code × 5). Envelope 50×90×20 mm (1.969×3.543×0.787 in), C 30.2 kN, C0 23.2 kN, Pu 0.98 kN; limiting speed 4800 r/min and mass 449 g. SKF catalogues the sealed execution as W 6210-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "bicycle and outdoor equipment", "appliances exposed to moisture", "food and beverage conveyors", "pharmaceutical and packaging machines" ], "failure_modes": [ "seal and grease failure before the rings corrode in sustained washdown service", "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "contact-seal lip hardening and pre-grease loss after long high-temperature service", "grease-life expiry inside the sealed-for-life cavity, which has no relubrication path" ], "pitfalls": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6210-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6210-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Temperatures above roughly 300 °C temper the stainless races; even standard greases fail far earlier — keep W6210-2RS inside the quoted grease temperature range.", "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6210-2RS is not marine-grade stainless.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6210-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6210-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W6210-2RS?", "a": "SKF W 6210-2RS1 measures 50×90×20 mm (1.969×3.543×0.787 in), about 449 g, C 30.2 kN." }, { "q": "What does the W in W 6210-2RS1 mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Can I replace a chrome-steel bearing with stainless W6210-2RS?", "a": "The envelope matches, but stainless rates lower (C 30.2 kN for W 6210-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." }, { "q": "Is the stainless bearing magnetic?", "a": "Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls." } ], "cross_ref": [ { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (30.2/23.2 kN vs 37.1/23.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope and equivalent catalogue ratings; W 6210-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (30.2/23.2 kN vs 39.1/34.5 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (30.2/23.2 kN vs 39.1/34.5 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210 shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 37.1/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210-2Z shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 37.1/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210-2RSH shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 37.1/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6210DDU shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 38.5/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6210VV shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 38.5/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6210ZZ shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 38.5/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6210 shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 38.5/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6210 shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 39/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6210LLU shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 39/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6210LLB shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 39/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6210ZZ shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 39/23.2 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6210-2RS", "W 6210-2RS1" ], "locale_variants": {} }, { "sku": "W6210-ZZ", "brand": "SKF", "manufacturer_designation": "W 6210-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 30.2, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 453, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6200-series, the last two digits encode the bore: 6210 carries code 10 = 50 mm (code × 5). Envelope 50×90×20 mm (1.969×3.543×0.787 in), C 30.2 kN, C0 23.2 kN, Pu 0.98 kN; limiting speed 8500 r/min and mass 453 g. SKF spells the double shield W 6210-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.", "applications": [ "pharmaceutical and packaging machines", "washdown-duty equipment", "chemical and marine atmospheres", "medical and laboratory devices" ], "failure_modes": [ "surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty", "seal and grease failure before the rings corrode in sustained washdown service", "fine-particle abrasion when non-contact shields let dust through in a dirty environment", "grease aging inside the shielded cavity with no relubrication path" ], "pitfalls": [ "W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6210-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6210-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6210-ZZ is quoted at C 30.2 kN versus the 20 mm-wide 52100 version — do not swap on dimensions alone.", "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6210-ZZ; standard fill is industrial grease unless specified otherwise.", "The fatigue load limit is 0.98 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Catalogue ratings for W6210-ZZ (C 30.2 kN, C0 23.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of the stainless W6210-ZZ?", "a": "SKF W 6210-2Z measures 50×90×20 mm (1.969×3.543×0.787 in), about 453 g, C 30.2 kN." }, { "q": "What does the W in W 6210-2Z mean?", "a": "W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules." }, { "q": "Where is W6210-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." }, { "q": "What grease is supplied in W6210-ZZ?", "a": "Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease." } ], "cross_ref": [ { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (30.2/23.2 kN vs 37.1/23.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope and equivalent catalogue ratings; W 6210-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (30.2/23.2 kN vs 39.1/34.5 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (30.2/23.2 kN vs 39.1/34.5 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210 shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 37.1/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210-2Z shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 37.1/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210-2RSH shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 37.1/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6210DDU shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 38.5/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6210VV shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 38.5/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6210ZZ shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 38.5/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6210 shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 38.5/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6210 shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 39/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6210LLU shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 39/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6210LLB shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 39/23.2 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6210ZZ shares the 50×90×20 mm envelope but carries different catalogue ratings (30.2/23.2 kN vs 39/23.2 kN) — the stainless execution is not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "W6210-ZZ", "W 6210-2Z" ], "locale_variants": {} }, { "sku": "305", "brand": "SKF", "manufacturer_designation": "305", "series": "300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "305 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 305 carries code 05 = 25 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 25×62×17 mm envelope its C 22.9 kN and C0 15.6 kN ratings (Pu 0.67 kN). The open 305 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 13000 r/min, mass 240 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 22.9/15.6 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 305 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 13000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 25×62 mm envelope, which is why 305 reaches C 22.9 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 305, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "The fatigue load limit is 0.67 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of 305?", "a": "Filling-slot bearing 305 measures 25×62×17 mm (0.984×2.441×0.669 in), about 240 g." }, { "q": "What does the designation 305 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 05 = 25 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 305 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15.6 kN vs 17.8/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15.6 kN vs 17.8/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15.6 kN vs 17.8/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 25×62×17 mm envelope and equivalent catalogue ratings; 305-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305 shares the 25×62×17 mm envelope but catalogue C/C0 differ (22.9/15.6 kN vs 23.4/11.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ (22.9/15.6 kN vs 23.4/11.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RSH shares the 25×62×17 mm envelope but catalogue C/C0 differ (22.9/15.6 kN vs 23.4/11.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RZ shares the 25×62×17 mm envelope but catalogue C/C0 differ (22.9/15.6 kN vs 23.4/11.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6305-C on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 26.5/11.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6305-C-2HRS on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 26.5/11.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6305-C-2Z on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 26.5/11.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6305DDU on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 22.6/11.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6305VV on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 22.6/11.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6305ZZ on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 22.6/11.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6305 on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 22.6/11.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6305 on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 23.5/10.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6305LLU on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 23.5/10.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6305LLB on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 23.5/10.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6305ZZ on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 23.5/10.9 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "305", "305" ], "locale_variants": {} }, { "sku": "305-ZZ", "brand": "SKF", "manufacturer_designation": "305-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10400, "max_rpm": 10400, "weight_g": 240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "305-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 305 carries code 05 = 25 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 25×62×17 mm envelope its C 22.9 kN and C0 15.6 kN ratings (Pu 0.67 kN). SKF spells the double shield 305-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 10400 r/min, mass 240 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Filling slots let more balls be packed into the 25×62 mm envelope, which is why 305-ZZ reaches C 22.9 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 305-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "305 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 305-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 22.9/15.6 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Filling slots let more balls be packed into the 25×62 mm envelope, which is why 305-ZZ reaches C 22.9 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Catalogue ratings for 305-ZZ (C 22.9 kN, C0 15.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 305-ZZ?", "a": "Filling-slot bearing 305-2Z measures 25×62×17 mm (0.984×2.441×0.669 in), about 240 g." }, { "q": "What does the designation 305 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 05 = 25 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." }, { "q": "What fails on 305-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 10400 r/min limiting speed are the typical failure modes." } ], "cross_ref": [ { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15.6 kN vs 17.8/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15.6 kN vs 17.8/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (22.9/15.6 kN vs 17.8/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "full", "note": "Same 25×62×17 mm envelope and equivalent catalogue ratings; 305 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305 shares the 25×62×17 mm envelope but catalogue C/C0 differ (22.9/15.6 kN vs 23.4/11.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ (22.9/15.6 kN vs 23.4/11.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RSH shares the 25×62×17 mm envelope but catalogue C/C0 differ (22.9/15.6 kN vs 23.4/11.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6305-2RZ shares the 25×62×17 mm envelope but catalogue C/C0 differ (22.9/15.6 kN vs 23.4/11.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6305-C on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 26.5/11.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6305-C-2HRS on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 26.5/11.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6305-C-2Z on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 26.5/11.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6305DDU on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 22.6/11.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6305VV on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 22.6/11.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6305ZZ on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 22.6/11.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6305 on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 22.6/11.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6305 on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 23.5/10.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6305LLU on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 23.5/10.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6305LLB on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 23.5/10.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6305ZZ on the same 25×62×17 mm envelope, but catalogue C/C0 differ (22.9/15.6 kN vs 23.5/10.9 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "305-ZZ", "305-2Z" ], "locale_variants": {} }, { "sku": "206", "brand": "SKF", "manufacturer_designation": "206", "series": "200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.9, "static_load_kN": 16.3, "fatigue_load_limit_kN": 0.695, "reference_speed_rpm": 20000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "206 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 206 carries code 06 = 30 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 30×62×16 mm envelope its C 20.9 kN and C0 16.3 kN ratings (Pu 0.695 kN). The open 206 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 12000 r/min, mass 210 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slew drives", "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "The slots sit at one angular position: on 206, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "206 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 206 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 20.9/16.3 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 206 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 12000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Clearance suffixes follow the seal code in the designation stack (e.g. 206-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 206?", "a": "Filling-slot bearing 206 measures 30×62×16 mm (1.181×2.441×0.63 in), about 210 g." }, { "q": "What does the designation 206 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 06 = 30 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 20.9 kN for 206). The slots also make the rings separable." }, { "q": "Can 206 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (20.9/16.3 kN vs 16.5/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (20.9/16.3 kN vs 16.5/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (20.9/16.3 kN vs 16.5/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×16 mm envelope and equivalent catalogue ratings; 206-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206 shares the 30×62×16 mm envelope but catalogue C/C0 differ (20.9/16.3 kN vs 20.3/11.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ (20.9/16.3 kN vs 20.3/11.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RSH shares the 30×62×16 mm envelope but catalogue C/C0 differ (20.9/16.3 kN vs 20.3/11.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RZ shares the 30×62×16 mm envelope but catalogue C/C0 differ (20.9/16.3 kN vs 20.3/11.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6206-C on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 22/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6206-C-2HRS on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 22/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6206-C-2Z on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 22/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6206DDU on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.4/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6206VV on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.4/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6206ZZ on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.4/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6206 on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.4/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6206 on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.6/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6206LLU on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.6/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6206LLB on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.6/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6206ZZ on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.6/11.3 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "206", "206" ], "locale_variants": {} }, { "sku": "206-ZZ", "brand": "SKF", "manufacturer_designation": "206-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.9, "static_load_kN": 16.3, "fatigue_load_limit_kN": 0.695, "reference_speed_rpm": 20000, "limiting_speed_rpm": 9600, "max_rpm": 9600, "weight_g": 210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "206-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 206 carries code 06 = 30 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 30×62×16 mm envelope its C 20.9 kN and C0 16.3 kN ratings (Pu 0.695 kN). SKF spells the double shield 206-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 9600 r/min, mass 210 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Shields on 206-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 9600 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 30×62 mm envelope, which is why 206-ZZ reaches C 20.9 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 206-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "206 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 206-2Z exactly when ordering replacements.", "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 206-ZZ?", "a": "Filling-slot bearing 206-2Z measures 30×62×16 mm (1.181×2.441×0.63 in), about 210 g." }, { "q": "What does the designation 206 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 06 = 30 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 206-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 9600 r/min limiting speed are the typical failure modes." }, { "q": "Is 206-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 206-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (20.9/16.3 kN vs 16.5/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (20.9/16.3 kN vs 16.5/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×16 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (20.9/16.3 kN vs 16.5/11.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "full", "note": "Same 30×62×16 mm envelope and equivalent catalogue ratings; 206 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206 shares the 30×62×16 mm envelope but catalogue C/C0 differ (20.9/16.3 kN vs 20.3/11.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ (20.9/16.3 kN vs 20.3/11.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RSH shares the 30×62×16 mm envelope but catalogue C/C0 differ (20.9/16.3 kN vs 20.3/11.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6206-2RZ shares the 30×62×16 mm envelope but catalogue C/C0 differ (20.9/16.3 kN vs 20.3/11.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6206-C on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 22/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6206-C-2HRS on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 22/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6206-C-2Z on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 22/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6206DDU on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.4/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6206VV on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.4/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6206ZZ on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.4/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6206 on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.4/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6206 on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.6/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6206LLU on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.6/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6206LLB on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.6/11.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6206ZZ on the same 30×62×16 mm envelope, but catalogue C/C0 differ (20.9/16.3 kN vs 21.6/11.3 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "206-ZZ", "206-2Z" ], "locale_variants": {} }, { "sku": "306", "brand": "SKF", "manufacturer_designation": "306", "series": "300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.7, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.93, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "306 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 306 carries code 06 = 30 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 30×72×19 mm envelope its C 29.7 kN and C0 21.6 kN ratings (Pu 0.93 kN). The open 306 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 11000 r/min, mass 370 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "306 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 306 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 29.7/21.6 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 306 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 11000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Shields on 306 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Fillet radii must clear the 306 chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 306?", "a": "Filling-slot bearing 306 measures 30×72×19 mm (1.181×2.835×0.748 in), about 370 g." }, { "q": "What does the designation 306 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 06 = 30 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." }, { "q": "What fails on 306?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 11000 r/min limiting speed are the typical failure modes." } ], "cross_ref": [ { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (29.7/21.6 kN vs 22.9/15 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (29.7/21.6 kN vs 22.9/15 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (29.7/21.6 kN vs 22.9/15 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 30×72×19 mm envelope and equivalent catalogue ratings; 306-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306 shares the 30×72×19 mm envelope but catalogue C/C0 differ (29.7/21.6 kN vs 29.6/16 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ (29.7/21.6 kN vs 29.6/16 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RSH shares the 30×72×19 mm envelope but catalogue C/C0 differ (29.7/21.6 kN vs 29.6/16 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RZ shares the 30×72×19 mm envelope but catalogue C/C0 differ (29.7/21.6 kN vs 29.6/16 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6306-C on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 32/16.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6306-C-2HRS on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 32/16.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6306-C-2Z on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 32/16.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6306DDU on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.3/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6306VV on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.3/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6306ZZ on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.3/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6306 on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.3/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6306 on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.5/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6306LLU on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.5/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6306LLB on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.5/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6306ZZ on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.5/15 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "306", "306" ], "locale_variants": {} }, { "sku": "306-ZZ", "brand": "SKF", "manufacturer_designation": "306-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.7, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.93, "reference_speed_rpm": 18000, "limiting_speed_rpm": 8800, "max_rpm": 8800, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "306-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 306 carries code 06 = 30 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 30×72×19 mm envelope its C 29.7 kN and C0 21.6 kN ratings (Pu 0.93 kN). SKF spells the double shield 306-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 8800 r/min, mass 370 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Limiting speed is just 8800 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 30×72 mm envelope, which is why 306-ZZ reaches C 29.7 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 306-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "306 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 306-2Z exactly when ordering replacements.", "The slots sit at one angular position: on 306-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Mount by heating the inner ring (max 120 °C) — driving 306-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 306-ZZ?", "a": "Filling-slot bearing 306-2Z measures 30×72×19 mm (1.181×2.835×0.748 in), about 370 g." }, { "q": "What does the designation 306 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 06 = 30 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 306-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 8800 r/min limiting speed are the typical failure modes." }, { "q": "Is 306-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 306-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (29.7/21.6 kN vs 22.9/15 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (29.7/21.6 kN vs 22.9/15 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (29.7/21.6 kN vs 22.9/15 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "full", "note": "Same 30×72×19 mm envelope and equivalent catalogue ratings; 306 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306 shares the 30×72×19 mm envelope but catalogue C/C0 differ (29.7/21.6 kN vs 29.6/16 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ (29.7/21.6 kN vs 29.6/16 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RSH shares the 30×72×19 mm envelope but catalogue C/C0 differ (29.7/21.6 kN vs 29.6/16 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6306-2RZ shares the 30×72×19 mm envelope but catalogue C/C0 differ (29.7/21.6 kN vs 29.6/16 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6306-C on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 32/16.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6306-C-2HRS on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 32/16.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6306-C-2Z on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 32/16.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6306DDU on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.3/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6306VV on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.3/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6306ZZ on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.3/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6306 on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.3/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6306 on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.5/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6306LLU on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.5/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6306LLB on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.5/15 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6306ZZ on the same 30×72×19 mm envelope, but catalogue C/C0 differ (29.7/21.6 kN vs 29.5/15 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "306-ZZ", "306-2Z" ], "locale_variants": {} }, { "sku": "207", "brand": "SKF", "manufacturer_designation": "207", "series": "200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 22, "fatigue_load_limit_kN": 0.93, "reference_speed_rpm": 17000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "207 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 207 carries code 07 = 35 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 35×72×17 mm envelope its C 27.5 kN and C0 22 kN ratings (Pu 0.93 kN). The open 207 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 10000 r/min, mass 310 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "207 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 207 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 27.5/22 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 207 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 10000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Shields on 207 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Do not preload 207 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 207?", "a": "Filling-slot bearing 207 measures 35×72×17 mm (1.378×2.835×0.669 in), about 310 g." }, { "q": "What does the designation 207 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 07 = 35 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 207 available sealed?", "a": "Shielded executions (-2Z, listed here as 207-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 27.5 kN for 207). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (27.5/22 kN vs 22.1/15.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (27.5/22 kN vs 22.1/15.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (27.5/22 kN vs 22.1/15.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×17 mm envelope and equivalent catalogue ratings; 207-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207 shares the 35×72×17 mm envelope but catalogue C/C0 differ (27.5/22 kN vs 27/15.3 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2Z shares the 35×72×17 mm envelope but catalogue C/C0 differ (27.5/22 kN vs 27/15.3 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2RSH shares the 35×72×17 mm envelope but catalogue C/C0 differ (27.5/22 kN vs 27/15.3 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6207-C on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28/15.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6207-C-2HRS on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28/15.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6207-C-2Z on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28/15.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6207DDU on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.2/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6207VV on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.2/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6207ZZ on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.2/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6207 on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.2/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6207 on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.4/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6207LLU on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.4/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6207LLB on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.4/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6207ZZ on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.4/15.3 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "207", "207" ], "locale_variants": {} }, { "sku": "207-ZZ", "brand": "SKF", "manufacturer_designation": "207-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 22, "fatigue_load_limit_kN": 0.93, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "207-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 207 carries code 07 = 35 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 35×72×17 mm envelope its C 27.5 kN and C0 22 kN ratings (Pu 0.93 kN). SKF spells the double shield 207-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 8000 r/min, mass 310 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Limiting speed is just 8000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 35×72 mm envelope, which is why 207-ZZ reaches C 27.5 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 207-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "207 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 207-2Z exactly when ordering replacements.", "Limiting speed is just 8000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 207-ZZ?", "a": "Filling-slot bearing 207-2Z measures 35×72×17 mm (1.378×2.835×0.669 in), about 310 g." }, { "q": "What does the designation 207 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 07 = 35 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." }, { "q": "What fails on 207-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 8000 r/min limiting speed are the typical failure modes." } ], "cross_ref": [ { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (27.5/22 kN vs 22.1/15.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (27.5/22 kN vs 22.1/15.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×17 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (27.5/22 kN vs 22.1/15.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "full", "note": "Same 35×72×17 mm envelope and equivalent catalogue ratings; 207 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207 shares the 35×72×17 mm envelope but catalogue C/C0 differ (27.5/22 kN vs 27/15.3 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2Z shares the 35×72×17 mm envelope but catalogue C/C0 differ (27.5/22 kN vs 27/15.3 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6207-2RSH shares the 35×72×17 mm envelope but catalogue C/C0 differ (27.5/22 kN vs 27/15.3 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6207-C on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28/15.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6207-C-2HRS on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28/15.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6207-C-2Z on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28/15.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6207DDU on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.2/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6207VV on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.2/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6207ZZ on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.2/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6207 on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.2/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6207 on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.4/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6207LLU on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.4/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6207LLB on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.4/15.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6207ZZ on the same 35×72×17 mm envelope, but catalogue C/C0 differ (27.5/22 kN vs 28.4/15.3 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "207-ZZ", "207-2Z" ], "locale_variants": {} }, { "sku": "307", "brand": "SKF", "manufacturer_designation": "307", "series": "300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34.7, "static_load_kN": 26.5, "fatigue_load_limit_kN": 1.12, "reference_speed_rpm": 16000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "307 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 307 carries code 07 = 35 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 35×80×21 mm envelope its C 34.7 kN and C0 26.5 kN ratings (Pu 1.12 kN). The open 307 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 9500 r/min, mass 480 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slew drives", "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "The slots sit at one angular position: on 307, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "307 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 307 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 34.7/26.5 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 307 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 9500 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Assign interference to the rotating ring: on a conventional shaft-mounted 35 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of 307?", "a": "Filling-slot bearing 307 measures 35×80×21 mm (1.378×3.15×0.827 in), about 480 g." }, { "q": "What does the designation 307 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 07 = 35 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 307?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 9500 r/min limiting speed are the typical failure modes." }, { "q": "Is 307 available sealed?", "a": "Shielded executions (-2Z, listed here as 307-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "6307-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope as SKF 6307 M, but catalogue C/C0 differ (34.7/26.5 kN vs 35.1/19 kN) — envelope match only after a load check." }, { "equiv_sku": "W6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (34.7/26.5 kN vs 28.6/19 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "307-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 35×80×21 mm envelope and equivalent catalogue ratings; 307-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6307", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6307 shares the 35×80×21 mm envelope but catalogue C/C0 differ (34.7/26.5 kN vs 35.1/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6307-2Z shares the 35×80×21 mm envelope but catalogue C/C0 differ (34.7/26.5 kN vs 35.1/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6307-2RSH shares the 35×80×21 mm envelope but catalogue C/C0 differ (34.7/26.5 kN vs 35.1/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6307-C on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6307-C-2HRS on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6307-C-2Z on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6307DDU on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 36.5/19.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6307VV on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 36.5/19.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6307ZZ on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 36.5/19.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6307 on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 36.5/19.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6307 on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6307LLU on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6307LLB on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6307ZZ on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "307", "307" ], "locale_variants": {} }, { "sku": "307-ZZ", "brand": "SKF", "manufacturer_designation": "307-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34.7, "static_load_kN": 26.5, "fatigue_load_limit_kN": 1.12, "reference_speed_rpm": 16000, "limiting_speed_rpm": 7600, "max_rpm": 7600, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "307-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 307 carries code 07 = 35 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 35×80×21 mm envelope its C 34.7 kN and C0 26.5 kN ratings (Pu 1.12 kN). SKF spells the double shield 307-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 7600 r/min, mass 480 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "307 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 307-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 34.7/26.5 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 307-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 7600 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "307 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 307-2Z exactly when ordering replacements.", "Do not preload 307-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 307-ZZ?", "a": "Filling-slot bearing 307-2Z measures 35×80×21 mm (1.378×3.15×0.827 in), about 480 g." }, { "q": "What does the designation 307 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 07 = 35 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 307-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6307-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope as SKF 6307 M, but catalogue C/C0 differ (34.7/26.5 kN vs 35.1/19 kN) — envelope match only after a load check." }, { "equiv_sku": "W6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×21 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (34.7/26.5 kN vs 28.6/19 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "307", "equiv_brand": "SKF", "level": "full", "note": "Same 35×80×21 mm envelope and equivalent catalogue ratings; 307 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6307", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6307 shares the 35×80×21 mm envelope but catalogue C/C0 differ (34.7/26.5 kN vs 35.1/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6307-2Z shares the 35×80×21 mm envelope but catalogue C/C0 differ (34.7/26.5 kN vs 35.1/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6307-2RSH shares the 35×80×21 mm envelope but catalogue C/C0 differ (34.7/26.5 kN vs 35.1/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6307-C on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6307-C-2HRS on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6307-C-2Z on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6307DDU on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 36.5/19.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6307VV on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 36.5/19.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6307ZZ on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 36.5/19.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6307 on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 36.5/19.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6307 on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6307LLU on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6307LLB on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6307ZZ on the same 35×80×21 mm envelope, but catalogue C/C0 differ (34.7/26.5 kN vs 37/19.1 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "307-ZZ", "307-2Z" ], "locale_variants": {} }, { "sku": "208", "brand": "SKF", "manufacturer_designation": "208", "series": "200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.6, "static_load_kN": 27, "fatigue_load_limit_kN": 1.16, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "208 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 208 carries code 08 = 40 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 40×80×18 mm envelope its C 33.6 kN and C0 27 kN ratings (Pu 1.16 kN). The open 208 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 9500 r/min, mass 390 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives", "material-handling winches" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "The slots sit at one angular position: on 208, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "208 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 208 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 33.6/27 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 208 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "The slots sit at one angular position: on 208, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "The fatigue load limit is 1.16 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of 208?", "a": "Filling-slot bearing 208 measures 40×80×18 mm (1.575×3.15×0.709 in), about 390 g." }, { "q": "What does the designation 208 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 08 = 40 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 208 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (33.6/27 kN vs 25.1/17.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (33.6/27 kN vs 25.1/17.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (33.6/27 kN vs 25.1/17.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope and equivalent catalogue ratings; 208-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208 shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RSH shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RZ shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6208-C on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 31.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6208-C-2HRS on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 31.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6208-C-2Z on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 31.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6208DDU on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32/17.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6208VV on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32/17.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6208ZZ on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32/17.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6208 on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32/17.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6208 on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6208LLU on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6208LLB on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6208ZZ on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32.5/17.8 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "208", "208" ], "locale_variants": {} }, { "sku": "208-ZZ", "brand": "SKF", "manufacturer_designation": "208-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.6, "static_load_kN": 27, "fatigue_load_limit_kN": 1.16, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7600, "max_rpm": 7600, "weight_g": 390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "208-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 208 carries code 08 = 40 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 40×80×18 mm envelope its C 33.6 kN and C0 27 kN ratings (Pu 1.16 kN). SKF spells the double shield 208-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 7600 r/min, mass 390 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Shields on 208-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 7600 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 40×80 mm envelope, which is why 208-ZZ reaches C 33.6 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 208-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Shields on 208-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Catalogue ratings for 208-ZZ (C 33.6 kN, C0 27 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 208-ZZ?", "a": "Filling-slot bearing 208-2Z measures 40×80×18 mm (1.575×3.15×0.709 in), about 390 g." }, { "q": "What does the designation 208 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 08 = 40 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 208-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 7600 r/min limiting speed are the typical failure modes." }, { "q": "Is 208-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 208-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (33.6/27 kN vs 25.1/17.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (33.6/27 kN vs 25.1/17.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (33.6/27 kN vs 25.1/17.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "full", "note": "Same 40×80×18 mm envelope and equivalent catalogue ratings; 208 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208 shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RSH shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6208-2RZ shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6208-C on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 31.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6208-C-2HRS on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 31.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6208-C-2Z on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 31.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6208DDU on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32/17.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6208VV on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32/17.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6208ZZ on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32/17.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6208 on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32/17.9 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6208 on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6208LLU on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6208LLB on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32.5/17.8 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6208ZZ on the same 40×80×18 mm envelope, but catalogue C/C0 differ (33.6/27 kN vs 32.5/17.8 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "208-ZZ", "208-2Z" ], "locale_variants": {} }, { "sku": "308", "brand": "SKF", "manufacturer_designation": "308", "series": "300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.7, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 640, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "308 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 308 carries code 08 = 40 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 40×90×23 mm envelope its C 45.7 kN and C0 36 kN ratings (Pu 1.53 kN). The open 308 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 8500 r/min, mass 640 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Shields on 308 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 8500 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 40×90 mm envelope, which is why 308 reaches C 45.7 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 308, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Shields on 308 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Deep-groove geometry tolerates only minutes of misalignment; if the 90 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 308." ], "faq": [ { "q": "What are the dimensions of 308?", "a": "Filling-slot bearing 308 measures 40×90×23 mm (1.575×3.543×0.906 in), about 640 g." }, { "q": "What does the designation 308 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 08 = 40 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 308 available sealed?", "a": "Shielded executions (-2Z, listed here as 308-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 45.7 kN for 308). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 40×90×23 mm envelope and equivalent catalogue ratings; 308-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6308 shares the 40×90×23 mm envelope but catalogue C/C0 differ (45.7/36 kN vs 42.3/24 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ (45.7/36 kN vs 42.3/24 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6308-2RSH shares the 40×90×23 mm envelope but catalogue C/C0 differ (45.7/36 kN vs 42.3/24 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6308-2RZ shares the 40×90×23 mm envelope but catalogue C/C0 differ (45.7/36 kN vs 42.3/24 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6308-C on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 47/25 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6308-C-2HRS on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 47/25 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6308-C-2Z on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 47/25 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6308DDU on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6308VV on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6308ZZ on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6308 on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6308 on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6308LLU on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6308LLB on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6308ZZ on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "308", "308" ], "locale_variants": {} }, { "sku": "308-ZZ", "brand": "SKF", "manufacturer_designation": "308-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.7, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 14000, "limiting_speed_rpm": 6800, "max_rpm": 6800, "weight_g": 640, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "308-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 308 carries code 08 = 40 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 40×90×23 mm envelope its C 45.7 kN and C0 36 kN ratings (Pu 1.53 kN). SKF spells the double shield 308-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 6800 r/min, mass 640 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "The slots sit at one angular position: on 308-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "308 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 308-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 45.7/36 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 308-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "The slots sit at one angular position: on 308-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Clearance suffixes follow the seal code in the designation stack (e.g. 308-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 308-ZZ?", "a": "Filling-slot bearing 308-2Z measures 40×90×23 mm (1.575×3.543×0.906 in), about 640 g." }, { "q": "What does the designation 308 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 08 = 40 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." }, { "q": "What fails on 308-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 6800 r/min limiting speed are the typical failure modes." } ], "cross_ref": [ { "equiv_sku": "308", "equiv_brand": "SKF", "level": "full", "note": "Same 40×90×23 mm envelope and equivalent catalogue ratings; 308 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6308 shares the 40×90×23 mm envelope but catalogue C/C0 differ (45.7/36 kN vs 42.3/24 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ (45.7/36 kN vs 42.3/24 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6308-2RSH shares the 40×90×23 mm envelope but catalogue C/C0 differ (45.7/36 kN vs 42.3/24 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6308-2RZ shares the 40×90×23 mm envelope but catalogue C/C0 differ (45.7/36 kN vs 42.3/24 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6308-C on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 47/25 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6308-C-2HRS on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 47/25 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6308-C-2Z on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 47/25 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6308DDU on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6308VV on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6308ZZ on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6308 on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6308 on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6308LLU on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6308LLB on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6308ZZ on the same 40×90×23 mm envelope, but catalogue C/C0 differ (45.7/36 kN vs 45/24 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "308-ZZ", "308-2Z" ], "locale_variants": {} }, { "sku": "209", "brand": "SKF", "manufacturer_designation": "209", "series": "200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.2, "static_load_kN": 30, "fatigue_load_limit_kN": 1.27, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "209 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 209 carries code 09 = 45 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 45×85×19 mm envelope its C 35.2 kN and C0 30 kN ratings (Pu 1.27 kN). The open 209 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 8500 r/min, mass 440 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "209 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 209 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 35.2/30 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 209 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 8500 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 45×85 mm envelope, which is why 209 reaches C 35.2 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Mount by heating the inner ring (max 120 °C) — driving 209 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 209?", "a": "Filling-slot bearing 209 measures 45×85×19 mm (1.772×3.346×0.748 in), about 440 g." }, { "q": "What does the designation 209 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 09 = 45 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 35.2 kN for 209). The slots also make the rings separable." }, { "q": "Can 209 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (35.2/30 kN vs 28.1/20.4 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (35.2/30 kN vs 28.1/20.4 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 45×85×19 mm envelope and equivalent catalogue ratings; 209-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209 shares the 45×85×19 mm envelope but catalogue C/C0 differ (35.2/30 kN vs 35.1/21.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209-2Z shares the 45×85×19 mm envelope but catalogue C/C0 differ (35.2/30 kN vs 35.1/21.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209-2RSH shares the 45×85×19 mm envelope but catalogue C/C0 differ (35.2/30 kN vs 35.1/21.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6209DDU on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 34.5/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6209VV on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 34.5/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6209ZZ on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 34.5/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6209 on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 34.5/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6209 on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 36/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6209LLU on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 36/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6209LLB on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 36/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6209ZZ on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 36/20.4 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "209", "209" ], "locale_variants": {} }, { "sku": "209-ZZ", "brand": "SKF", "manufacturer_designation": "209-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.2, "static_load_kN": 30, "fatigue_load_limit_kN": 1.27, "reference_speed_rpm": 14000, "limiting_speed_rpm": 6800, "max_rpm": 6800, "weight_g": 440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "209-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 209 carries code 09 = 45 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 45×85×19 mm envelope its C 35.2 kN and C0 30 kN ratings (Pu 1.27 kN). SKF spells the double shield 209-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 6800 r/min, mass 440 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "The slots sit at one angular position: on 209-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "209 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 209-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 35.2/30 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 209-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 35.2/30 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Deep-groove geometry tolerates only minutes of misalignment; if the 85 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 209-ZZ." ], "faq": [ { "q": "What are the dimensions of 209-ZZ?", "a": "Filling-slot bearing 209-2Z measures 45×85×19 mm (1.772×3.346×0.748 in), about 440 g." }, { "q": "What does the designation 209 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 09 = 45 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 35.2 kN for 209-ZZ). The slots also make the rings separable." }, { "q": "Can 209-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (35.2/30 kN vs 28.1/20.4 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×19 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (35.2/30 kN vs 28.1/20.4 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "full", "note": "Same 45×85×19 mm envelope and equivalent catalogue ratings; 209 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209 shares the 45×85×19 mm envelope but catalogue C/C0 differ (35.2/30 kN vs 35.1/21.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209-2Z shares the 45×85×19 mm envelope but catalogue C/C0 differ (35.2/30 kN vs 35.1/21.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6209-2RSH shares the 45×85×19 mm envelope but catalogue C/C0 differ (35.2/30 kN vs 35.1/21.6 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6209DDU on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 34.5/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6209VV on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 34.5/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6209ZZ on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 34.5/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6209 on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 34.5/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6209 on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 36/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6209LLU on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 36/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6209LLB on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 36/20.4 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6209ZZ on the same 45×85×19 mm envelope, but catalogue C/C0 differ (35.2/30 kN vs 36/20.4 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "209-ZZ", "209-2Z" ], "locale_variants": {} }, { "sku": "309", "brand": "SKF", "manufacturer_designation": "309", "series": "300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 55, "static_load_kN": 44, "fatigue_load_limit_kN": 1.86, "reference_speed_rpm": 13000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 880, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "309 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 309 carries code 09 = 45 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 45×100×25 mm envelope its C 55 kN and C0 44 kN ratings (Pu 1.86 kN). The open 309 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 7500 r/min, mass 880 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives", "material-handling winches" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 55/44 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 309 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 7500 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 45×100 mm envelope, which is why 309 reaches C 55 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Limiting speed is just 7500 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Do not preload 309 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 309?", "a": "Filling-slot bearing 309 measures 45×100×25 mm (1.772×3.937×0.984 in), about 880 g." }, { "q": "What does the designation 309 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 09 = 45 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 55 kN for 309). The slots also make the rings separable." }, { "q": "Can 309 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope as SKF 6309 M, but catalogue C/C0 differ (55/44 kN vs 55.3/31.5 kN) — envelope match only after a load check." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 45×100×25 mm envelope and equivalent catalogue ratings; 309-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6309 shares the 45×100×25 mm envelope but catalogue C/C0 differ (55/44 kN vs 55.3/31.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6309-2Z shares the 45×100×25 mm envelope but catalogue C/C0 differ (55/44 kN vs 55.3/31.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6309-2RSH shares the 45×100×25 mm envelope but catalogue C/C0 differ (55/44 kN vs 55.3/31.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6309DDU on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6309VV on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6309ZZ on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6309 on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6309 on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6309LLU on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6309LLB on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6309ZZ on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "309", "309" ], "locale_variants": {} }, { "sku": "309-ZZ", "brand": "SKF", "manufacturer_designation": "309-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 55, "static_load_kN": 44, "fatigue_load_limit_kN": 1.86, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 880, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "309-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 309 carries code 09 = 45 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 45×100×25 mm envelope its C 55 kN and C0 44 kN ratings (Pu 1.86 kN). SKF spells the double shield 309-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 6000 r/min, mass 880 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Filling slots let more balls be packed into the 45×100 mm envelope, which is why 309-ZZ reaches C 55 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 309-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "309 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 309-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 55/44 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 309-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Mount by heating the inner ring (max 120 °C) — driving 309-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 309-ZZ?", "a": "Filling-slot bearing 309-2Z measures 45×100×25 mm (1.772×3.937×0.984 in), about 880 g." }, { "q": "What does the designation 309 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 09 = 45 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 55 kN for 309-ZZ). The slots also make the rings separable." }, { "q": "Can 309-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×25 mm envelope as SKF 6309 M, but catalogue C/C0 differ (55/44 kN vs 55.3/31.5 kN) — envelope match only after a load check." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "full", "note": "Same 45×100×25 mm envelope and equivalent catalogue ratings; 309 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6309 shares the 45×100×25 mm envelope but catalogue C/C0 differ (55/44 kN vs 55.3/31.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6309-2Z shares the 45×100×25 mm envelope but catalogue C/C0 differ (55/44 kN vs 55.3/31.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6309-2RSH shares the 45×100×25 mm envelope but catalogue C/C0 differ (55/44 kN vs 55.3/31.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6309DDU on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6309VV on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6309ZZ on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6309 on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6309 on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6309LLU on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6309LLB on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6309-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6309ZZ on the same 45×100×25 mm envelope, but catalogue C/C0 differ (55/44 kN vs 58.5/32 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "309-ZZ", "309-2Z" ], "locale_variants": {} }, { "sku": "210", "brand": "SKF", "manufacturer_designation": "210", "series": "200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39.1, "static_load_kN": 34.5, "fatigue_load_limit_kN": 1.46, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "210 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 210 carries code 10 = 50 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 50×90×20 mm envelope its C 39.1 kN and C0 34.5 kN ratings (Pu 1.46 kN). The open 210 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 8000 r/min, mass 500 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "legacy machinery repairs", "slew drives", "material-handling winches", "slow heavy gearboxes" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "210 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 210 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 39.1/34.5 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 210 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 8000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "210 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 210 exactly when ordering replacements.", "Mount by heating the inner ring (max 120 °C) — driving 210 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 210?", "a": "Filling-slot bearing 210 measures 50×90×20 mm (1.969×3.543×0.787 in), about 500 g." }, { "q": "What does the designation 210 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 10 = 50 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 39.1 kN for 210). The slots also make the rings separable." }, { "q": "Can 210 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope as SKF 6210 M, but catalogue C/C0 differ (39.1/34.5 kN vs 37.1/23.2 kN) — envelope match only after a load check." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (39.1/34.5 kN vs 30.2/23.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (39.1/34.5 kN vs 30.2/23.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope and equivalent catalogue ratings; 210-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210 shares the 50×90×20 mm envelope but catalogue C/C0 differ (39.1/34.5 kN vs 37.1/23.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210-2Z shares the 50×90×20 mm envelope but catalogue C/C0 differ (39.1/34.5 kN vs 37.1/23.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210-2RSH shares the 50×90×20 mm envelope but catalogue C/C0 differ (39.1/34.5 kN vs 37.1/23.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6210DDU on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 38.5/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6210VV on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 38.5/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6210ZZ on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 38.5/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6210 on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 38.5/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6210 on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 39/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6210LLU on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 39/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6210LLB on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 39/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6210ZZ on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 39/23.2 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "210", "210" ], "locale_variants": {} }, { "sku": "210-ZZ", "brand": "SKF", "manufacturer_designation": "210-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39.1, "static_load_kN": 34.5, "fatigue_load_limit_kN": 1.46, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "210-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 210 carries code 10 = 50 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 50×90×20 mm envelope its C 39.1 kN and C0 34.5 kN ratings (Pu 1.46 kN). SKF spells the double shield 210-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 6400 r/min, mass 500 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives", "material-handling winches" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 39.1/34.5 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 210-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 6400 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 50×90 mm envelope, which is why 210-ZZ reaches C 39.1 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Limiting speed is just 6400 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Fillet radii must clear the 210-ZZ chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 210-ZZ?", "a": "Filling-slot bearing 210-2Z measures 50×90×20 mm (1.969×3.543×0.787 in), about 500 g." }, { "q": "What does the designation 210 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 10 = 50 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 210-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 6400 r/min limiting speed are the typical failure modes." }, { "q": "Is 210-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 210-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope as SKF 6210 M, but catalogue C/C0 differ (39.1/34.5 kN vs 37.1/23.2 kN) — envelope match only after a load check." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (39.1/34.5 kN vs 30.2/23.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×20 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (39.1/34.5 kN vs 30.2/23.2 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "full", "note": "Same 50×90×20 mm envelope and equivalent catalogue ratings; 210 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210 shares the 50×90×20 mm envelope but catalogue C/C0 differ (39.1/34.5 kN vs 37.1/23.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210-2Z shares the 50×90×20 mm envelope but catalogue C/C0 differ (39.1/34.5 kN vs 37.1/23.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6210-2RSH shares the 50×90×20 mm envelope but catalogue C/C0 differ (39.1/34.5 kN vs 37.1/23.2 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6210DDU on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 38.5/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6210VV on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 38.5/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6210ZZ on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 38.5/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6210 on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 38.5/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6210 on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 39/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6210LLU on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 39/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6210LLB on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 39/23.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6210ZZ on the same 50×90×20 mm envelope, but catalogue C/C0 differ (39.1/34.5 kN vs 39/23.2 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "210-ZZ", "210-2Z" ], "locale_variants": {} }, { "sku": "310", "brand": "SKF", "manufacturer_designation": "310", "series": "300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 64.4, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "310 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 310 carries code 10 = 50 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 50×110×27 mm envelope its C 64.4 kN and C0 52 kN ratings (Pu 2.2 kN). The open 310 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 7000 r/min, mass 1150 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slew drives", "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Limiting speed is just 7000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 50×110 mm envelope, which is why 310 reaches C 64.4 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 310, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "310 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 310 exactly when ordering replacements.", "Limiting speed is just 7000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Assign interference to the rotating ring: on a conventional shaft-mounted 50 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of 310?", "a": "Filling-slot bearing 310 measures 50×110×27 mm (1.969×4.331×1.063 in), about 1150 g." }, { "q": "What does the designation 310 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 10 = 50 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." }, { "q": "What fails on 310?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 7000 r/min limiting speed are the typical failure modes." } ], "cross_ref": [ { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope as SKF 6310 M, but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match only after a load check." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 50×110×27 mm envelope and equivalent catalogue ratings; 310-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6310 shares the 50×110×27 mm envelope but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6310-2Z shares the 50×110×27 mm envelope but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6310-2RSH shares the 50×110×27 mm envelope but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6310DDU on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6310VV on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6310ZZ on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6310 on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6310 on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68.5/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6310LLU on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68.5/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6310LLB on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68.5/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6310ZZ on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68.5/38.5 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "310", "310" ], "locale_variants": {} }, { "sku": "310-ZZ", "brand": "SKF", "manufacturer_designation": "310-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 64.4, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "310-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 310 carries code 10 = 50 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 50×110×27 mm envelope its C 64.4 kN and C0 52 kN ratings (Pu 2.2 kN). SKF spells the double shield 310-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 5600 r/min, mass 1150 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "310 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 310-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 64.4/52 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 310-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 5600 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 50×110 mm envelope, which is why 310-ZZ reaches C 64.4 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 310-ZZ?", "a": "Filling-slot bearing 310-2Z measures 50×110×27 mm (1.969×4.331×1.063 in), about 1150 g." }, { "q": "What does the designation 310 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 10 = 50 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 310-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×27 mm envelope as SKF 6310 M, but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match only after a load check." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "full", "note": "Same 50×110×27 mm envelope and equivalent catalogue ratings; 310 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6310 shares the 50×110×27 mm envelope but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6310-2Z shares the 50×110×27 mm envelope but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6310-2RSH shares the 50×110×27 mm envelope but catalogue C/C0 differ (64.4/52 kN vs 65/38 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6310DDU on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6310VV on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6310ZZ on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6310 on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6310 on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68.5/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6310LLU on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68.5/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6310LLB on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68.5/38.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6310-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6310ZZ on the same 50×110×27 mm envelope, but catalogue C/C0 differ (64.4/52 kN vs 68.5/38.5 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "310-ZZ", "310-2Z" ], "locale_variants": {} }, { "sku": "211", "brand": "SKF", "manufacturer_designation": "211", "series": "200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.4, "static_load_kN": 44, "fatigue_load_limit_kN": 1.86, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 660, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "211 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 211 carries code 11 = 55 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 55×100×21 mm envelope its C 48.4 kN and C0 44 kN ratings (Pu 1.86 kN). The open 211 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 7000 r/min, mass 660 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "The slots sit at one angular position: on 211, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "211 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 211 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 48.4/44 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 211 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 48.4/44 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "The fatigue load limit is 1.86 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of 211?", "a": "Filling-slot bearing 211 measures 55×100×21 mm (2.165×3.937×0.827 in), about 660 g." }, { "q": "What does the designation 211 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 11 = 55 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 211 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope as SKF 6211 M, but catalogue C/C0 differ (48.4/44 kN vs 46.2/29 kN) — envelope match only after a load check." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×21 mm envelope and equivalent catalogue ratings; 211-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6211 shares the 55×100×21 mm envelope but catalogue C/C0 differ (48.4/44 kN vs 46.2/29 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6211-2Z shares the 55×100×21 mm envelope but catalogue C/C0 differ (48.4/44 kN vs 46.2/29 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6211-2RSH shares the 55×100×21 mm envelope but catalogue C/C0 differ (48.4/44 kN vs 46.2/29 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6211-C on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 46.5/29 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6211-C-2HRS on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 46.5/29 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6211-C-2Z on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 46.5/29 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6211DDU on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 47.5/29.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6211VV on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 47.5/29.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6211ZZ on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 47.5/29.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6211 on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 47.5/29.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6211 on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 48/29.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6211LLU on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 48/29.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6211LLB on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 48/29.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6211ZZ on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 48/29.2 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "211", "211" ], "locale_variants": {} }, { "sku": "211-ZZ", "brand": "SKF", "manufacturer_designation": "211-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.4, "static_load_kN": 44, "fatigue_load_limit_kN": 1.86, "reference_speed_rpm": 12000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 660, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "211-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 211 carries code 11 = 55 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 55×100×21 mm envelope its C 48.4 kN and C0 44 kN ratings (Pu 1.86 kN). SKF spells the double shield 211-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 5600 r/min, mass 660 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "legacy machinery repairs", "slew drives", "material-handling winches", "slow heavy gearboxes" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Filling slots let more balls be packed into the 55×100 mm envelope, which is why 211-ZZ reaches C 48.4 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 211-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "211 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 211-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 48.4/44 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "211 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 211-2Z exactly when ordering replacements.", "At 55 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 211-ZZ?", "a": "Filling-slot bearing 211-2Z measures 55×100×21 mm (2.165×3.937×0.827 in), about 660 g." }, { "q": "What does the designation 211 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 11 = 55 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 211-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×21 mm envelope as SKF 6211 M, but catalogue C/C0 differ (48.4/44 kN vs 46.2/29 kN) — envelope match only after a load check." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "full", "note": "Same 55×100×21 mm envelope and equivalent catalogue ratings; 211 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6211 shares the 55×100×21 mm envelope but catalogue C/C0 differ (48.4/44 kN vs 46.2/29 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6211-2Z shares the 55×100×21 mm envelope but catalogue C/C0 differ (48.4/44 kN vs 46.2/29 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6211-2RSH shares the 55×100×21 mm envelope but catalogue C/C0 differ (48.4/44 kN vs 46.2/29 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6211-C on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 46.5/29 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6211-C-2HRS on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 46.5/29 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6211-C-2Z on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 46.5/29 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6211DDU on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 47.5/29.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6211VV on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 47.5/29.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6211ZZ on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 47.5/29.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6211 on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 47.5/29.3 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6211 on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 48/29.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6211LLU on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 48/29.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6211LLB on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 48/29.2 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6211-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6211ZZ on the same 55×100×21 mm envelope, but catalogue C/C0 differ (48.4/44 kN vs 48/29.2 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "211-ZZ", "211-2Z" ], "locale_variants": {} }, { "sku": "311", "brand": "SKF", "manufacturer_designation": "311", "series": "300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 79.2, "static_load_kN": 67, "fatigue_load_limit_kN": 2.85, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "311 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 311 carries code 11 = 55 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 55×120×29 mm envelope its C 79.2 kN and C0 67 kN ratings (Pu 2.85 kN). The open 311 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 6300 r/min, mass 1500 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Filling slots let more balls be packed into the 55×120 mm envelope, which is why 311 reaches C 79.2 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 311, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "311 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 311 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 79.2/67 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 311 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Fillet radii must clear the 311 chamfer so the 29 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 311?", "a": "Filling-slot bearing 311 measures 55×120×29 mm (2.165×4.724×1.142 in), about 1500 g." }, { "q": "What does the designation 311 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 11 = 55 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 311 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope as SKF 6311 M, but catalogue C/C0 differ (79.2/67 kN vs 74.1/45 kN) — envelope match only after a load check." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 55×120×29 mm envelope and equivalent catalogue ratings; 311-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6311 shares the 55×120×29 mm envelope but catalogue C/C0 differ (79.2/67 kN vs 74.1/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6311-2Z shares the 55×120×29 mm envelope but catalogue C/C0 differ (79.2/67 kN vs 74.1/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6311-2RSH shares the 55×120×29 mm envelope but catalogue C/C0 differ (79.2/67 kN vs 74.1/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6311-C on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 83/47.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6311-C-2HRS on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 83/47.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6311-C-2Z on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 83/47.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6311DDU on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 78.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6311VV on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 78.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6311ZZ on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 78.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6311 on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 78.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6311 on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 79.5/45 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6311LLU on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 79.5/45 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6311LLB on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 79.5/45 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6311ZZ on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 79.5/45 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "311", "311" ], "locale_variants": {} }, { "sku": "311-ZZ", "brand": "SKF", "manufacturer_designation": "311-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 79.2, "static_load_kN": 67, "fatigue_load_limit_kN": 2.85, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "311-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 311 carries code 11 = 55 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 55×120×29 mm envelope its C 79.2 kN and C0 67 kN ratings (Pu 2.85 kN). SKF spells the double shield 311-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 5000 r/min, mass 1500 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Limiting speed is just 5000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 55×120 mm envelope, which is why 311-ZZ reaches C 79.2 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 311-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "311 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 311-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 79.2/67 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Mount by heating the inner ring (max 120 °C) — driving 311-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 311-ZZ?", "a": "Filling-slot bearing 311-2Z measures 55×120×29 mm (2.165×4.724×1.142 in), about 1500 g." }, { "q": "What does the designation 311 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 11 = 55 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 311-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×29 mm envelope as SKF 6311 M, but catalogue C/C0 differ (79.2/67 kN vs 74.1/45 kN) — envelope match only after a load check." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "full", "note": "Same 55×120×29 mm envelope and equivalent catalogue ratings; 311 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6311 shares the 55×120×29 mm envelope but catalogue C/C0 differ (79.2/67 kN vs 74.1/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6311-2Z shares the 55×120×29 mm envelope but catalogue C/C0 differ (79.2/67 kN vs 74.1/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6311-2RSH shares the 55×120×29 mm envelope but catalogue C/C0 differ (79.2/67 kN vs 74.1/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6311-C on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 83/47.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6311-C-2HRS on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 83/47.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6311-C-2Z on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 83/47.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6311DDU on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 78.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6311VV on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 78.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6311ZZ on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 78.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6311 on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 78.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6311 on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 79.5/45 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6311LLU on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 79.5/45 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6311LLB on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 79.5/45 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6311-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6311ZZ on the same 55×120×29 mm envelope, but catalogue C/C0 differ (79.2/67 kN vs 79.5/45 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "311-ZZ", "311-2Z" ], "locale_variants": {} }, { "sku": "212", "brand": "SKF", "manufacturer_designation": "212", "series": "200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 56.1, "static_load_kN": 50, "fatigue_load_limit_kN": 2.12, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "212 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 212 carries code 12 = 60 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 60×110×22 mm envelope its C 56.1 kN and C0 50 kN ratings (Pu 2.12 kN). The open 212 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 6700 r/min, mass 850 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Shields on 212 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 6700 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 60×110 mm envelope, which is why 212 reaches C 56.1 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 212, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Shields on 212 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "At 60 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 212?", "a": "Filling-slot bearing 212 measures 60×110×22 mm (2.362×4.331×0.866 in), about 850 g." }, { "q": "What does the designation 212 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 12 = 60 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 212?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 6700 r/min limiting speed are the typical failure modes." }, { "q": "Is 212 available sealed?", "a": "Shielded executions (-2Z, listed here as 212-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope as SKF 6212 M, but catalogue C/C0 differ (56.1/50 kN vs 55.3/36 kN) — envelope match only after a load check." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×22 mm envelope and equivalent catalogue ratings; 212-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6212 shares the 60×110×22 mm envelope but catalogue C/C0 differ (56.1/50 kN vs 55.3/36 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6212-2Z shares the 60×110×22 mm envelope but catalogue C/C0 differ (56.1/50 kN vs 55.3/36 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6212-2RSH shares the 60×110×22 mm envelope but catalogue C/C0 differ (56.1/50 kN vs 55.3/36 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6212DDU on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 57.5/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6212VV on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 57.5/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6212ZZ on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 57.5/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6212 on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 57.5/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6212 on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 58/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6212LLU on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 58/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6212LLB on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 58/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6212ZZ on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 58/36 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "212", "212" ], "locale_variants": {} }, { "sku": "212-ZZ", "brand": "SKF", "manufacturer_designation": "212-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 56.1, "static_load_kN": 50, "fatigue_load_limit_kN": 2.12, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "212-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 212 carries code 12 = 60 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 60×110×22 mm envelope its C 56.1 kN and C0 50 kN ratings (Pu 2.12 kN). SKF spells the double shield 212-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 5400 r/min, mass 850 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 56.1/50 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 212-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 5400 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 60×110 mm envelope, which is why 212-ZZ reaches C 56.1 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 212-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Assign interference to the rotating ring: on a conventional shaft-mounted 60 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of 212-ZZ?", "a": "Filling-slot bearing 212-2Z measures 60×110×22 mm (2.362×4.331×0.866 in), about 850 g." }, { "q": "What does the designation 212 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 12 = 60 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 212-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×22 mm envelope as SKF 6212 M, but catalogue C/C0 differ (56.1/50 kN vs 55.3/36 kN) — envelope match only after a load check." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "full", "note": "Same 60×110×22 mm envelope and equivalent catalogue ratings; 212 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6212 shares the 60×110×22 mm envelope but catalogue C/C0 differ (56.1/50 kN vs 55.3/36 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6212-2Z shares the 60×110×22 mm envelope but catalogue C/C0 differ (56.1/50 kN vs 55.3/36 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6212-2RSH shares the 60×110×22 mm envelope but catalogue C/C0 differ (56.1/50 kN vs 55.3/36 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6212DDU on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 57.5/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6212VV on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 57.5/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6212ZZ on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 57.5/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6212 on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 57.5/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6212 on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 58/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6212LLU on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 58/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6212LLB on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 58/36 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6212-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6212ZZ on the same 60×110×22 mm envelope, but catalogue C/C0 differ (56.1/50 kN vs 58/36 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "212-ZZ", "212-2Z" ], "locale_variants": {} }, { "sku": "312", "brand": "SKF", "manufacturer_designation": "312", "series": "300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 91.3, "static_load_kN": 78, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 1850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "312 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 312 carries code 12 = 60 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 60×130×31 mm envelope its C 91.3 kN and C0 78 kN ratings (Pu 3.35 kN). The open 312 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 6000 r/min, mass 1850 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "The slots sit at one angular position: on 312, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "312 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 312 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 91.3/78 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 312 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "The slots sit at one angular position: on 312, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "The fatigue load limit is 3.35 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of 312?", "a": "Filling-slot bearing 312 measures 60×130×31 mm (2.362×5.118×1.22 in), about 1850 g." }, { "q": "What does the designation 312 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 12 = 60 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 91.3 kN for 312). The slots also make the rings separable." }, { "q": "Can 312 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope as SKF 6312 M, but catalogue C/C0 differ (91.3/78 kN vs 85.2/52 kN) — envelope match only after a load check." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 60×130×31 mm envelope and equivalent catalogue ratings; 312-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6312 shares the 60×130×31 mm envelope but catalogue C/C0 differ (91.3/78 kN vs 85.2/52 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6312-2Z shares the 60×130×31 mm envelope but catalogue C/C0 differ (91.3/78 kN vs 85.2/52 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6312-2RSH shares the 60×130×31 mm envelope but catalogue C/C0 differ (91.3/78 kN vs 85.2/52 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6312DDU on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6312VV on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6312ZZ on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6312 on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6312 on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90.5/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6312LLU on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90.5/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6312LLB on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90.5/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6312ZZ on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90.5/52 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "312", "312" ], "locale_variants": {} }, { "sku": "312-ZZ", "brand": "SKF", "manufacturer_designation": "312-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 91.3, "static_load_kN": 78, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "312-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 312 carries code 12 = 60 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 60×130×31 mm envelope its C 91.3 kN and C0 78 kN ratings (Pu 3.35 kN). SKF spells the double shield 312-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4800 r/min, mass 1850 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Shields on 312-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4800 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 60×130 mm envelope, which is why 312-ZZ reaches C 91.3 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 312-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Filling slots let more balls be packed into the 60×130 mm envelope, which is why 312-ZZ reaches C 91.3 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Clearance suffixes follow the seal code in the designation stack (e.g. 312-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 312-ZZ?", "a": "Filling-slot bearing 312-2Z measures 60×130×31 mm (2.362×5.118×1.22 in), about 1850 g." }, { "q": "What does the designation 312 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 12 = 60 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 312-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 4800 r/min limiting speed are the typical failure modes." }, { "q": "Is 312-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 312-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×31 mm envelope as SKF 6312 M, but catalogue C/C0 differ (91.3/78 kN vs 85.2/52 kN) — envelope match only after a load check." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "full", "note": "Same 60×130×31 mm envelope and equivalent catalogue ratings; 312 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6312 shares the 60×130×31 mm envelope but catalogue C/C0 differ (91.3/78 kN vs 85.2/52 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6312-2Z shares the 60×130×31 mm envelope but catalogue C/C0 differ (91.3/78 kN vs 85.2/52 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6312-2RSH shares the 60×130×31 mm envelope but catalogue C/C0 differ (91.3/78 kN vs 85.2/52 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6312DDU on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6312VV on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6312ZZ on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6312 on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6312 on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90.5/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6312LLU on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90.5/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6312LLB on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90.5/52 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6312-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6312ZZ on the same 60×130×31 mm envelope, but catalogue C/C0 differ (91.3/78 kN vs 90.5/52 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "312-ZZ", "312-2Z" ], "locale_variants": {} }, { "sku": "213", "brand": "SKF", "manufacturer_designation": "213", "series": "200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 60.5, "static_load_kN": 58.5, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "213 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 213 carries code 13 = 65 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 65×120×23 mm envelope its C 60.5 kN and C0 58.5 kN ratings (Pu 2.5 kN). The open 213 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 6000 r/min, mass 1050 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives", "material-handling winches" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 60.5/58.5 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 213 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 6000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 65×120 mm envelope, which is why 213 reaches C 60.5 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Limiting speed is just 6000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Catalogue ratings for 213 (C 60.5 kN, C0 58.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 213?", "a": "Filling-slot bearing 213 measures 65×120×23 mm (2.559×4.724×0.906 in), about 1050 g." }, { "q": "What does the designation 213 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 13 = 65 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 213 available sealed?", "a": "Shielded executions (-2Z, listed here as 213-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 60.5 kN for 213). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope as SKF 6213 M, but catalogue C/C0 differ (60.5/58.5 kN vs 58.5/40.5 kN) — envelope match only after a load check." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×23 mm envelope and equivalent catalogue ratings; 213-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6213 shares the 65×120×23 mm envelope but catalogue C/C0 differ (60.5/58.5 kN vs 58.5/40.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6213-2Z shares the 65×120×23 mm envelope but catalogue C/C0 differ (60.5/58.5 kN vs 58.5/40.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6213DDU on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6213VV on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6213ZZ on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6213 on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6213 on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63.5/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6213LLU on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63.5/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6213LLB on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63.5/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6213ZZ on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63.5/40 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "213", "213" ], "locale_variants": {} }, { "sku": "213-ZZ", "brand": "SKF", "manufacturer_designation": "213-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 60.5, "static_load_kN": 58.5, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "213-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 213 carries code 13 = 65 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 65×120×23 mm envelope its C 60.5 kN and C0 58.5 kN ratings (Pu 2.5 kN). SKF spells the double shield 213-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4800 r/min, mass 1050 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Shields on 213-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4800 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 65×120 mm envelope, which is why 213-ZZ reaches C 60.5 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 213-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Shields on 213-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Mount by heating the inner ring (max 120 °C) — driving 213-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 213-ZZ?", "a": "Filling-slot bearing 213-2Z measures 65×120×23 mm (2.559×4.724×0.906 in), about 1050 g." }, { "q": "What does the designation 213 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 13 = 65 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 60.5 kN for 213-ZZ). The slots also make the rings separable." }, { "q": "Can 213-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope as SKF 6213 M, but catalogue C/C0 differ (60.5/58.5 kN vs 58.5/40.5 kN) — envelope match only after a load check." }, { "equiv_sku": "213", "equiv_brand": "SKF", "level": "full", "note": "Same 65×120×23 mm envelope and equivalent catalogue ratings; 213 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6213 shares the 65×120×23 mm envelope but catalogue C/C0 differ (60.5/58.5 kN vs 58.5/40.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6213-2Z shares the 65×120×23 mm envelope but catalogue C/C0 differ (60.5/58.5 kN vs 58.5/40.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6213DDU on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6213VV on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6213ZZ on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6213 on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6213 on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63.5/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6213LLU on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63.5/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6213LLB on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63.5/40 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6213-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6213ZZ on the same 65×120×23 mm envelope, but catalogue C/C0 differ (60.5/58.5 kN vs 63.5/40 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "213-ZZ", "213-2Z" ], "locale_variants": {} }, { "sku": "313", "brand": "SKF", "manufacturer_designation": "313", "series": "300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 102, "static_load_kN": 90, "fatigue_load_limit_kN": 3.75, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "313 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 313 carries code 13 = 65 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 65×140×33 mm envelope its C 102 kN and C0 90 kN ratings (Pu 3.75 kN). The open 313 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 5300 r/min, mass 2300 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "313 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 313 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 102/90 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 313 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 5300 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 65×140 mm envelope, which is why 313 reaches C 102 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Mount by heating the inner ring (max 120 °C) — driving 313 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 313?", "a": "Filling-slot bearing 313 measures 65×140×33 mm (2.559×5.512×1.299 in), about 2300 g." }, { "q": "What does the designation 313 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 13 = 65 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 313 available sealed?", "a": "Shielded executions (-2Z, listed here as 313-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 102 kN for 313). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope as SKF 6313 M, but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match only after a load check." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 65×140×33 mm envelope and equivalent catalogue ratings; 313-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6313 shares the 65×140×33 mm envelope but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6313-2Z shares the 65×140×33 mm envelope but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6313-2RS1 shares the 65×140×33 mm envelope but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6313DDU on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 102/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6313VV on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 102/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6313ZZ on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 102/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6313 on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 102/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6313 on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 103/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6313LLU on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 103/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6313LLB on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 103/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6313ZZ on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 103/60 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "313", "313" ], "locale_variants": {} }, { "sku": "313-ZZ", "brand": "SKF", "manufacturer_designation": "313-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 102, "static_load_kN": 90, "fatigue_load_limit_kN": 3.75, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "313-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 313 carries code 13 = 65 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 65×140×33 mm envelope its C 102 kN and C0 90 kN ratings (Pu 3.75 kN). SKF spells the double shield 313-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4300 r/min, mass 2300 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slew drives", "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "The slots sit at one angular position: on 313-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "313 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 313-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 102/90 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 313-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "The slots sit at one angular position: on 313-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Catalogue ratings for 313-ZZ (C 102 kN, C0 90 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 313-ZZ?", "a": "Filling-slot bearing 313-2Z measures 65×140×33 mm (2.559×5.512×1.299 in), about 2300 g." }, { "q": "What does the designation 313 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 13 = 65 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 313-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 313-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 102 kN for 313-ZZ). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×33 mm envelope as SKF 6313 M, but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match only after a load check." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "full", "note": "Same 65×140×33 mm envelope and equivalent catalogue ratings; 313 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6313 shares the 65×140×33 mm envelope but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6313-2Z shares the 65×140×33 mm envelope but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6313-2RS1 shares the 65×140×33 mm envelope but catalogue C/C0 differ (102/90 kN vs 97.5/60 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6313DDU on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 102/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6313VV on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 102/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6313ZZ on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 102/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6313 on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 102/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6313 on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 103/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6313LLU on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 103/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6313LLB on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 103/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6313-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6313ZZ on the same 65×140×33 mm envelope, but catalogue C/C0 differ (102/90 kN vs 103/60 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "313-ZZ", "313-2Z" ], "locale_variants": {} }, { "sku": "214", "brand": "SKF", "manufacturer_designation": "214", "series": "200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "214 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 214 carries code 14 = 70 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 70×125×24 mm envelope its C 66 kN and C0 65.5 kN ratings (Pu 2.75 kN). The open 214 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 5600 r/min, mass 1150 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Shields on 214 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 5600 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 70×125 mm envelope, which is why 214 reaches C 66 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 214, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Filling slots let more balls be packed into the 70×125 mm envelope, which is why 214 reaches C 66 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Do not preload 214 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 214?", "a": "Filling-slot bearing 214 measures 70×125×24 mm (2.756×4.921×0.945 in), about 1150 g." }, { "q": "What does the designation 214 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 14 = 70 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 214 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope as SKF 6214 M, but catalogue C/C0 differ (66/65.5 kN vs 60.5/45 kN) — envelope match only after a load check." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×24 mm envelope and equivalent catalogue ratings; 214-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6214 shares the 70×125×24 mm envelope but catalogue C/C0 differ (66/65.5 kN vs 63.7/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6214-2Z shares the 70×125×24 mm envelope but catalogue C/C0 differ (66/65.5 kN vs 63.7/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6214-2RS1 shares the 70×125×24 mm envelope but catalogue C/C0 differ (66/65.5 kN vs 63.7/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214DDU on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214VV on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214ZZ on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214 on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214 on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 69/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214LLU on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 69/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214LLB on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 69/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214ZZ on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 69/44 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "214", "214" ], "locale_variants": {} }, { "sku": "214-ZZ", "brand": "SKF", "manufacturer_designation": "214-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "214-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 214 carries code 14 = 70 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 70×125×24 mm envelope its C 66 kN and C0 65.5 kN ratings (Pu 2.75 kN). SKF spells the double shield 214-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4500 r/min, mass 1150 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 66/65.5 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 214-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4500 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 70×125 mm envelope, which is why 214-ZZ reaches C 66 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 214-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Fillet radii must clear the 214-ZZ chamfer so the 24 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 214-ZZ?", "a": "Filling-slot bearing 214-2Z measures 70×125×24 mm (2.756×4.921×0.945 in), about 1150 g." }, { "q": "What does the designation 214 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 14 = 70 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 214-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 214-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 66 kN for 214-ZZ). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope as SKF 6214 M, but catalogue C/C0 differ (66/65.5 kN vs 60.5/45 kN) — envelope match only after a load check." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×24 mm envelope and equivalent catalogue ratings; 214 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6214 shares the 70×125×24 mm envelope but catalogue C/C0 differ (66/65.5 kN vs 63.7/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6214-2Z shares the 70×125×24 mm envelope but catalogue C/C0 differ (66/65.5 kN vs 63.7/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6214-2RS1 shares the 70×125×24 mm envelope but catalogue C/C0 differ (66/65.5 kN vs 63.7/45 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214DDU on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214VV on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214ZZ on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6214 on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 68.5/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214 on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 69/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214LLU on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 69/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214LLB on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 69/44 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6214-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6214ZZ on the same 70×125×24 mm envelope, but catalogue C/C0 differ (66/65.5 kN vs 69/44 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "214-ZZ", "214-2Z" ], "locale_variants": {} }, { "sku": "314", "brand": "SKF", "manufacturer_designation": "314", "series": "300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 114, "static_load_kN": 102, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 2750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "314 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 314 carries code 14 = 70 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 70×150×35 mm envelope its C 114 kN and C0 102 kN ratings (Pu 4.15 kN). The open 314 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 5000 r/min, mass 2750 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 114/102 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 314 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 5000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 70×150 mm envelope, which is why 314 reaches C 114 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 314, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "At 70 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 314?", "a": "Filling-slot bearing 314 measures 70×150×35 mm (2.756×5.906×1.378 in), about 2750 g." }, { "q": "What does the designation 314 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 14 = 70 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 314 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope as SKF 6314 M, but catalogue C/C0 differ (114/102 kN vs 111/68 kN) — envelope match only after a load check." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope and equivalent catalogue ratings; 314-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6314 shares the 70×150×35 mm envelope but catalogue C/C0 differ (114/102 kN vs 111/68 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6314-2Z shares the 70×150×35 mm envelope but catalogue C/C0 differ (114/102 kN vs 111/68 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6314-2RS1 shares the 70×150×35 mm envelope but catalogue C/C0 differ (114/102 kN vs 111/68 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6314DDU on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6314VV on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6314ZZ on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6314 on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6314 on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6314LLU on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6314LLB on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6314ZZ on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "314", "314" ], "locale_variants": {} }, { "sku": "314-ZZ", "brand": "SKF", "manufacturer_designation": "314-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 114, "static_load_kN": 102, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "314-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 314 carries code 14 = 70 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 70×150×35 mm envelope its C 114 kN and C0 102 kN ratings (Pu 4.15 kN). SKF spells the double shield 314-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4000 r/min, mass 2750 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "legacy machinery repairs", "slew drives", "material-handling winches", "slow heavy gearboxes" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Shields on 314-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 70×150 mm envelope, which is why 314-ZZ reaches C 114 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 314-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Filling slots let more balls be packed into the 70×150 mm envelope, which is why 314-ZZ reaches C 114 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Deep-groove geometry tolerates only minutes of misalignment; if the 150 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 314-ZZ." ], "faq": [ { "q": "What are the dimensions of 314-ZZ?", "a": "Filling-slot bearing 314-2Z measures 70×150×35 mm (2.756×5.906×1.378 in), about 2750 g." }, { "q": "What does the designation 314 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 14 = 70 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 314-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 4000 r/min limiting speed are the typical failure modes." }, { "q": "Is 314-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 314-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope as SKF 6314 M, but catalogue C/C0 differ (114/102 kN vs 111/68 kN) — envelope match only after a load check." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope and equivalent catalogue ratings; 314 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6314 shares the 70×150×35 mm envelope but catalogue C/C0 differ (114/102 kN vs 111/68 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6314-2Z shares the 70×150×35 mm envelope but catalogue C/C0 differ (114/102 kN vs 111/68 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6314-2RS1 shares the 70×150×35 mm envelope but catalogue C/C0 differ (114/102 kN vs 111/68 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6314DDU on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6314VV on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6314ZZ on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6314 on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6314 on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6314LLU on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6314LLB on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6314-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6314ZZ on the same 70×150×35 mm envelope, but catalogue C/C0 differ (114/102 kN vs 115/68 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "314-ZZ", "314-2Z" ], "locale_variants": {} }, { "sku": "215", "brand": "SKF", "manufacturer_designation": "215", "series": "200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 72.1, "static_load_kN": 72, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 1250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "215 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 215 carries code 15 = 75 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 75×130×25 mm envelope its C 72.1 kN and C0 72 kN ratings (Pu 3 kN). The open 215 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 5300 r/min, mass 1250 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slew drives", "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 72.1/72 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 215 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 5300 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 75×130 mm envelope, which is why 215 reaches C 72.1 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 215, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Clearance suffixes follow the seal code in the designation stack (e.g. 215-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 215?", "a": "Filling-slot bearing 215 measures 75×130×25 mm (2.953×5.118×0.984 in), about 1250 g." }, { "q": "What does the designation 215 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 15 = 75 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." }, { "q": "What fails on 215?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 5300 r/min limiting speed are the typical failure modes." } ], "cross_ref": [ { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope as SKF 6215 M, but catalogue C/C0 differ (72.1/72 kN vs 68.9/49 kN) — envelope match only after a load check." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope and equivalent catalogue ratings; 215-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6215 shares the 75×130×25 mm envelope but catalogue C/C0 differ (72.1/72 kN vs 68.9/49 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6215-2Z shares the 75×130×25 mm envelope but catalogue C/C0 differ (72.1/72 kN vs 68.9/49 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6215-2RS1 shares the 75×130×25 mm envelope but catalogue C/C0 differ (72.1/72 kN vs 68.9/49 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6215DDU on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6215VV on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6215ZZ on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6215 on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6215 on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73.5/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6215LLU on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73.5/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6215LLB on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73.5/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6215ZZ on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73.5/49.5 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "215", "215" ], "locale_variants": {} }, { "sku": "215-ZZ", "brand": "SKF", "manufacturer_designation": "215-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 72.1, "static_load_kN": 72, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "215-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 215 carries code 15 = 75 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 75×130×25 mm envelope its C 72.1 kN and C0 72 kN ratings (Pu 3 kN). SKF spells the double shield 215-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4300 r/min, mass 1250 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Filling slots let more balls be packed into the 75×130 mm envelope, which is why 215-ZZ reaches C 72.1 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 215-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "215 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 215-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 72.1/72 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Filling slots let more balls be packed into the 75×130 mm envelope, which is why 215-ZZ reaches C 72.1 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Deep-groove geometry tolerates only minutes of misalignment; if the 130 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 215-ZZ." ], "faq": [ { "q": "What are the dimensions of 215-ZZ?", "a": "Filling-slot bearing 215-2Z measures 75×130×25 mm (2.953×5.118×0.984 in), about 1250 g." }, { "q": "What does the designation 215 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 15 = 75 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." }, { "q": "What fails on 215-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 4300 r/min limiting speed are the typical failure modes." } ], "cross_ref": [ { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope as SKF 6215 M, but catalogue C/C0 differ (72.1/72 kN vs 68.9/49 kN) — envelope match only after a load check." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope and equivalent catalogue ratings; 215 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6215 shares the 75×130×25 mm envelope but catalogue C/C0 differ (72.1/72 kN vs 68.9/49 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6215-2Z shares the 75×130×25 mm envelope but catalogue C/C0 differ (72.1/72 kN vs 68.9/49 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6215-2RS1 shares the 75×130×25 mm envelope but catalogue C/C0 differ (72.1/72 kN vs 68.9/49 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6215DDU on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6215VV on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6215ZZ on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6215 on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6215 on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73.5/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6215LLU on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73.5/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6215LLB on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73.5/49.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6215-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6215ZZ on the same 75×130×25 mm envelope, but catalogue C/C0 differ (72.1/72 kN vs 73.5/49.5 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "215-ZZ", "215-2Z" ], "locale_variants": {} }, { "sku": "315", "brand": "SKF", "manufacturer_designation": "315", "series": "300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 116, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 3250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "315 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 315 carries code 15 = 75 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 75×160×37 mm envelope its C 125 kN and C0 116 kN ratings (Pu 4.55 kN). The open 315 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 4800 r/min, mass 3250 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "legacy machinery repairs", "slew drives", "material-handling winches", "slow heavy gearboxes" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Shields on 315 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4800 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 75×160 mm envelope, which is why 315 reaches C 125 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 315, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Filling slots let more balls be packed into the 75×160 mm envelope, which is why 315 reaches C 125 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Clearance suffixes follow the seal code in the designation stack (e.g. 315-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 315?", "a": "Filling-slot bearing 315 measures 75×160×37 mm (2.953×6.299×1.457 in), about 3250 g." }, { "q": "What does the designation 315 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 15 = 75 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 125 kN for 315). The slots also make the rings separable." }, { "q": "Can 315 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope as SKF 6315 M, but catalogue C/C0 differ (125/116 kN vs 119/76.5 kN) — envelope match only after a load check." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope and equivalent catalogue ratings; 315-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6315 shares the 75×160×37 mm envelope but catalogue C/C0 differ (125/116 kN vs 119/76.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6315-2Z shares the 75×160×37 mm envelope but catalogue C/C0 differ (125/116 kN vs 119/76.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6315-2RS1 shares the 75×160×37 mm envelope but catalogue C/C0 differ (125/116 kN vs 119/76.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6315DDU on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 125/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6315VV on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 125/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6315ZZ on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 125/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6315 on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 125/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6315 on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 126/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6315LLU on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 126/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6315LLB on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 126/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6315ZZ on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 126/77 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "315", "315" ], "locale_variants": {} }, { "sku": "315-ZZ", "brand": "SKF", "manufacturer_designation": "315-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 116, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3840, "max_rpm": 3840, "weight_g": 3250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "315-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 315 carries code 15 = 75 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 75×160×37 mm envelope its C 125 kN and C0 116 kN ratings (Pu 4.55 kN). SKF spells the double shield 315-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 3840 r/min, mass 3250 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives", "material-handling winches" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 125/116 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 315-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 3840 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 75×160 mm envelope, which is why 315-ZZ reaches C 125 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 125/116 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "At 75 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 315-ZZ?", "a": "Filling-slot bearing 315-2Z measures 75×160×37 mm (2.953×6.299×1.457 in), about 3250 g." }, { "q": "What does the designation 315 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 15 = 75 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 125 kN for 315-ZZ). The slots also make the rings separable." }, { "q": "Can 315-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope as SKF 6315 M, but catalogue C/C0 differ (125/116 kN vs 119/76.5 kN) — envelope match only after a load check." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope and equivalent catalogue ratings; 315 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6315 shares the 75×160×37 mm envelope but catalogue C/C0 differ (125/116 kN vs 119/76.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6315-2Z shares the 75×160×37 mm envelope but catalogue C/C0 differ (125/116 kN vs 119/76.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6315-2RS1 shares the 75×160×37 mm envelope but catalogue C/C0 differ (125/116 kN vs 119/76.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6315DDU on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 125/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6315VV on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 125/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6315ZZ on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 125/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6315 on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 125/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6315 on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 126/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6315LLU on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 126/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6315LLB on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 126/77 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6315-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6315ZZ on the same 75×160×37 mm envelope, but catalogue C/C0 differ (125/116 kN vs 126/77 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "315-ZZ", "315-2Z" ], "locale_variants": {} }, { "sku": "216", "brand": "SKF", "manufacturer_designation": "216", "series": "200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88, "static_load_kN": 85, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "216 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 216 carries code 16 = 80 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 80×140×26 mm envelope its C 88 kN and C0 85 kN ratings (Pu 3.45 kN). The open 216 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 5000 r/min, mass 1550 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Filling slots let more balls be packed into the 80×140 mm envelope, which is why 216 reaches C 88 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 216, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "216 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 216 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 88/85 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "216 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 216 exactly when ordering replacements.", "Assign interference to the rotating ring: on a conventional shaft-mounted 80 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of 216?", "a": "Filling-slot bearing 216 measures 80×140×26 mm (3.15×5.512×1.024 in), about 1550 g." }, { "q": "What does the designation 216 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 16 = 80 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 216 available sealed?", "a": "Shielded executions (-2Z, listed here as 216-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 88 kN for 216). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope as SKF 6216 M, but catalogue C/C0 differ (88/85 kN vs 72.8/55 kN) — envelope match only after a load check." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×26 mm envelope and equivalent catalogue ratings; 216-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6216 shares the 80×140×26 mm envelope but catalogue C/C0 differ (88/85 kN vs 72.8/55 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6216-2Z shares the 80×140×26 mm envelope but catalogue C/C0 differ (88/85 kN vs 72.8/55 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6216-2RS1 shares the 80×140×26 mm envelope but catalogue C/C0 differ (88/85 kN vs 72.8/55 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6216DDU on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6216VV on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6216ZZ on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6216 on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216 on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80.5/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216LLU on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80.5/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216LLB on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80.5/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216ZZ on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80.5/53 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "216", "216" ], "locale_variants": {} }, { "sku": "216-ZZ", "brand": "SKF", "manufacturer_designation": "216-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88, "static_load_kN": 85, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "216-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 216 carries code 16 = 80 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 80×140×26 mm envelope its C 88 kN and C0 85 kN ratings (Pu 3.45 kN). SKF spells the double shield 216-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4000 r/min, mass 1550 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slew drives", "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 88/85 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 216-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 80×140 mm envelope, which is why 216-ZZ reaches C 88 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Limiting speed is just 4000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Assign interference to the rotating ring: on a conventional shaft-mounted 80 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of 216-ZZ?", "a": "Filling-slot bearing 216-2Z measures 80×140×26 mm (3.15×5.512×1.024 in), about 1550 g." }, { "q": "What does the designation 216 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 16 = 80 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." }, { "q": "What fails on 216-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 4000 r/min limiting speed are the typical failure modes." } ], "cross_ref": [ { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope as SKF 6216 M, but catalogue C/C0 differ (88/85 kN vs 72.8/55 kN) — envelope match only after a load check." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×26 mm envelope and equivalent catalogue ratings; 216 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6216 shares the 80×140×26 mm envelope but catalogue C/C0 differ (88/85 kN vs 72.8/55 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6216-2Z shares the 80×140×26 mm envelope but catalogue C/C0 differ (88/85 kN vs 72.8/55 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6216-2RS1 shares the 80×140×26 mm envelope but catalogue C/C0 differ (88/85 kN vs 72.8/55 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6216DDU on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6216VV on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6216ZZ on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6216 on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216 on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80.5/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216LLU on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80.5/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216LLB on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80.5/53 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6216-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6216ZZ on the same 80×140×26 mm envelope, but catalogue C/C0 differ (88/85 kN vs 80.5/53 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "216-ZZ", "216-2Z" ], "locale_variants": {} }, { "sku": "316", "brand": "SKF", "manufacturer_designation": "316", "series": "300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 138, "static_load_kN": 129, "fatigue_load_limit_kN": 4.9, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "316 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 316 carries code 16 = 80 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 80×170×39 mm envelope its C 138 kN and C0 129 kN ratings (Pu 4.9 kN). The open 316 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 4300 r/min, mass 3950 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives", "material-handling winches" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Limiting speed is just 4300 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 80×170 mm envelope, which is why 316 reaches C 138 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 316, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "316 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 316 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 138/129 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Do not preload 316 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 316?", "a": "Filling-slot bearing 316 measures 80×170×39 mm (3.15×6.693×1.535 in), about 3950 g." }, { "q": "What does the designation 316 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 16 = 80 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 316 available sealed?", "a": "Shielded executions (-2Z, listed here as 316-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 138 kN for 316). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope as SKF 6316 M, but catalogue C/C0 differ (138/129 kN vs 130/86.5 kN) — envelope match only after a load check." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope and equivalent catalogue ratings; 316-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6316 shares the 80×170×39 mm envelope but catalogue C/C0 differ (138/129 kN vs 130/86.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6316-2Z shares the 80×170×39 mm envelope but catalogue C/C0 differ (138/129 kN vs 130/86.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6316-2RS1 shares the 80×170×39 mm envelope but catalogue C/C0 differ (138/129 kN vs 130/86.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6316DDU on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 135/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6316VV on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 135/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6316ZZ on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 135/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6316 on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 135/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6316 on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 136/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6316LLU on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 136/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6316LLB on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 136/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6316ZZ on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 136/86.5 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "316", "316" ], "locale_variants": {} }, { "sku": "316-ZZ", "brand": "SKF", "manufacturer_designation": "316-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 138, "static_load_kN": 129, "fatigue_load_limit_kN": 4.9, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3440, "max_rpm": 3440, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "316-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 316 carries code 16 = 80 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 80×170×39 mm envelope its C 138 kN and C0 129 kN ratings (Pu 4.9 kN). SKF spells the double shield 316-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 3440 r/min, mass 3950 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "316 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 316-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 138/129 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 316-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 3440 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 80×170 mm envelope, which is why 316-ZZ reaches C 138 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Fillet radii must clear the 316-ZZ chamfer so the 39 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 316-ZZ?", "a": "Filling-slot bearing 316-2Z measures 80×170×39 mm (3.15×6.693×1.535 in), about 3950 g." }, { "q": "What does the designation 316 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 16 = 80 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 138 kN for 316-ZZ). The slots also make the rings separable." }, { "q": "Can 316-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope as SKF 6316 M, but catalogue C/C0 differ (138/129 kN vs 130/86.5 kN) — envelope match only after a load check." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope and equivalent catalogue ratings; 316 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6316 shares the 80×170×39 mm envelope but catalogue C/C0 differ (138/129 kN vs 130/86.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6316-2Z shares the 80×170×39 mm envelope but catalogue C/C0 differ (138/129 kN vs 130/86.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6316-2RS1 shares the 80×170×39 mm envelope but catalogue C/C0 differ (138/129 kN vs 130/86.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6316DDU on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 135/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6316VV on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 135/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6316ZZ on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 135/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6316 on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 135/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6316 on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 136/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6316LLU on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 136/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6316LLB on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 136/86.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6316-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6316ZZ on the same 80×170×39 mm envelope, but catalogue C/C0 differ (138/129 kN vs 136/86.5 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "316-ZZ", "316-2Z" ], "locale_variants": {} }, { "sku": "217", "brand": "SKF", "manufacturer_designation": "217", "series": "200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.8, "static_load_kN": 100, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "217 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 217 carries code 17 = 85 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 85×150×28 mm envelope its C 96.8 kN and C0 100 kN ratings (Pu 3.9 kN). The open 217 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 4800 r/min, mass 1950 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Limiting speed is just 4800 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 85×150 mm envelope, which is why 217 reaches C 96.8 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 217, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "217 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 217 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 96.8/100 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Deep-groove geometry tolerates only minutes of misalignment; if the 150 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 217." ], "faq": [ { "q": "What are the dimensions of 217?", "a": "Filling-slot bearing 217 measures 85×150×28 mm (3.346×5.906×1.102 in), about 1950 g." }, { "q": "What does the designation 217 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 17 = 85 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 96.8 kN for 217). The slots also make the rings separable." }, { "q": "Can 217 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope as SKF 6217 M, but catalogue C/C0 differ (96.8/100 kN vs 87.1/64 kN) — envelope match only after a load check." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope and equivalent catalogue ratings; 217-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6217 shares the 85×150×28 mm envelope but catalogue C/C0 differ (96.8/100 kN vs 87.1/64 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6217-2Z shares the 85×150×28 mm envelope but catalogue C/C0 differ (96.8/100 kN vs 87.1/64 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6217-2RS1 shares the 85×150×28 mm envelope but catalogue C/C0 differ (96.8/100 kN vs 87.1/64 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6217DDU on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92.5/62 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6217VV on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92.5/62 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6217ZZ on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92.5/62 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6217 on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92.5/62 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6217 on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92/64 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6217LLU on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92/64 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6217LLB on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92/64 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6217ZZ on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92/64 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "217", "217" ], "locale_variants": {} }, { "sku": "217-ZZ", "brand": "SKF", "manufacturer_designation": "217-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.8, "static_load_kN": 100, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3900, "max_rpm": 3900, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "217-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 217 carries code 17 = 85 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 85×150×28 mm envelope its C 96.8 kN and C0 100 kN ratings (Pu 3.9 kN). SKF spells the double shield 217-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 3900 r/min, mass 1950 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Shields on 217-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 3900 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 85×150 mm envelope, which is why 217-ZZ reaches C 96.8 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 217-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Filling slots let more balls be packed into the 85×150 mm envelope, which is why 217-ZZ reaches C 96.8 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Catalogue ratings for 217-ZZ (C 96.8 kN, C0 100 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 217-ZZ?", "a": "Filling-slot bearing 217-2Z measures 85×150×28 mm (3.346×5.906×1.102 in), about 1950 g." }, { "q": "What does the designation 217 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 17 = 85 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 217-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope as SKF 6217 M, but catalogue C/C0 differ (96.8/100 kN vs 87.1/64 kN) — envelope match only after a load check." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope and equivalent catalogue ratings; 217 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6217 shares the 85×150×28 mm envelope but catalogue C/C0 differ (96.8/100 kN vs 87.1/64 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6217-2Z shares the 85×150×28 mm envelope but catalogue C/C0 differ (96.8/100 kN vs 87.1/64 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6217-2RS1 shares the 85×150×28 mm envelope but catalogue C/C0 differ (96.8/100 kN vs 87.1/64 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6217DDU on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92.5/62 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6217VV on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92.5/62 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6217ZZ on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92.5/62 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6217 on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92.5/62 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6217 on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92/64 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6217LLU on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92/64 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6217LLB on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92/64 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6217-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6217ZZ on the same 85×150×28 mm envelope, but catalogue C/C0 differ (96.8/100 kN vs 92/64 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "217-ZZ", "217-2Z" ], "locale_variants": {} }, { "sku": "317", "brand": "SKF", "manufacturer_designation": "317", "series": "300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 146, "fatigue_load_limit_kN": 5.3, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 4600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "317 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 317 carries code 17 = 85 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 85×180×41 mm envelope its C 147 kN and C0 146 kN ratings (Pu 5.3 kN). The open 317 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 4000 r/min, mass 4600 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters", "construction equipment drives" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Filling slots let more balls be packed into the 85×180 mm envelope, which is why 317 reaches C 147 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 317, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "317 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 317 exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 147/146 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "317 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 317 exactly when ordering replacements.", "Deep-groove geometry tolerates only minutes of misalignment; if the 180 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 317." ], "faq": [ { "q": "What are the dimensions of 317?", "a": "Filling-slot bearing 317 measures 85×180×41 mm (3.346×7.087×1.614 in), about 4600 g." }, { "q": "What does the designation 317 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 17 = 85 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 317?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 4000 r/min limiting speed are the typical failure modes." }, { "q": "Is 317 available sealed?", "a": "Shielded executions (-2Z, listed here as 317-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope as SKF 6317 M, but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match only after a load check." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope and equivalent catalogue ratings; 317-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6317 shares the 85×180×41 mm envelope but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6317-2RS1 shares the 85×180×41 mm envelope but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6317DDU on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 146/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6317VV on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 146/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6317ZZ on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 146/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6317 on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 146/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6317 on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 147/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6317LLU on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 147/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6317LLB on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 147/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6317ZZ on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 147/97 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "317", "317" ], "locale_variants": {} }, { "sku": "317-ZZ", "brand": "SKF", "manufacturer_designation": "317-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 146, "fatigue_load_limit_kN": 5.3, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "317-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 317 carries code 17 = 85 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 85×180×41 mm envelope its C 147 kN and C0 146 kN ratings (Pu 5.3 kN). SKF spells the double shield 317-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 3200 r/min, mass 4600 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 147/146 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 317-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 3200 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 85×180 mm envelope, which is why 317-ZZ reaches C 147 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 317-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "The fatigue load limit is 5.3 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of 317-ZZ?", "a": "Filling-slot bearing 317-2Z measures 85×180×41 mm (3.346×7.087×1.614 in), about 4600 g." }, { "q": "What does the designation 317 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 17 = 85 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 317-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope as SKF 6317 M, but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match only after a load check." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope and equivalent catalogue ratings; 317 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6317 shares the 85×180×41 mm envelope but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6317-2RS1 shares the 85×180×41 mm envelope but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6317DDU on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 146/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6317VV on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 146/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6317ZZ on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 146/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6317 on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 146/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6317 on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 147/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6317LLU on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 147/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6317LLB on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 147/97 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6317-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6317ZZ on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 147/97 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "317-ZZ", "317-2Z" ], "locale_variants": {} }, { "sku": "218", "brand": "SKF", "manufacturer_designation": "218", "series": "200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 114, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 2350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "218 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 218 carries code 18 = 90 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 90×160×30 mm envelope its C 112 kN and C0 114 kN ratings (Pu 4.3 kN). The open 218 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 4300 r/min, mass 2350 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "legacy machinery repairs", "slew drives", "material-handling winches", "slow heavy gearboxes" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Shields on 218 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4300 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 90×160 mm envelope, which is why 218 reaches C 112 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 218, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Filling slots let more balls be packed into the 90×160 mm envelope, which is why 218 reaches C 112 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "Catalogue ratings for 218 (C 112 kN, C0 114 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 218?", "a": "Filling-slot bearing 218 measures 90×160×30 mm (3.543×6.299×1.181 in), about 2350 g." }, { "q": "What does the designation 218 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 18 = 90 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What fails on 218?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 4300 r/min limiting speed are the typical failure modes." }, { "q": "Is 218 available sealed?", "a": "Shielded executions (-2Z, listed here as 218-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." } ], "cross_ref": [ { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope as SKF 6218 M, but catalogue C/C0 differ (112/114 kN vs 101/73.5 kN) — envelope match only after a load check." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope and equivalent catalogue ratings; 218-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6218 shares the 90×160×30 mm envelope but catalogue C/C0 differ (112/114 kN vs 101/73.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6218-2Z shares the 90×160×30 mm envelope but catalogue C/C0 differ (112/114 kN vs 101/73.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6218-2RS1 shares the 90×160×30 mm envelope but catalogue C/C0 differ (112/114 kN vs 101/73.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6218DDU on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6218VV on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6218ZZ on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6218 on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6218 on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6218LLU on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6218LLB on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6218ZZ on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "218", "218" ], "locale_variants": {} }, { "sku": "218-ZZ", "brand": "SKF", "manufacturer_designation": "218-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 114, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 2350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "218-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 218 carries code 18 = 90 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 90×160×30 mm envelope its C 112 kN and C0 114 kN ratings (Pu 4.3 kN). SKF spells the double shield 218-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4300 r/min, mass 2350 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "eccentric and vibratory conveyors", "legacy machinery repairs", "slew drives", "material-handling winches" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Limiting speed is just 4300 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 90×160 mm envelope, which is why 218-ZZ reaches C 112 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 218-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "218 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 218-2Z exactly when ordering replacements.", "The slots sit at one angular position: on 218-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Deep-groove geometry tolerates only minutes of misalignment; if the 160 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 218-ZZ." ], "faq": [ { "q": "What are the dimensions of 218-ZZ?", "a": "Filling-slot bearing 218-2Z measures 90×160×30 mm (3.543×6.299×1.181 in), about 2350 g." }, { "q": "What does the designation 218 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 18 = 90 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." }, { "q": "What fails on 218-ZZ?", "a": "Slot-edge chipping under thrust or shock, dirt ingress in the open design and cage wear past the 4300 r/min limiting speed are the typical failure modes." } ], "cross_ref": [ { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope as SKF 6218 M, but catalogue C/C0 differ (112/114 kN vs 101/73.5 kN) — envelope match only after a load check." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope and equivalent catalogue ratings; 218 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6218 shares the 90×160×30 mm envelope but catalogue C/C0 differ (112/114 kN vs 101/73.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6218-2Z shares the 90×160×30 mm envelope but catalogue C/C0 differ (112/114 kN vs 101/73.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6218-2RS1 shares the 90×160×30 mm envelope but catalogue C/C0 differ (112/114 kN vs 101/73.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6218DDU on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6218VV on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6218ZZ on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6218 on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6218 on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6218LLU on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6218LLB on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6218-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6218ZZ on the same 90×160×30 mm envelope, but catalogue C/C0 differ (112/114 kN vs 106/71.5 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "218-ZZ", "218-2Z" ], "locale_variants": {} }, { "sku": "318", "brand": "SKF", "manufacturer_designation": "318", "series": "300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 157, "static_load_kN": 160, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 5400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "318 is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 318 carries code 18 = 90 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 90×190×43 mm envelope its C 157 kN and C0 160 kN ratings (Pu 5.7 kN). The open 318 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 4000 r/min, mass 5400 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slew drives", "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 157/160 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 318 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 90×190 mm envelope, which is why 318 reaches C 157 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 318, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Fillet radii must clear the 318 chamfer so the 43 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 318?", "a": "Filling-slot bearing 318 measures 90×190×43 mm (3.543×7.48×1.693 in), about 5400 g." }, { "q": "What does the designation 318 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 18 = 90 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 157 kN for 318). The slots also make the rings separable." }, { "q": "Can 318 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." } ], "cross_ref": [ { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope as SKF 6318 M, but catalogue C/C0 differ (157/160 kN vs 151/108 kN) — envelope match only after a load check." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope and equivalent catalogue ratings; 318-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6318 shares the 90×190×43 mm envelope but catalogue C/C0 differ (157/160 kN vs 151/108 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6318-2Z shares the 90×190×43 mm envelope but catalogue C/C0 differ (157/160 kN vs 151/108 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6318-2RS1 shares the 90×190×43 mm envelope but catalogue C/C0 differ (157/160 kN vs 151/108 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6318DDU on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 157/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6318VV on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 157/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6318ZZ on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 157/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6318 on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 157/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6318 on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 158/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6318LLU on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 158/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6318LLB on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 158/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6318ZZ on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 158/107 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "318", "318" ], "locale_variants": {} }, { "sku": "318-ZZ", "brand": "SKF", "manufacturer_designation": "318-2Z", "series": "300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 157, "static_load_kN": 160, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 5400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "318-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 318 carries code 18 = 90 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 90×190×43 mm envelope its C 157 kN and C0 160 kN ratings (Pu 5.7 kN). SKF spells the double shield 318-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 3200 r/min, mass 5400 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Shields on 318-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 3200 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 90×190 mm envelope, which is why 318-ZZ reaches C 157 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 318-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "318 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 318-2Z exactly when ordering replacements.", "Catalogue ratings for 318-ZZ (C 157 kN, C0 160 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 318-ZZ?", "a": "Filling-slot bearing 318-2Z measures 90×190×43 mm (3.543×7.48×1.693 in), about 5400 g." }, { "q": "What does the designation 318 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 300 and bore code 18 = 90 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 318-ZZ take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 300-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope as SKF 6318 M, but catalogue C/C0 differ (157/160 kN vs 151/108 kN) — envelope match only after a load check." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope and equivalent catalogue ratings; 318 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6318 shares the 90×190×43 mm envelope but catalogue C/C0 differ (157/160 kN vs 151/108 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6318-2Z shares the 90×190×43 mm envelope but catalogue C/C0 differ (157/160 kN vs 151/108 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6318-2RS1 shares the 90×190×43 mm envelope but catalogue C/C0 differ (157/160 kN vs 151/108 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6318DDU on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 157/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6318VV on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 157/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6318ZZ on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 157/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6318 on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 157/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6318 on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 158/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6318LLU on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 158/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6318LLB on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 158/107 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6318-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6318ZZ on the same 90×190×43 mm envelope, but catalogue C/C0 differ (157/160 kN vs 158/107 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "318-ZZ", "318-2Z" ], "locale_variants": {} }, { "sku": "219", "brand": "SKF", "manufacturer_designation": "219", "series": "200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 122, "fatigue_load_limit_kN": 4.5, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "219 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 219 carries code 19 = 95 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 95×170×32 mm envelope its C 121 kN and C0 122 kN ratings (Pu 4.5 kN). The open 219 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 4000 r/min, mass 2700 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors", "legacy machinery repairs" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 121/122 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 219 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 95×170 mm envelope, which is why 219 reaches C 121 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 219, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Mount by heating the inner ring (max 120 °C) — driving 219 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 219?", "a": "Filling-slot bearing 219 measures 95×170×32 mm (3.74×6.693×1.26 in), about 2700 g." }, { "q": "What does the designation 219 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 19 = 95 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 219 available sealed?", "a": "Shielded executions (-2Z, listed here as 219-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 121 kN for 219). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope as SKF 6219 M, but catalogue C/C0 differ (121/122 kN vs 114/81.5 kN) — envelope match only after a load check." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope and equivalent catalogue ratings; 219-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6219 shares the 95×170×32 mm envelope but catalogue C/C0 differ (121/122 kN vs 114/81.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6219-2Z shares the 95×170×32 mm envelope but catalogue C/C0 differ (121/122 kN vs 114/81.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6219-2RS1 shares the 95×170×32 mm envelope but catalogue C/C0 differ (121/122 kN vs 114/81.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6219DDU on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 120/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6219VV on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 120/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6219ZZ on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 120/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6219 on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 120/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6219 on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 121/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6219LLU on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 121/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6219LLB on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 121/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6219ZZ on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 121/82 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "219", "219" ], "locale_variants": {} }, { "sku": "219-ZZ", "brand": "SKF", "manufacturer_designation": "219-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 122, "fatigue_load_limit_kN": 4.5, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "219-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 219 carries code 19 = 95 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 95×170×32 mm envelope its C 121 kN and C0 122 kN ratings (Pu 4.5 kN). SKF spells the double shield 219-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4000 r/min, mass 2700 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "legacy machinery repairs", "slew drives", "material-handling winches", "slow heavy gearboxes" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "219 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 219-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 121/122 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 219-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Shields on 219-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Do not preload 219-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 219-ZZ?", "a": "Filling-slot bearing 219-2Z measures 95×170×32 mm (3.74×6.693×1.26 in), about 2700 g." }, { "q": "What does the designation 219 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 19 = 95 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 219-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 219-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 121 kN for 219-ZZ). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope as SKF 6219 M, but catalogue C/C0 differ (121/122 kN vs 114/81.5 kN) — envelope match only after a load check." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope and equivalent catalogue ratings; 219 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6219 shares the 95×170×32 mm envelope but catalogue C/C0 differ (121/122 kN vs 114/81.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6219-2Z shares the 95×170×32 mm envelope but catalogue C/C0 differ (121/122 kN vs 114/81.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6219-2RS1 shares the 95×170×32 mm envelope but catalogue C/C0 differ (121/122 kN vs 114/81.5 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6219DDU on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 120/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6219VV on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 120/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6219ZZ on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 120/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6219 on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 120/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6219 on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 121/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6219LLU on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 121/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6219LLB on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 121/82 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6219-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6219ZZ on the same 95×170×32 mm envelope, but catalogue C/C0 differ (121/122 kN vs 121/82 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "219-ZZ", "219-2Z" ], "locale_variants": {} }, { "sku": "220", "brand": "SKF", "manufacturer_designation": "220", "series": "200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 134, "static_load_kN": 140, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "220 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 220 carries code 20 = 100 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 100×180×34 mm envelope its C 134 kN and C0 140 kN ratings (Pu 5 kN). The open 220 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 4000 r/min, mass 3450 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "slew drives", "material-handling winches", "slow heavy gearboxes", "farm machinery and harvesters" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 134/140 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 220 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Filling slots let more balls be packed into the 100×180 mm envelope, which is why 220 reaches C 134 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.", "The slots sit at one angular position: on 220, never pass the full radial load across the slot zone during mounting or the ring lip can crack.", "Do not preload 220 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 220?", "a": "Filling-slot bearing 220 measures 100×180×34 mm (3.937×7.087×1.339 in), about 3450 g." }, { "q": "What does the designation 220 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 20 = 100 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Can 220 take axial load?", "a": "Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads." }, { "q": "Why use an old 200-series bearing instead of a 62xx?", "a": "For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better." } ], "cross_ref": [ { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope as SKF 6220 M, but catalogue C/C0 differ (134/140 kN vs 127/93 kN) — envelope match only after a load check." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope and equivalent catalogue ratings; 220-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6220 shares the 100×180×34 mm envelope but catalogue C/C0 differ (134/140 kN vs 127/93 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6220-2Z shares the 100×180×34 mm envelope but catalogue C/C0 differ (134/140 kN vs 127/93 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6220-2RS1 shares the 100×180×34 mm envelope but catalogue C/C0 differ (134/140 kN vs 127/93 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6220DDU on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 134/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6220VV on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 134/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6220ZZ on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 134/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6220 on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 134/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6220 on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 135/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6220LLU on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 135/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6220LLB on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 135/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6220ZZ on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 135/93 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "220", "220" ], "locale_variants": {} }, { "sku": "220-ZZ", "brand": "SKF", "manufacturer_designation": "220-2Z", "series": "200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 134, "static_load_kN": 140, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "220-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 220 carries code 20 = 100 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 100×180×34 mm envelope its C 134 kN and C0 140 kN ratings (Pu 5 kN). SKF spells the double shield 220-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 4000 r/min, mass 3450 g. These bearings are built for high purely-radial loads at moderate speeds.", "applications": [ "farm machinery and harvesters", "construction equipment drives", "hoists and winch gear trains", "eccentric and vibratory conveyors" ], "failure_modes": [ "spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading", "dirt entering through the open slot area when external sealing is neglected", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "220 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 220-2Z exactly when ordering replacements.", "Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 134/140 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.", "Shields on 220-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Limiting speed is just 4000 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.", "Shields on 220-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.", "Deep-groove geometry tolerates only minutes of misalignment; if the 180 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 220-ZZ." ], "faq": [ { "q": "What are the dimensions of 220-ZZ?", "a": "Filling-slot bearing 220-2Z measures 100×180×34 mm (3.937×7.087×1.339 in), about 3450 g." }, { "q": "What does the designation 220 mean?", "a": "It is the legacy 200/300 filling-slot numbering: series 200 and bore code 20 = 100 mm. Filling-slot bearings predate the 6xxx deep-groove spelling." }, { "q": "Is 220-ZZ available sealed?", "a": "Shielded executions (-2Z, listed here as 220-ZZ) exist; contact-sealed versions are generally not produced for the filling-slot family." }, { "q": "What is a filling-slot bearing?", "a": "The inner and outer rings each have a loading slot; when aligned, extra balls can be inserted, raising radial rating (C 134 kN for 220-ZZ). The slots also make the rings separable." } ], "cross_ref": [ { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope as SKF 6220 M, but catalogue C/C0 differ (134/140 kN vs 127/93 kN) — envelope match only after a load check." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope and equivalent catalogue ratings; 220 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6220 shares the 100×180×34 mm envelope but catalogue C/C0 differ (134/140 kN vs 127/93 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6220-2Z shares the 100×180×34 mm envelope but catalogue C/C0 differ (134/140 kN vs 127/93 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6220-2RS1 shares the 100×180×34 mm envelope but catalogue C/C0 differ (134/140 kN vs 127/93 kN) — envelope match, not a load-rating equivalent." }, { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6220DDU on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 134/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6220VV on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 134/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6220ZZ on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 134/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6220 on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 134/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6220 on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 135/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6220LLU on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 135/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6220LLB on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 135/93 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6220-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6220ZZ on the same 100×180×34 mm envelope, but catalogue C/C0 differ (134/140 kN vs 135/93 kN) — envelope interchange only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "220-ZZ", "220-2Z" ], "locale_variants": {} }, { "sku": "4200-ATN9", "brand": "SKF", "manufacturer_designation": "4200 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 9.23, "static_load_kN": 5.2, "fatigue_load_limit_kN": 0.224, "reference_speed_rpm": 40000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 49, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4200 ATN9 is a double-row deep-groove ball bearing in the 4200-series: bore code 00 follows the 10/12/15/17 mm exception table, so 4200 fits a 10 mm shaft. Two complete ball sets share the 10×30×14 mm (0.394×1.181×0.551 in) envelope, giving C 9.23 kN, C0 5.2 kN and Pu 0.224 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 22000 r/min, mass 49 g. The arrangement is open and requires external sealing.", "applications": [ "belt take-up and tensioner units", "machine tool feed drives", "lifting and hoisting gear", "fans with axial thrust reversals" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "C 9.23 kN in a 14 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4200-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 10 mm position.", "Two deep-groove raceways in 4200-ATN9 share the load but need parallel seats; tilting the 14 mm-wide assembly loads one row heavily and can spall it early.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4200-ATN9 is sensitive to cocking during pressing.", "Do not preload 4200-ATN9 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 4200-ATN9?", "a": "Double-row 4200 ATN9 measures 10×30×14 mm (0.394×1.181×0.551 in), about 49 g." }, { "q": "What does ATN9 mean on 4200 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Is 4200-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 10×30×14 mm is its own envelope." }, { "q": "Does 4200-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 22000 r/min; the two cages and wider grease volume generate more drag than a single-row 6200." } ], "cross_ref": [ { "equiv_sku": "62200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×14 mm envelope as SKF 62200-2RS1, but catalogue C/C0 differ (9.23/5.2 kN vs 5.07/2.36 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4200-ATN9", "4200 ATN9" ], "locale_variants": {} }, { "sku": "4201-ATN9", "brand": "SKF", "manufacturer_designation": "4201 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 10.6, "static_load_kN": 6.2, "fatigue_load_limit_kN": 0.26, "reference_speed_rpm": 36000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 52, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4201 ATN9 is a double-row deep-groove ball bearing in the 4200-series: bore code 01 follows the 10/12/15/17 mm exception table, so 4201 fits a 12 mm shaft. Two complete ball sets share the 12×32×14 mm (0.472×1.26×0.551 in) envelope, giving C 10.6 kN, C0 6.2 kN and Pu 0.26 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 20000 r/min, mass 52 g. The arrangement is open and requires external sealing.", "applications": [ "agricultural gearboxes", "belt take-up and tensioner units", "machine tool feed drives", "lifting and hoisting gear" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Double-row 4201 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 10.6 kN in a 14 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4201-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 12 mm position.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 12 mm position.", "Clearance suffixes follow the seal code in the designation stack (e.g. 4201-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 4201-ATN9?", "a": "Double-row 4201 ATN9 measures 12×32×14 mm (0.472×1.26×0.551 in), about 52 g." }, { "q": "What does ATN9 mean on 4201 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (10.6 kN for 4201-ATN9), reversing axial capacity and some moment stiffness in one 14 mm-wide unit — useful on gearbox layshafts and pump shafts." }, { "q": "Is 4201-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 12×32×14 mm is its own envelope." } ], "cross_ref": [ { "equiv_sku": "62201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×14 mm envelope as SKF 62201-2RS1, but catalogue C/C0 differ (10.6/6.2 kN vs 6.89/3.1 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4201-ATN9", "4201 ATN9" ], "locale_variants": {} }, { "sku": "4301-ATN9", "brand": "SKF", "manufacturer_designation": "4301 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 13, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 34000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 92, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4301 ATN9 is a double-row deep-groove ball bearing in the 4300-series: bore code 01 follows the 10/12/15/17 mm exception table, so 4301 fits a 12 mm shaft. Two complete ball sets share the 12×37×17 mm (0.472×1.457×0.669 in) envelope, giving C 13 kN, C0 7.8 kN and Pu 0.325 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 18000 r/min, mass 92 g. The arrangement is open and requires external sealing.", "applications": [ "belt take-up and tensioner units", "machine tool feed drives", "lifting and hoisting gear", "fans with axial thrust reversals" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 12 mm position.", "Two deep-groove raceways in 4301-ATN9 share the load but need parallel seats; tilting the 17 mm-wide assembly loads one row heavily and can spall it early.", "The wide 12×37×17 mm envelope is not interchangeable with a single-row 6201 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4301 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "Double-row 4301 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "Fillet radii must clear the 4301-ATN9 chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 4301-ATN9?", "a": "Double-row 4301 ATN9 measures 12×37×17 mm (0.472×1.457×0.669 in), about 92 g." }, { "q": "What does ATN9 mean on 4301 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Does 4301-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 18000 r/min; the two cages and wider grease volume generate more drag than a single-row 6201." }, { "q": "How is 4301-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." } ], "cross_ref": [ { "equiv_sku": "62301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×17 mm envelope as SKF 62301-2RS1, but catalogue C/C0 differ (13/7.8 kN vs 9.75/4.15 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4301-ATN9", "4301 ATN9" ], "locale_variants": {} }, { "sku": "4202-ATN9", "brand": "SKF", "manufacturer_designation": "4202 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 11.9, "static_load_kN": 7.5, "fatigue_load_limit_kN": 0.32, "reference_speed_rpm": 32000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 59, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4202 ATN9 is a double-row deep-groove ball bearing in the 4200-series: bore code 02 follows the 10/12/15/17 mm exception table, so 4202 fits a 15 mm shaft. Two complete ball sets share the 15×35×14 mm (0.591×1.378×0.551 in) envelope, giving C 11.9 kN, C0 7.5 kN and Pu 0.32 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 17000 r/min, mass 59 g. The arrangement is open and requires external sealing.", "applications": [ "gearbox layshafts with reversing axial load", "agricultural gearboxes", "belt take-up and tensioner units", "machine tool feed drives" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "C 11.9 kN in a 14 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4202-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 15 mm position.", "Two deep-groove raceways in 4202-ATN9 share the load but need parallel seats; tilting the 14 mm-wide assembly loads one row heavily and can spall it early.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4202-ATN9 is sensitive to cocking during pressing.", "The fatigue load limit is 0.32 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of 4202-ATN9?", "a": "Double-row 4202 ATN9 measures 15×35×14 mm (0.591×1.378×0.551 in), about 59 g." }, { "q": "What does ATN9 mean on 4202 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "How is 4202-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." }, { "q": "What load does 4202-ATN9 carry?", "a": "C 11.9 kN, C0 7.5 kN and Pu 0.32 kN per catalogue 17000; both rows share the load when the rings sit parallel." } ], "cross_ref": [ { "equiv_sku": "62202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×14 mm envelope as SKF 62202-2RS1, but catalogue C/C0 differ (11.9/7.5 kN vs 7.8/3.75 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4202-ATN9", "4202 ATN9" ], "locale_variants": {} }, { "sku": "4302-ATN9", "brand": "SKF", "manufacturer_designation": "4302 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 14.8, "static_load_kN": 9.5, "fatigue_load_limit_kN": 0.405, "reference_speed_rpm": 28000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4302 ATN9 is a double-row deep-groove ball bearing in the 4300-series: bore code 02 follows the 10/12/15/17 mm exception table, so 4302 fits a 15 mm shaft. Two complete ball sets share the 15×42×17 mm (0.591×1.654×0.669 in) envelope, giving C 14.8 kN, C0 9.5 kN and Pu 0.405 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 15000 r/min, mass 120 g. The arrangement is open and requires external sealing.", "applications": [ "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load", "agricultural gearboxes", "belt take-up and tensioner units" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Two deep-groove raceways in 4302-ATN9 share the load but need parallel seats; tilting the 17 mm-wide assembly loads one row heavily and can spall it early.", "The wide 15×42×17 mm envelope is not interchangeable with a single-row 6202 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4302 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 14.8 kN in a 17 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "The wide 15×42×17 mm envelope is not interchangeable with a single-row 6202 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Clearance suffixes follow the seal code in the designation stack (e.g. 4302-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 4302-ATN9?", "a": "Double-row 4302 ATN9 measures 15×42×17 mm (0.591×1.654×0.669 in), about 120 g." }, { "q": "What does ATN9 mean on 4302 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Does 4302-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 15000 r/min; the two cages and wider grease volume generate more drag than a single-row 6202." }, { "q": "How is 4302-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." } ], "cross_ref": [ { "equiv_sku": "62302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×17 mm envelope as SKF 62302-2RS1, but catalogue C/C0 differ (14.8/9.5 kN vs 11.4/5.4 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4302-ATN9", "4302 ATN9" ], "locale_variants": {} }, { "sku": "4203-ATN9", "brand": "SKF", "manufacturer_designation": "4203 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 14.8, "static_load_kN": 9.5, "fatigue_load_limit_kN": 0.405, "reference_speed_rpm": 28000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 90, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4203 ATN9 is a double-row deep-groove ball bearing in the 4200-series: bore code 03 follows the 10/12/15/17 mm exception table, so 4203 fits a 17 mm shaft. Two complete ball sets share the 17×40×16 mm (0.669×1.575×0.63 in) envelope, giving C 14.8 kN, C0 9.5 kN and Pu 0.405 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 15000 r/min, mass 90 g. The arrangement is open and requires external sealing.", "applications": [ "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load", "agricultural gearboxes", "belt take-up and tensioner units" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Double-row 4203 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 14.8 kN in a 16 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4203-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 17 mm position.", "C 14.8 kN in a 16 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Do not preload 4203-ATN9 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 4203-ATN9?", "a": "Double-row 4203 ATN9 measures 17×40×16 mm (0.669×1.575×0.63 in), about 90 g." }, { "q": "What does ATN9 mean on 4203 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "How is 4203-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." }, { "q": "What load does 4203-ATN9 carry?", "a": "C 14.8 kN, C0 9.5 kN and Pu 0.405 kN per catalogue 17000; both rows share the load when the rings sit parallel." } ], "cross_ref": [ { "equiv_sku": "62203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×16 mm envelope as SKF 62203-2RS1, but catalogue C/C0 differ (14.8/9.5 kN vs 9.56/4.75 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4203-ATN9", "4203 ATN9" ], "locale_variants": {} }, { "sku": "4303-ATN9", "brand": "SKF", "manufacturer_designation": "4303 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 19.5, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4303 ATN9 is a double-row deep-groove ball bearing in the 4300-series: bore code 03 follows the 10/12/15/17 mm exception table, so 4303 fits a 17 mm shaft. Two complete ball sets share the 17×47×19 mm (0.669×1.85×0.748 in) envelope, giving C 19.5 kN, C0 13.2 kN and Pu 0.56 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 13000 r/min, mass 160 g. The arrangement is open and requires external sealing.", "applications": [ "gearbox layshafts with reversing axial load", "agricultural gearboxes", "belt take-up and tensioner units", "machine tool feed drives" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 17 mm position.", "Two deep-groove raceways in 4303-ATN9 share the load but need parallel seats; tilting the 19 mm-wide assembly loads one row heavily and can spall it early.", "The wide 17×47×19 mm envelope is not interchangeable with a single-row 6203 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4303 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4303-ATN9 is sensitive to cocking during pressing.", "Catalogue ratings for 4303-ATN9 (C 19.5 kN, C0 13.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 4303-ATN9?", "a": "Double-row 4303 ATN9 measures 17×47×19 mm (0.669×1.85×0.748 in), about 160 g." }, { "q": "What does ATN9 mean on 4303 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "How is 4303-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." }, { "q": "What load does 4303-ATN9 carry?", "a": "C 19.5 kN, C0 13.2 kN and Pu 0.56 kN per catalogue 17000; both rows share the load when the rings sit parallel." } ], "cross_ref": [ { "equiv_sku": "62303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×19 mm envelope as SKF 62303-2RS1, but catalogue C/C0 differ (19.5/13.2 kN vs 13.5/6.55 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4303-ATN9", "4303 ATN9" ], "locale_variants": {} }, { "sku": "4204-ATN9", "brand": "SKF", "manufacturer_designation": "4204 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 17.8, "static_load_kN": 12.5, "fatigue_load_limit_kN": 0.53, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4204 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4204 carries code 04 = 20 mm (code × 5). Two complete ball sets share the 20×47×18 mm (0.787×1.85×0.709 in) envelope, giving C 17.8 kN, C0 12.5 kN and Pu 0.53 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 13000 r/min, mass 140 g. The arrangement is open and requires external sealing.", "applications": [ "industrial wheel arrangements", "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load", "agricultural gearboxes" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "C 17.8 kN in a 18 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4204-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 20 mm position.", "Two deep-groove raceways in 4204-ATN9 share the load but need parallel seats; tilting the 18 mm-wide assembly loads one row heavily and can spall it early.", "Two deep-groove raceways in 4204-ATN9 share the load but need parallel seats; tilting the 18 mm-wide assembly loads one row heavily and can spall it early.", "Do not preload 4204-ATN9 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 4204-ATN9?", "a": "Double-row 4204 ATN9 measures 20×47×18 mm (0.787×1.85×0.709 in), about 140 g." }, { "q": "What does ATN9 mean on 4204 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (17.8 kN for 4204-ATN9), reversing axial capacity and some moment stiffness in one 18 mm-wide unit — useful on gearbox layshafts and pump shafts." }, { "q": "Is 4204-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 20×47×18 mm is its own envelope." } ], "cross_ref": [ { "equiv_sku": "62204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×47×18 mm envelope as SKF 62204-2RS1, but catalogue C/C0 differ (17.8/12.5 kN vs 12.7/6.55 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4204-ATN9", "4204 ATN9" ], "locale_variants": {} }, { "sku": "4304-ATN9", "brand": "SKF", "manufacturer_designation": "4304 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 23.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "reference_speed_rpm": 22000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4304 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4304 carries code 04 = 20 mm (code × 5). Two complete ball sets share the 20×52×21 mm (0.787×2.047×0.827 in) envelope, giving C 23.4 kN, C0 16 kN and Pu 0.68 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 12000 r/min, mass 210 g. The arrangement is open and requires external sealing.", "applications": [ "fans with axial thrust reversals", "industrial wheel arrangements", "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4304-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 20 mm position.", "Two deep-groove raceways in 4304-ATN9 share the load but need parallel seats; tilting the 21 mm-wide assembly loads one row heavily and can spall it early.", "The wide 20×52×21 mm envelope is not interchangeable with a single-row 6204 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 20 mm position.", "Mount by heating the inner ring (max 120 °C) — driving 4304-ATN9 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 4304-ATN9?", "a": "Double-row 4304 ATN9 measures 20×52×21 mm (0.787×2.047×0.827 in), about 210 g." }, { "q": "What does ATN9 mean on 4304 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "How is 4304-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." }, { "q": "What load does 4304-ATN9 carry?", "a": "C 23.4 kN, C0 16 kN and Pu 0.68 kN per catalogue 17000; both rows share the load when the rings sit parallel." } ], "cross_ref": [ { "equiv_sku": "62304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×52×21 mm envelope as SKF 62304-2RS1, but catalogue C/C0 differ (23.4/16 kN vs 15.9/7.8 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4304-ATN9", "4304 ATN9" ], "locale_variants": {} }, { "sku": "4205-ATN9", "brand": "SKF", "manufacturer_designation": "4205 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 19, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.62, "reference_speed_rpm": 20000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4205 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4205 carries code 05 = 25 mm (code × 5). Two complete ball sets share the 25×52×18 mm (0.984×2.047×0.709 in) envelope, giving C 19 kN, C0 14.6 kN and Pu 0.62 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 11000 r/min, mass 170 g. The arrangement is open and requires external sealing.", "applications": [ "fans with axial thrust reversals", "industrial wheel arrangements", "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Double-row 4205 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 19 kN in a 18 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4205-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 25 mm position.", "The wide 25×52×18 mm envelope is not interchangeable with a single-row 6205 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Fillet radii must clear the 4205-ATN9 chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 4205-ATN9?", "a": "Double-row 4205 ATN9 measures 25×52×18 mm (0.984×2.047×0.709 in), about 170 g." }, { "q": "What does ATN9 mean on 4205 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (19 kN for 4205-ATN9), reversing axial capacity and some moment stiffness in one 18 mm-wide unit — useful on gearbox layshafts and pump shafts." }, { "q": "Is 4205-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 25×52×18 mm is its own envelope." } ], "cross_ref": [ { "equiv_sku": "62205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×52×18 mm envelope as SKF 62205-2RS1, but catalogue C/C0 differ (19/14.6 kN vs 14/7.8 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4205-ATN9", "4205 ATN9" ], "locale_variants": {} }, { "sku": "4305-ATN9", "brand": "SKF", "manufacturer_designation": "4305 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 31.9, "static_load_kN": 22.4, "fatigue_load_limit_kN": 0.95, "reference_speed_rpm": 18000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 340, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4305 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4305 carries code 05 = 25 mm (code × 5). Two complete ball sets share the 25×62×24 mm (0.984×2.441×0.945 in) envelope, giving C 31.9 kN, C0 22.4 kN and Pu 0.95 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 10000 r/min, mass 340 g. The arrangement is open and requires external sealing.", "applications": [ "industrial wheel arrangements", "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load", "agricultural gearboxes" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 25 mm position.", "Two deep-groove raceways in 4305-ATN9 share the load but need parallel seats; tilting the 24 mm-wide assembly loads one row heavily and can spall it early.", "The wide 25×62×24 mm envelope is not interchangeable with a single-row 6205 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4305 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4305-ATN9 is sensitive to cocking during pressing.", "The fatigue load limit is 0.95 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of 4305-ATN9?", "a": "Double-row 4305 ATN9 measures 25×62×24 mm (0.984×2.441×0.945 in), about 340 g." }, { "q": "What does ATN9 mean on 4305 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "How is 4305-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." }, { "q": "What load does 4305-ATN9 carry?", "a": "C 31.9 kN, C0 22.4 kN and Pu 0.95 kN per catalogue 17000; both rows share the load when the rings sit parallel." } ], "cross_ref": [ { "equiv_sku": "62305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×62×24 mm envelope as SKF 62305-2RS1, but catalogue C/C0 differ (31.9/22.4 kN vs 22.5/11.6 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4305-ATN9", "4305 ATN9" ], "locale_variants": {} }, { "sku": "4206-ATN9", "brand": "SKF", "manufacturer_designation": "4206 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 26, "static_load_kN": 20.8, "fatigue_load_limit_kN": 0.88, "reference_speed_rpm": 17000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 290, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4206 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4206 carries code 06 = 30 mm (code × 5). Two complete ball sets share the 30×62×20 mm (1.181×2.441×0.787 in) envelope, giving C 26 kN, C0 20.8 kN and Pu 0.88 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 9500 r/min, mass 290 g. The arrangement is open and requires external sealing.", "applications": [ "lifting and hoisting gear", "fans with axial thrust reversals", "industrial wheel arrangements", "double-supported pump impeller shafts" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "C 26 kN in a 20 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4206-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 30 mm position.", "Two deep-groove raceways in 4206-ATN9 share the load but need parallel seats; tilting the 20 mm-wide assembly loads one row heavily and can spall it early.", "Double-row 4206 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "Fillet radii must clear the 4206-ATN9 chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 4206-ATN9?", "a": "Double-row 4206 ATN9 measures 30×62×20 mm (1.181×2.441×0.787 in), about 290 g." }, { "q": "What does ATN9 mean on 4206 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (26 kN for 4206-ATN9), reversing axial capacity and some moment stiffness in one 20 mm-wide unit — useful on gearbox layshafts and pump shafts." }, { "q": "Is 4206-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 30×62×20 mm is its own envelope." } ], "cross_ref": [ { "equiv_sku": "62206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×62×20 mm envelope as SKF 62206-2RS1, but catalogue C/C0 differ (26/20.8 kN vs 19.5/11.2 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4206-ATN9", "4206 ATN9" ], "locale_variants": {} }, { "sku": "4306-ATN9", "brand": "SKF", "manufacturer_designation": "4306 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 41, "static_load_kN": 30, "fatigue_load_limit_kN": 1.27, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4306 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4306 carries code 06 = 30 mm (code × 5). Two complete ball sets share the 30×72×27 mm (1.181×2.835×1.063 in) envelope, giving C 41 kN, C0 30 kN and Pu 1.27 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 8500 r/min, mass 500 g. The arrangement is open and requires external sealing.", "applications": [ "machine tool feed drives", "lifting and hoisting gear", "fans with axial thrust reversals", "industrial wheel arrangements" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Double-row 4306 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 41 kN in a 27 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4306-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 30 mm position.", "The wide 30×72×27 mm envelope is not interchangeable with a single-row 6206 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Mount by heating the inner ring (max 120 °C) — driving 4306-ATN9 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 4306-ATN9?", "a": "Double-row 4306 ATN9 measures 30×72×27 mm (1.181×2.835×1.063 in), about 500 g." }, { "q": "What does ATN9 mean on 4306 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (41 kN for 4306-ATN9), reversing axial capacity and some moment stiffness in one 27 mm-wide unit — useful on gearbox layshafts and pump shafts." }, { "q": "Is 4306-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 30×72×27 mm is its own envelope." } ], "cross_ref": [ { "equiv_sku": "62306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×72×27 mm envelope as SKF 62306-2RS1, but catalogue C/C0 differ (41/30 kN vs 28.1/16 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4306-ATN9", "4306 ATN9" ], "locale_variants": {} }, { "sku": "4207-ATN9", "brand": "SKF", "manufacturer_designation": "4207 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 35.1, "static_load_kN": 28.5, "fatigue_load_limit_kN": 1.2, "reference_speed_rpm": 15000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4207 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4207 carries code 07 = 35 mm (code × 5). Two complete ball sets share the 35×72×23 mm (1.378×2.835×0.906 in) envelope, giving C 35.1 kN, C0 28.5 kN and Pu 1.2 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 8000 r/min, mass 400 g. The arrangement is open and requires external sealing.", "applications": [ "machine tool feed drives", "lifting and hoisting gear", "fans with axial thrust reversals", "industrial wheel arrangements" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Double-row 4207 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 35.1 kN in a 23 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4207-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 35 mm position.", "C 35.1 kN in a 23 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Clearance suffixes follow the seal code in the designation stack (e.g. 4207-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 4207-ATN9?", "a": "Double-row 4207 ATN9 measures 35×72×23 mm (1.378×2.835×0.906 in), about 400 g." }, { "q": "What does ATN9 mean on 4207 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "What load does 4207-ATN9 carry?", "a": "C 35.1 kN, C0 28.5 kN and Pu 1.2 kN per catalogue 17000; both rows share the load when the rings sit parallel." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (35.1 kN for 4207-ATN9), reversing axial capacity and some moment stiffness in one 23 mm-wide unit — useful on gearbox layshafts and pump shafts." } ], "cross_ref": [ { "equiv_sku": "62207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×72×23 mm envelope as SKF 62207-2RS1, but catalogue C/C0 differ (35.1/28.5 kN vs 25.5/15.3 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4207-ATN9", "4207 ATN9" ], "locale_variants": {} }, { "sku": "4307-ATN9", "brand": "SKF", "manufacturer_designation": "4307 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 50.7, "static_load_kN": 38, "fatigue_load_limit_kN": 1.63, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 680, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4307 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4307 carries code 07 = 35 mm (code × 5). Two complete ball sets share the 35×80×31 mm (1.378×3.15×1.22 in) envelope, giving C 50.7 kN, C0 38 kN and Pu 1.63 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 7500 r/min, mass 680 g. The arrangement is open and requires external sealing.", "applications": [ "lifting and hoisting gear", "fans with axial thrust reversals", "industrial wheel arrangements", "double-supported pump impeller shafts" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "The wide 35×80×31 mm envelope is not interchangeable with a single-row 6207 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4307 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 50.7 kN in a 31 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4307-ATN9 is sensitive to cocking during pressing.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4307-ATN9 is sensitive to cocking during pressing.", "Catalogue ratings for 4307-ATN9 (C 50.7 kN, C0 38 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 4307-ATN9?", "a": "Double-row 4307 ATN9 measures 35×80×31 mm (1.378×3.15×1.22 in), about 680 g." }, { "q": "What does ATN9 mean on 4307 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "What load does 4307-ATN9 carry?", "a": "C 50.7 kN, C0 38 kN and Pu 1.63 kN per catalogue 17000; both rows share the load when the rings sit parallel." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (50.7 kN for 4307-ATN9), reversing axial capacity and some moment stiffness in one 31 mm-wide unit — useful on gearbox layshafts and pump shafts." } ], "cross_ref": [ { "equiv_sku": "62307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×80×31 mm envelope as SKF 62307-2RS1, but catalogue C/C0 differ (50.7/38 kN vs 33.2/19 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4307-ATN9", "4307 ATN9" ], "locale_variants": {} }, { "sku": "4208-ATN9", "brand": "SKF", "manufacturer_designation": "4208 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 37.1, "static_load_kN": 32.5, "fatigue_load_limit_kN": 1.37, "reference_speed_rpm": 13000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4208 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4208 carries code 08 = 40 mm (code × 5). Two complete ball sets share the 40×80×23 mm (1.575×3.15×0.906 in) envelope, giving C 37.1 kN, C0 32.5 kN and Pu 1.37 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 7000 r/min, mass 500 g. The arrangement is open and requires external sealing.", "applications": [ "belt take-up and tensioner units", "machine tool feed drives", "lifting and hoisting gear", "fans with axial thrust reversals" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "C 37.1 kN in a 23 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4208-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 40 mm position.", "Two deep-groove raceways in 4208-ATN9 share the load but need parallel seats; tilting the 23 mm-wide assembly loads one row heavily and can spall it early.", "Double-row 4208 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "Fillet radii must clear the 4208-ATN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 4208-ATN9?", "a": "Double-row 4208 ATN9 measures 40×80×23 mm (1.575×3.15×0.906 in), about 500 g." }, { "q": "What does ATN9 mean on 4208 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Is 4208-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 40×80×23 mm is its own envelope." }, { "q": "Does 4208-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 7000 r/min; the two cages and wider grease volume generate more drag than a single-row 6208." } ], "cross_ref": [ { "equiv_sku": "62208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×80×23 mm envelope as SKF 62208-2RS1, but catalogue C/C0 differ (37.1/32.5 kN vs 30.7/19 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4208-ATN9", "4208 ATN9" ], "locale_variants": {} }, { "sku": "4308-ATN9", "brand": "SKF", "manufacturer_designation": "4308 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 55.9, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4308 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4308 carries code 08 = 40 mm (code × 5). Two complete ball sets share the 40×90×33 mm (1.575×3.543×1.299 in) envelope, giving C 55.9 kN, C0 45 kN and Pu 1.9 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 6700 r/min, mass 950 g. The arrangement is open and requires external sealing.", "applications": [ "agricultural gearboxes", "belt take-up and tensioner units", "machine tool feed drives", "lifting and hoisting gear" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Double-row 4308 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 55.9 kN in a 33 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4308-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 40 mm position.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 40 mm position.", "Clearance suffixes follow the seal code in the designation stack (e.g. 4308-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 4308-ATN9?", "a": "Double-row 4308 ATN9 measures 40×90×33 mm (1.575×3.543×1.299 in), about 950 g." }, { "q": "What does ATN9 mean on 4308 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Is 4308-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 40×90×33 mm is its own envelope." }, { "q": "Does 4308-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 6700 r/min; the two cages and wider grease volume generate more drag than a single-row 6208." } ], "cross_ref": [ { "equiv_sku": "62308-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×90×33 mm envelope as SKF 62308-2RS1, but catalogue C/C0 differ (55.9/45 kN vs 41/24 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4308-ATN9", "4308 ATN9" ], "locale_variants": {} }, { "sku": "4209-ATN9", "brand": "SKF", "manufacturer_designation": "4209 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 39, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4209 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4209 carries code 09 = 45 mm (code × 5). Two complete ball sets share the 45×85×23 mm (1.772×3.346×0.906 in) envelope, giving C 39 kN, C0 36 kN and Pu 1.53 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 6700 r/min, mass 540 g. The arrangement is open and requires external sealing.", "applications": [ "agricultural gearboxes", "belt take-up and tensioner units", "machine tool feed drives", "lifting and hoisting gear" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Two deep-groove raceways in 4209-ATN9 share the load but need parallel seats; tilting the 23 mm-wide assembly loads one row heavily and can spall it early.", "The wide 45×85×23 mm envelope is not interchangeable with a single-row 6209 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4209 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 39 kN in a 23 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "The wide 45×85×23 mm envelope is not interchangeable with a single-row 6209 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Do not preload 4209-ATN9 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 4209-ATN9?", "a": "Double-row 4209 ATN9 measures 45×85×23 mm (1.772×3.346×0.906 in), about 540 g." }, { "q": "What does ATN9 mean on 4209 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Is 4209-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 45×85×23 mm is its own envelope." }, { "q": "Does 4209-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 6700 r/min; the two cages and wider grease volume generate more drag than a single-row 6209." } ], "cross_ref": [ { "equiv_sku": "62209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×85×23 mm envelope as SKF 62209-2RS1, but catalogue C/C0 differ (39/36 kN vs 33.2/21.6 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4209-ATN9", "4209 ATN9" ], "locale_variants": {} }, { "sku": "4309-ATN9", "brand": "SKF", "manufacturer_designation": "4309 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 68.9, "static_load_kN": 56, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 1250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4309 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4309 carries code 09 = 45 mm (code × 5). Two complete ball sets share the 45×100×36 mm (1.772×3.937×1.417 in) envelope, giving C 68.9 kN, C0 56 kN and Pu 2.4 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 6000 r/min, mass 1250 g. The arrangement is open and requires external sealing.", "applications": [ "belt take-up and tensioner units", "machine tool feed drives", "lifting and hoisting gear", "fans with axial thrust reversals" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "The wide 45×100×36 mm envelope is not interchangeable with a single-row 6209 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4309 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 68.9 kN in a 36 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4309-ATN9 is sensitive to cocking during pressing.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4309-ATN9 is sensitive to cocking during pressing.", "Do not preload 4309-ATN9 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of 4309-ATN9?", "a": "Double-row 4309 ATN9 measures 45×100×36 mm (1.772×3.937×1.417 in), about 1250 g." }, { "q": "What does ATN9 mean on 4309 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Does 4309-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 6000 r/min; the two cages and wider grease volume generate more drag than a single-row 6209." }, { "q": "How is 4309-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." } ], "cross_ref": [ { "equiv_sku": "62309-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×100×36 mm envelope as SKF 62309-2RS1, but catalogue C/C0 differ (68.9/56 kN vs 52.7/31.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4309-ATN9", "4309 ATN9" ], "locale_variants": {} }, { "sku": "4210-ATN9", "brand": "SKF", "manufacturer_designation": "4210 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 41, "static_load_kN": 40, "fatigue_load_limit_kN": 1.7, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4210 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4210 carries code 10 = 50 mm (code × 5). Two complete ball sets share the 50×90×23 mm (1.969×3.543×0.906 in) envelope, giving C 41 kN, C0 40 kN and Pu 1.7 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 6000 r/min, mass 580 g. The arrangement is open and requires external sealing.", "applications": [ "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load", "agricultural gearboxes", "belt take-up and tensioner units" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Two deep-groove raceways in 4210-ATN9 share the load but need parallel seats; tilting the 23 mm-wide assembly loads one row heavily and can spall it early.", "The wide 50×90×23 mm envelope is not interchangeable with a single-row 6210 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4210 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 41 kN in a 23 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "C 41 kN in a 23 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "The fatigue load limit is 1.7 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other." ], "faq": [ { "q": "What are the dimensions of 4210-ATN9?", "a": "Double-row 4210 ATN9 measures 50×90×23 mm (1.969×3.543×0.906 in), about 580 g." }, { "q": "What does ATN9 mean on 4210 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (41 kN for 4210-ATN9), reversing axial capacity and some moment stiffness in one 23 mm-wide unit — useful on gearbox layshafts and pump shafts." }, { "q": "Is 4210-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 50×90×23 mm is its own envelope." } ], "cross_ref": [ { "equiv_sku": "62210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×90×23 mm envelope as SKF 62210-2RS1, but catalogue C/C0 differ (41/40 kN vs 35.1/23.2 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4210-ATN9", "4210 ATN9" ], "locale_variants": {} }, { "sku": "4310-ATN9", "brand": "SKF", "manufacturer_designation": "4310 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 81.9, "static_load_kN": 69.5, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 1700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4310 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4310 carries code 10 = 50 mm (code × 5). Two complete ball sets share the 50×110×40 mm (1.969×4.331×1.575 in) envelope, giving C 81.9 kN, C0 69.5 kN and Pu 2.9 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 5300 r/min, mass 1700 g. The arrangement is open and requires external sealing.", "applications": [ "lifting and hoisting gear", "fans with axial thrust reversals", "industrial wheel arrangements", "double-supported pump impeller shafts" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "The wide 50×110×40 mm envelope is not interchangeable with a single-row 6210 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4310 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 81.9 kN in a 40 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4310-ATN9 is sensitive to cocking during pressing.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4310-ATN9 is sensitive to cocking during pressing.", "Assign interference to the rotating ring: on a conventional shaft-mounted 50 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates." ], "faq": [ { "q": "What are the dimensions of 4310-ATN9?", "a": "Double-row 4310 ATN9 measures 50×110×40 mm (1.969×4.331×1.575 in), about 1700 g." }, { "q": "What does ATN9 mean on 4310 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Is 4310-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 50×110×40 mm is its own envelope." }, { "q": "Does 4310-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 5300 r/min; the two cages and wider grease volume generate more drag than a single-row 6210." } ], "cross_ref": [ { "equiv_sku": "62310-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×110×40 mm envelope as SKF 62310-2RS1, but catalogue C/C0 differ (81.9/69.5 kN vs 61.8/38 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4310-ATN9", "4310 ATN9" ], "locale_variants": {} }, { "sku": "4211-ATN9", "brand": "SKF", "manufacturer_designation": "4211 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 44.9, "static_load_kN": 44, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4211 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4211 carries code 11 = 55 mm (code × 5). Two complete ball sets share the 55×100×25 mm (2.165×3.937×0.984 in) envelope, giving C 44.9 kN, C0 44 kN and Pu 1.9 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 5600 r/min, mass 800 g. The arrangement is open and requires external sealing.", "applications": [ "gearbox layshafts with reversing axial load", "agricultural gearboxes", "belt take-up and tensioner units", "machine tool feed drives" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The wide 55×100×25 mm envelope is not interchangeable with a single-row 6211 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4211 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 44.9 kN in a 25 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4211-ATN9 is sensitive to cocking during pressing.", "Double-row 4211 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "Fillet radii must clear the 4211-ATN9 chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 4211-ATN9?", "a": "Double-row 4211 ATN9 measures 55×100×25 mm (2.165×3.937×0.984 in), about 800 g." }, { "q": "What does ATN9 mean on 4211 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Does 4211-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 5600 r/min; the two cages and wider grease volume generate more drag than a single-row 6211." }, { "q": "How is 4211-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." } ], "cross_ref": [ { "equiv_sku": "62211-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×100×25 mm envelope as SKF 62211-2RS1, but catalogue C/C0 differ (44.9/44 kN vs 43.6/29 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4211-ATN9", "4211 ATN9" ], "locale_variants": {} }, { "sku": "4311-ATN9", "brand": "SKF", "manufacturer_designation": "4311 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 97.5, "static_load_kN": 83, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4311 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4311 carries code 11 = 55 mm (code × 5). Two complete ball sets share the 55×120×43 mm (2.165×4.724×1.693 in) envelope, giving C 97.5 kN, C0 83 kN and Pu 3.45 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 5000 r/min, mass 2150 g. The arrangement is open and requires external sealing.", "applications": [ "machine tool feed drives", "lifting and hoisting gear", "fans with axial thrust reversals", "industrial wheel arrangements" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Two deep-groove raceways in 4311-ATN9 share the load but need parallel seats; tilting the 43 mm-wide assembly loads one row heavily and can spall it early.", "The wide 55×120×43 mm envelope is not interchangeable with a single-row 6211 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4311 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 97.5 kN in a 43 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 55 mm position.", "At 55 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 4311-ATN9?", "a": "Double-row 4311 ATN9 measures 55×120×43 mm (2.165×4.724×1.693 in), about 2150 g." }, { "q": "What does ATN9 mean on 4311 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Is 4311-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 55×120×43 mm is its own envelope." }, { "q": "Does 4311-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 5000 r/min; the two cages and wider grease volume generate more drag than a single-row 6211." } ], "cross_ref": [ { "equiv_sku": "62311-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×120×43 mm envelope as SKF 62311-2RS1, but catalogue C/C0 differ (97.5/83 kN vs 71.5/45 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4311-ATN9", "4311 ATN9" ], "locale_variants": {} }, { "sku": "4212-ATN9", "brand": "SKF", "manufacturer_designation": "4212 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 57.2, "static_load_kN": 55, "fatigue_load_limit_kN": 2.36, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4212 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4212 carries code 12 = 60 mm (code × 5). Two complete ball sets share the 60×110×28 mm (2.362×4.331×1.102 in) envelope, giving C 57.2 kN, C0 55 kN and Pu 2.36 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 5300 r/min, mass 1100 g. The arrangement is open and requires external sealing.", "applications": [ "agricultural gearboxes", "belt take-up and tensioner units", "machine tool feed drives", "lifting and hoisting gear" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4212-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 60 mm position.", "Two deep-groove raceways in 4212-ATN9 share the load but need parallel seats; tilting the 28 mm-wide assembly loads one row heavily and can spall it early.", "The wide 60×110×28 mm envelope is not interchangeable with a single-row 6212 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "The wide 60×110×28 mm envelope is not interchangeable with a single-row 6212 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Clearance suffixes follow the seal code in the designation stack (e.g. 4212-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 4212-ATN9?", "a": "Double-row 4212 ATN9 measures 60×110×28 mm (2.362×4.331×1.102 in), about 1100 g." }, { "q": "What does ATN9 mean on 4212 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "What load does 4212-ATN9 carry?", "a": "C 57.2 kN, C0 55 kN and Pu 2.36 kN per catalogue 17000; both rows share the load when the rings sit parallel." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (57.2 kN for 4212-ATN9), reversing axial capacity and some moment stiffness in one 28 mm-wide unit — useful on gearbox layshafts and pump shafts." } ], "cross_ref": [ { "equiv_sku": "62212-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×110×28 mm envelope as SKF 62212-2RS1, but catalogue C/C0 differ (57.2/55 kN vs 52.7/36 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4212-ATN9", "4212 ATN9" ], "locale_variants": {} }, { "sku": "4312-ATN9", "brand": "SKF", "manufacturer_designation": "4312 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 112, "static_load_kN": 98, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4312 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4312 carries code 12 = 60 mm (code × 5). Two complete ball sets share the 60×130×46 mm (2.362×5.118×1.811 in) envelope, giving C 112 kN, C0 98 kN and Pu 4.15 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 4500 r/min, mass 2650 g. The arrangement is open and requires external sealing.", "applications": [ "industrial wheel arrangements", "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load", "agricultural gearboxes" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "C 112 kN in a 46 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4312-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 60 mm position.", "Two deep-groove raceways in 4312-ATN9 share the load but need parallel seats; tilting the 46 mm-wide assembly loads one row heavily and can spall it early.", "Two deep-groove raceways in 4312-ATN9 share the load but need parallel seats; tilting the 46 mm-wide assembly loads one row heavily and can spall it early.", "Catalogue ratings for 4312-ATN9 (C 112 kN, C0 98 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 4312-ATN9?", "a": "Double-row 4312 ATN9 measures 60×130×46 mm (2.362×5.118×1.811 in), about 2650 g." }, { "q": "What does ATN9 mean on 4312 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (112 kN for 4312-ATN9), reversing axial capacity and some moment stiffness in one 46 mm-wide unit — useful on gearbox layshafts and pump shafts." }, { "q": "Is 4312-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 60×130×46 mm is its own envelope." } ], "cross_ref": [ { "equiv_sku": "62312-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×130×46 mm envelope as SKF 62312-2RS1, but catalogue C/C0 differ (112/98 kN vs 81.9/52 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4312-ATN9", "4312 ATN9" ], "locale_variants": {} }, { "sku": "4213-ATN9", "brand": "SKF", "manufacturer_designation": "4213 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 67.6, "static_load_kN": 67, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4213 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4213 carries code 13 = 65 mm (code × 5). Two complete ball sets share the 65×120×31 mm (2.559×4.724×1.22 in) envelope, giving C 67.6 kN, C0 67 kN and Pu 2.8 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 4800 r/min, mass 1450 g. The arrangement is open and requires external sealing.", "applications": [ "belt take-up and tensioner units", "machine tool feed drives", "lifting and hoisting gear", "fans with axial thrust reversals" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "C 67.6 kN in a 31 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4213-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 65 mm position.", "Two deep-groove raceways in 4213-ATN9 share the load but need parallel seats; tilting the 31 mm-wide assembly loads one row heavily and can spall it early.", "Two deep-groove raceways in 4213-ATN9 share the load but need parallel seats; tilting the 31 mm-wide assembly loads one row heavily and can spall it early.", "Fillet radii must clear the 4213-ATN9 chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face." ], "faq": [ { "q": "What are the dimensions of 4213-ATN9?", "a": "Double-row 4213 ATN9 measures 65×120×31 mm (2.559×4.724×1.22 in), about 1450 g." }, { "q": "What does ATN9 mean on 4213 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "What load does 4213-ATN9 carry?", "a": "C 67.6 kN, C0 67 kN and Pu 2.8 kN per catalogue 17000; both rows share the load when the rings sit parallel." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (67.6 kN for 4213-ATN9), reversing axial capacity and some moment stiffness in one 31 mm-wide unit — useful on gearbox layshafts and pump shafts." } ], "cross_ref": [ { "equiv_sku": "62213-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×31 mm envelope as SKF 62213-2RS1, but catalogue C/C0 differ (67.6/67 kN vs 55.9/40.5 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4213-ATN9", "4213 ATN9" ], "locale_variants": {} }, { "sku": "4313-ATN9", "brand": "SKF", "manufacturer_designation": "4313 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 121, "static_load_kN": 106, "fatigue_load_limit_kN": 4.5, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4313 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4313 carries code 13 = 65 mm (code × 5). Two complete ball sets share the 65×140×48 mm (2.559×5.512×1.89 in) envelope, giving C 121 kN, C0 106 kN and Pu 4.5 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 4300 r/min, mass 3250 g. The arrangement is open and requires external sealing.", "applications": [ "fans with axial thrust reversals", "industrial wheel arrangements", "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Two deep-groove raceways in 4313-ATN9 share the load but need parallel seats; tilting the 48 mm-wide assembly loads one row heavily and can spall it early.", "The wide 65×140×48 mm envelope is not interchangeable with a single-row 6213 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4313 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 121 kN in a 48 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "C 121 kN in a 48 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Deep-groove geometry tolerates only minutes of misalignment; if the 140 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 4313-ATN9." ], "faq": [ { "q": "What are the dimensions of 4313-ATN9?", "a": "Double-row 4313 ATN9 measures 65×140×48 mm (2.559×5.512×1.89 in), about 3250 g." }, { "q": "What does ATN9 mean on 4313 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "What load does 4313-ATN9 carry?", "a": "C 121 kN, C0 106 kN and Pu 4.5 kN per catalogue 17000; both rows share the load when the rings sit parallel." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (121 kN for 4313-ATN9), reversing axial capacity and some moment stiffness in one 48 mm-wide unit — useful on gearbox layshafts and pump shafts." } ], "cross_ref": [ { "equiv_sku": "62313-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×140×48 mm envelope as SKF 62313-2RS1, but catalogue C/C0 differ (121/106 kN vs 92.3/60 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4313-ATN9", "4313 ATN9" ], "locale_variants": {} }, { "sku": "4214-ATN9", "brand": "SKF", "manufacturer_designation": "4214 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 70.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 3.1, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4214 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4214 carries code 14 = 70 mm (code × 5). Two complete ball sets share the 70×125×31 mm (2.756×4.921×1.22 in) envelope, giving C 70.2 kN, C0 73.5 kN and Pu 3.1 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 4300 r/min, mass 1500 g. The arrangement is open and requires external sealing.", "applications": [ "machine tool feed drives", "lifting and hoisting gear", "fans with axial thrust reversals", "industrial wheel arrangements" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Two deep-groove raceways in 4214-ATN9 share the load but need parallel seats; tilting the 31 mm-wide assembly loads one row heavily and can spall it early.", "The wide 70×125×31 mm envelope is not interchangeable with a single-row 6214 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4214 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 70.2 kN in a 31 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "C 70.2 kN in a 31 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Mount by heating the inner ring (max 120 °C) — driving 4214-ATN9 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of 4214-ATN9?", "a": "Double-row 4214 ATN9 measures 70×125×31 mm (2.756×4.921×1.22 in), about 1500 g." }, { "q": "What does ATN9 mean on 4214 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "How is 4214-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." }, { "q": "What load does 4214-ATN9 carry?", "a": "C 70.2 kN, C0 73.5 kN and Pu 3.1 kN per catalogue 17000; both rows share the load when the rings sit parallel." } ], "cross_ref": [ { "equiv_sku": "62214-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×31 mm envelope as SKF 62214-2RS1, but catalogue C/C0 differ (70.2/73.5 kN vs 60.5/45 kN) — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4214-ATN9", "4214 ATN9" ], "locale_variants": {} }, { "sku": "4215-ATN9", "brand": "SKF", "manufacturer_designation": "4215 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 72.8, "static_load_kN": 80, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4215 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4215 carries code 15 = 75 mm (code × 5). Two complete ball sets share the 75×130×31 mm (2.953×5.118×1.22 in) envelope, giving C 72.8 kN, C0 80 kN and Pu 3.35 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 4000 r/min, mass 1600 g. The arrangement is open and requires external sealing.", "applications": [ "lifting and hoisting gear", "fans with axial thrust reversals", "industrial wheel arrangements", "double-supported pump impeller shafts" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "The wide 75×130×31 mm envelope is not interchangeable with a single-row 6215 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4215 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 72.8 kN in a 31 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4215-ATN9 is sensitive to cocking during pressing.", "Double-row 4215 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "Catalogue ratings for 4215-ATN9 (C 72.8 kN, C0 80 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification." ], "faq": [ { "q": "What are the dimensions of 4215-ATN9?", "a": "Double-row 4215 ATN9 measures 75×130×31 mm (2.953×5.118×1.22 in), about 1600 g." }, { "q": "What does ATN9 mean on 4215 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Is 4215-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 75×130×31 mm is its own envelope." }, { "q": "Does 4215-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 4000 r/min; the two cages and wider grease volume generate more drag than a single-row 6215." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4215-ATN9", "4215 ATN9" ], "locale_variants": {} }, { "sku": "4315-ATN9", "brand": "SKF", "manufacturer_designation": "4315 ATN9", "series": "4300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 156, "static_load_kN": 143, "fatigue_load_limit_kN": 5.5, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 4800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4315 ATN9 is a double-row deep-groove ball bearing in the 4300-series: the last two digits encode the bore: 4315 carries code 15 = 75 mm (code × 5). Two complete ball sets share the 75×160×55 mm (2.953×6.299×2.165 in) envelope, giving C 156 kN, C0 143 kN and Pu 5.5 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 3600 r/min, mass 4800 g. The arrangement is open and requires external sealing.", "applications": [ "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load", "agricultural gearboxes", "belt take-up and tensioner units" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Two deep-groove raceways in 4315-ATN9 share the load but need parallel seats; tilting the 55 mm-wide assembly loads one row heavily and can spall it early.", "The wide 75×160×55 mm envelope is not interchangeable with a single-row 6215 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4315 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 156 kN in a 55 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 75 mm position.", "At 75 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 4315-ATN9?", "a": "Double-row 4315 ATN9 measures 75×160×55 mm (2.953×6.299×2.165 in), about 4800 g." }, { "q": "What does ATN9 mean on 4315 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (156 kN for 4315-ATN9), reversing axial capacity and some moment stiffness in one 55 mm-wide unit — useful on gearbox layshafts and pump shafts." }, { "q": "Is 4315-ATN9 interchangeable with a 62-series single-row bearing?", "a": "No: although bore matches, OD and width differ and the seat shoulders must suit the wide double-row ring; 75×160×55 mm is its own envelope." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4315-ATN9", "4315 ATN9" ], "locale_variants": {} }, { "sku": "4216-ATN9", "brand": "SKF", "manufacturer_designation": "4216 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 80.6, "static_load_kN": 90, "fatigue_load_limit_kN": 3.6, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4216 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4216 carries code 16 = 80 mm (code × 5). Two complete ball sets share the 80×140×33 mm (3.15×5.512×1.299 in) envelope, giving C 80.6 kN, C0 90 kN and Pu 3.6 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 3800 r/min, mass 2000 g. The arrangement is open and requires external sealing.", "applications": [ "fans with axial thrust reversals", "industrial wheel arrangements", "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Two deep-groove raceways in 4216-ATN9 share the load but need parallel seats; tilting the 33 mm-wide assembly loads one row heavily and can spall it early.", "The wide 80×140×33 mm envelope is not interchangeable with a single-row 6216 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Double-row 4216 is open and needs application sealing and lubrication; in dusty drives add external seals rather than expecting the bearing itself to stay clean.", "C 80.6 kN in a 33 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "The wide 80×140×33 mm envelope is not interchangeable with a single-row 6216 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "Clearance suffixes follow the seal code in the designation stack (e.g. 4216-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of 4216-ATN9?", "a": "Double-row 4216 ATN9 measures 80×140×33 mm (3.15×5.512×1.299 in), about 2000 g." }, { "q": "What does ATN9 mean on 4216 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "What load does 4216-ATN9 carry?", "a": "C 80.6 kN, C0 90 kN and Pu 3.6 kN per catalogue 17000; both rows share the load when the rings sit parallel." }, { "q": "Why choose a double-row 42xx/43xx bearing?", "a": "Two ball rows give higher C (80.6 kN for 4216-ATN9), reversing axial capacity and some moment stiffness in one 33 mm-wide unit — useful on gearbox layshafts and pump shafts." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4216-ATN9", "4216 ATN9" ], "locale_variants": {} }, { "sku": "4217-ATN9", "brand": "SKF", "manufacturer_designation": "4217 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 93.6, "static_load_kN": 102, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 2550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4217 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4217 carries code 17 = 85 mm (code × 5). Two complete ball sets share the 85×150×36 mm (3.346×5.906×1.417 in) envelope, giving C 93.6 kN, C0 102 kN and Pu 4 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 3600 r/min, mass 2550 g. The arrangement is open and requires external sealing.", "applications": [ "industrial wheel arrangements", "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load", "agricultural gearboxes" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "C 93.6 kN in a 36 mm width is the strength of the double-row design; use it for combined or reversing axial loads rather than pure radial duty where a slimmer single-row bearing would run cooler.", "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4217-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 85 mm position.", "Two deep-groove raceways in 4217-ATN9 share the load but need parallel seats; tilting the 36 mm-wide assembly loads one row heavily and can spall it early.", "Two deep-groove raceways in 4217-ATN9 share the load but need parallel seats; tilting the 36 mm-wide assembly loads one row heavily and can spall it early.", "Deep-groove geometry tolerates only minutes of misalignment; if the 150 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 4217-ATN9." ], "faq": [ { "q": "What are the dimensions of 4217-ATN9?", "a": "Double-row 4217 ATN9 measures 85×150×36 mm (3.346×5.906×1.417 in), about 2550 g." }, { "q": "What does ATN9 mean on 4217 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "How is 4217-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." }, { "q": "What load does 4217-ATN9 carry?", "a": "C 93.6 kN, C0 102 kN and Pu 4 kN per catalogue 17000; both rows share the load when the rings sit parallel." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4217-ATN9", "4217 ATN9" ], "locale_variants": {} }, { "sku": "4218-ATN9", "brand": "SKF", "manufacturer_designation": "4218 ATN9", "series": "4200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 112, "static_load_kN": 122, "fatigue_load_limit_kN": 4.65, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "4218 ATN9 is a double-row deep-groove ball bearing in the 4200-series: the last two digits encode the bore: 4218 carries code 18 = 90 mm (code × 5). Two complete ball sets share the 90×160×40 mm (3.543×6.299×1.575 in) envelope, giving C 112 kN, C0 122 kN and Pu 4.65 kN, with reversing axial capacity a single-row bearing cannot match. ATN9 is the glass-fibre PA66 cage. Limiting speed 3400 r/min, mass 3200 g. The arrangement is open and requires external sealing.", "applications": [ "double-supported pump impeller shafts", "gearbox layshafts with reversing axial load", "agricultural gearboxes", "belt take-up and tensioner units" ], "failure_modes": [ "uneven load sharing between the two raceways when one ring is tilted", "polyamide cage embrittlement after sustained high-temperature service", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Fit both rings square on the shoulders: the narrow internal land between the two raceways of 4218-ATN9 is sensitive to cocking during pressing.", "The ATN9 cage is glass-fibre-reinforced polyamide 66: it is light and quiet but caps continuous service around 100–120 °C in oil/grease — above that use the pressed-steel or machined-cage version of the 90 mm position.", "Two deep-groove raceways in 4218-ATN9 share the load but need parallel seats; tilting the 40 mm-wide assembly loads one row heavily and can spall it early.", "The wide 90×160×40 mm envelope is not interchangeable with a single-row 6218 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "The wide 90×160×40 mm envelope is not interchangeable with a single-row 6218 — the housing and shaft shoulders differ, so design the seat for the double-row width from the start.", "At 90 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast." ], "faq": [ { "q": "What are the dimensions of 4218-ATN9?", "a": "Double-row 4218 ATN9 measures 90×160×40 mm (3.543×6.299×1.575 in), about 3200 g." }, { "q": "What does ATN9 mean on 4218 ATN9?", "a": "A = double-row deep-groove arrangement, TN9 is a glass-fibre-reinforced polyamide 66 cage; it limits continuous temperature to roughly 100–120 °C." }, { "q": "Does 4218-ATN9 run as fast as a single-row bearing?", "a": "Somewhat slower: SKF rates it to 3400 r/min; the two cages and wider grease volume generate more drag than a single-row 6218." }, { "q": "How is 4218-ATN9 lubricated and sealed?", "a": "The ATN9 execution is open and greased/oiled by the application; provide external lip seals and a regreasing path for dirty duty." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-27", "last_verified": "2026-09-27", "confidence_score": 0.7, "status": "published", "aliases": [ "4218-ATN9", "4218 ATN9" ], "locale_variants": {} }, { "sku": "23014", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 779, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23014 encode the bore: code 14 = 70 mm (code × 5 from 04 upward). The ISO 15 envelope is 110 mm outside diameter and 27 mm width — 2.756 × 4.331 × 1.063 in, with a 20.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "On this 70 mm-bore 23014, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 70 mm shaft.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (110 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 20.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Thermal soak matters on this 70 mm-bore row: a 110 mm housing heating faster than the shaft closes the 20.0 mm section's internal clearance, so a mount that ran quiet cold can seize hot — start from C3/C4 and verify the operating-temperature play before signing off the 27 mm assembly.", "Check the shoulder geometry for 23014: a generous fillet on the 70 mm shaft looks strong but stops the 27 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 20.0 mm-section outer ring presses flush in the 110 mm housing.", "Large 23014 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 27 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23014, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 70 mm journal must be replaced, or the new bearing frets the same seat.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 23014 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 23014 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 23014 spherical roller bearing?", "a": "A 23014 double-row spherical roller bearing per ISO 15 has a 70 mm bore, 110 mm outer diameter and 27 mm width (2.756 × 4.331 × 1.063 in), a 20.0 mm radial section and roughly 779 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23014 bore code work?", "a": "The leading 2 in 23014 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 14: 14 × 5 = 70 mm. The 110 mm OD and 27 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23014 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23014 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23014 and 23014K?", "a": "The plain 23014 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23014 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "23014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23014K", "23014-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23015", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 30, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 914, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23015 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 15 envelope is 115 mm outside diameter and 30 mm width — 2.953 × 4.528 × 1.181 in, with a 20.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines" ], "failure_modes": [ "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime" ], "pitfalls": [ "On this 75 mm-bore 23015, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 75 mm shaft.", "The 230 series (ISO 15 dimension series 30) pairs a wide 30 mm section with a compact 115 mm OD at 75 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.", "Housing stiffness governs the 23015: with the load carried on a 115 mm OD but only a 20.0 mm radial section feeding it, a soft or ribbed thin housing lets the outer ring flex and the sphered raceway misreads it as misalignment — support the housing boss fully around the 30 mm width.", "The 30 mm-wide 23015 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 115 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 20.0 mm section.", "For a cylindrical-bore 23015, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 75 mm shaft; cooling creates the interference, while hammering cold through the 115 mm assembly dents the sphered raceways.", "Relubricate 23015 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 30 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 75 mm bore starved.", "Choose the bore type deliberately: plain 23015 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 75 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class." ], "faq": [ { "q": "What are the dimensions of a 23015 spherical roller bearing?", "a": "A 23015 double-row spherical roller bearing per ISO 15 has a 75 mm bore, 115 mm outer diameter and 30 mm width (2.953 × 4.528 × 1.181 in), a 20.0 mm radial section and roughly 914 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23015 bore code work?", "a": "The leading 2 in 23015 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 15: 15 × 5 = 75 mm. The 115 mm OD and 30 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23015 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23015 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23015 and 23015K?", "a": "The plain 23015 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23015 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "23015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23015K", "23015-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23016", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 35, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1294, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23016 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 15 envelope is 125 mm outside diameter and 35 mm width — 3.15 × 4.921 × 1.378 in, with a 22.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 80 mm-bore 23016 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 35 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 80 mm bore the 23016 gives a 125×35 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Drive-up a sleeve-mounted 23016 on residual clearance, not feel: the 80 mm K taper pulls the wide 35 mm inner ring up quickly, and every 0.01 mm of radial clearance removed is real preload on a 22.5 mm section — measure with feeler gauges at the unloaded roller row before locking the KM nut.", "Before fitting 23016, machine the 80 mm shaft seat and 125 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 35 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 22.5 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23016 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 80 mm seat cannot creep.", "Read the damage pattern on a removed 23016: spalling concentrated on one side of the 125 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 80 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 35 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 23016 spherical roller bearing?", "a": "A 23016 double-row spherical roller bearing per ISO 15 has a 80 mm bore, 125 mm outer diameter and 35 mm width (3.15 × 4.921 × 1.378 in), a 22.5 mm radial section and roughly 1294 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23016 bore code work?", "a": "The leading 2 in 23016 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 16: 16 × 5 = 80 mm. The 125 mm OD and 35 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23016 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23016 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23016 and 23016K?", "a": "The plain 23016 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23016 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "23016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23016K", "23016-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23017", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 36, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1396, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23017 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 15 envelope is 130 mm outside diameter and 36 mm width — 3.346 × 5.118 × 1.417 in, with a 22.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions" ], "failure_modes": [ "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely" ], "pitfalls": [ "The large 85 mm-bore 23017 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 36 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (130 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 22.5 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Grease life on the 23017 is set by the slow, dirty regime it usually works in: relubricate through the W33 groove until old grease flushes clear of the full 36 mm-wide double row, because the 22.5 mm section gives contamination little room to fall away from the 130 mm raceway on its own.", "Check the shoulder geometry for 23017: a generous fillet on the 85 mm shaft looks strong but stops the 36 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 22.5 mm-section outer ring presses flush in the 130 mm housing.", "Large 23017 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 36 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23017, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 85 mm journal must be replaced, or the new bearing frets the same seat.", "Specify W33 when the 36 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.", "Press 23017 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 130 mm assembly." ], "faq": [ { "q": "What are the dimensions of a 23017 spherical roller bearing?", "a": "A 23017 double-row spherical roller bearing per ISO 15 has a 85 mm bore, 130 mm outer diameter and 36 mm width (3.346 × 5.118 × 1.417 in), a 22.5 mm radial section and roughly 1396 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23017 bore code work?", "a": "The leading 2 in 23017 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 17: 17 × 5 = 85 mm. The 130 mm OD and 36 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23017 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23017 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23017 and 23017K?", "a": "The plain 23017 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23017 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "23017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23017K", "23017-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23018", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 37, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1705, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23018 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 15 envelope is 140 mm outside diameter and 37 mm width — 3.543 × 5.512 × 1.457 in, with a 25.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "The large 90 mm-bore 23018 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 37 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series (ISO 15 dimension series 30) pairs a wide 37 mm section with a compact 140 mm OD at 90 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.", "Check shaft deflection across the 23018 span: the wide 37 mm section tolerates some misalignment through the sphered raceway, but a bent shaft between two 230-series rows alternates the load path every revolution and frets both 90 mm seats — align to the catalogue angular limit under load, not at standstill.", "The 37 mm-wide 23018 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 140 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 25.0 mm section.", "For a cylindrical-bore 23018, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 90 mm shaft; cooling creates the interference, while hammering cold through the 140 mm assembly dents the sphered raceways.", "Relubricate 23018 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 37 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 90 mm bore starved.", "Press 23018 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 140 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 23018 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 23018 spherical roller bearing?", "a": "A 23018 double-row spherical roller bearing per ISO 15 has a 90 mm bore, 140 mm outer diameter and 37 mm width (3.543 × 5.512 × 1.457 in), a 25.0 mm radial section and roughly 1705 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23018 bore code work?", "a": "The leading 2 in 23018 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 18: 18 × 5 = 90 mm. The 140 mm OD and 37 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23018 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23018 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23018 and 23018K?", "a": "The plain 23018 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23018 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "23018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23018K", "23018-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23019", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 35, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1683, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23019 encode the bore: code 19 = 95 mm (code × 5 from 04 upward). The ISO 15 envelope is 145 mm outside diameter and 35 mm width — 3.74 × 5.709 × 1.378 in, with a 25.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery" ], "failure_modes": [ "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty" ], "pitfalls": [ "The large 95 mm-bore 23019 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 35 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 95 mm bore the 23019 gives a 145×35 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Thermal soak matters on this 95 mm-bore row: a 145 mm housing heating faster than the shaft closes the 25.0 mm section's internal clearance, so a mount that ran quiet cold can seize hot — start from C3/C4 and verify the operating-temperature play before signing off the 35 mm assembly.", "Before fitting 23019, machine the 95 mm shaft seat and 145 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 35 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 25.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23019 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 95 mm seat cannot creep.", "Read the damage pattern on a removed 23019: spalling concentrated on one side of the 145 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 23019 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.", "In a classic two-bearing arrangement the 23019 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row." ], "faq": [ { "q": "What are the dimensions of a 23019 spherical roller bearing?", "a": "A 23019 double-row spherical roller bearing per ISO 15 has a 95 mm bore, 145 mm outer diameter and 35 mm width (3.74 × 5.709 × 1.378 in), a 25.0 mm radial section and roughly 1683 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23019 bore code work?", "a": "The leading 2 in 23019 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 19: 19 × 5 = 95 mm. The 145 mm OD and 35 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23019 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23019 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23019 and 23019K?", "a": "The plain 23019 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23019 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "23019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23019K", "23019-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23020", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 37, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1853, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23020 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 15 envelope is 150 mm outside diameter and 37 mm width — 3.937 × 5.906 × 1.457 in, with a 25.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "The large 100 mm-bore 23020 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 37 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (150 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 25.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Housing stiffness governs the 23020: with the load carried on a 150 mm OD but only a 25.0 mm radial section feeding it, a soft or ribbed thin housing lets the outer ring flex and the sphered raceway misreads it as misalignment — support the housing boss fully around the 37 mm width.", "Check the shoulder geometry for 23020: a generous fillet on the 100 mm shaft looks strong but stops the 37 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 25.0 mm-section outer ring presses flush in the 150 mm housing.", "Large 23020 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 37 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23020, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 100 mm journal must be replaced, or the new bearing frets the same seat.", "In a classic two-bearing arrangement the 23020 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 23020 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 23020 spherical roller bearing?", "a": "A 23020 double-row spherical roller bearing per ISO 15 has a 100 mm bore, 150 mm outer diameter and 37 mm width (3.937 × 5.906 × 1.457 in), a 25.0 mm radial section and roughly 1853 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23020 bore code work?", "a": "The leading 2 in 23020 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 20: 20 × 5 = 100 mm. The 150 mm OD and 37 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23020 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23020 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23020 and 23020K?", "a": "The plain 23020 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23020 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "23020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23020K", "23020-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 } ]