[ { "sku": "6316-M", "brand": "SKF", "manufacturer_designation": "6316 M", "series": "6300-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": "brass", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 8500, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 4400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6316 carries code 16 = 80 mm (code × 5). The envelope is 80×170×39 mm (3.15×6.693×1.535 in) with a 45.0 mm radial section height, C 130 kN, C0 86.5 kN and Pu 3.25 kN. The open 6316 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7500 r/min, catalogue mass 4400 g.", "applications": [ "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Catalogue ratings for 6316-M (C 130 kN, C0 86.5 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.", "The fatigue load limit is 3.25 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The M suffix on 6316-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 4400 g quoted mass includes the heavier cage.", "Open 6316-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6316-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 6316-M home through the outer ring or balls brinells the raceways.", "A replacement 6316 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6316-M?", "a": "The SKF 6316 M measures 80 mm bore × 170 mm OD × 39 mm width (3.15 × 6.693 × 1.535 in), mass about 4400 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6316 work?", "a": "The final two digits of 6316 are bore code 16, multiplied by 5 to give 80 mm." }, { "q": "What is the speed rating of 6316-M?", "a": "SKF lists a 8500 r/min thermal reference speed and a 7500 r/min mechanical limiting speed for 6316 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6316-M and a same-bore 62-series bearing?", "a": "Section height differs: 6316-M has a 45 mm radial section and C 130 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6316-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 170 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope as SKF 316, but catalogue C/C0 differ (130/86.5 kN vs 138/129 kN) — envelope match only after a load check." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope as SKF 316-2Z, but catalogue C/C0 differ (130/86.5 kN vs 138/129 kN) — envelope match only after a load check." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6316 (open arrangement) shares the 80×170×39 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6316-2Z (two non-contact shields) shares the 80×170×39 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6316-2RS1 (two contact elastomer seals) shares the 80×170×39 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6316DDU on the same 80×170×39 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6316VV on the same 80×170×39 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6316ZZ on the same 80×170×39 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6316 on the same 80×170×39 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6316-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6316 on the same 80×170×39 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6316-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6316LLU on the same 80×170×39 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6316-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6316LLB on the same 80×170×39 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6316-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6316ZZ on the same 80×170×39 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6316-M", "6316 M" ], "locale_variants": {} }, { "sku": "6217-M", "brand": "SKF", "manufacturer_designation": "6217 M", "series": "6200-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": "brass", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 9000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 2000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6217 carries code 17 = 85 mm (code × 5). The envelope is 85×150×28 mm (3.346×5.906×1.102 in) with a 32.5 mm radial section height, C 87.1 kN, C0 64 kN and Pu 2.5 kN. The open 6217 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 8000 r/min, catalogue mass 2000 g.", "applications": [ "industrial fans", "compressor drives", "machine tool auxiliaries", "agricultural gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "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 6217-M.", "Fillet radii must clear the 6217-M chamfer so the 28 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6217-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 2000 g quoted mass includes the heavier cage.", "Open 6217-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6217-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "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 6217-M.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 6217 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6217-M?", "a": "The SKF 6217 M measures 85 mm bore × 150 mm OD × 28 mm width (3.346 × 5.906 × 1.102 in), mass about 2000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6217 work?", "a": "The final two digits of 6217 are bore code 17, multiplied by 5 to give 85 mm." }, { "q": "What load can 6217-M take?", "a": "Catalogue values for 6217 M: dynamic C 87.1 kN, static C0 64 kN, fatigue limit Pu 2.5 kN. Use C in life calculation and C0 for static checks at 85 mm bore." }, { "q": "What is the speed rating of 6217-M?", "a": "SKF lists a 9000 r/min thermal reference speed and a 8000 r/min mechanical limiting speed for 6217 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6217-M and a same-bore 62-series bearing?", "a": "Section height differs: 6217-M has a 32.5 mm radial section and C 87.1 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope as SKF 217, but catalogue C/C0 differ (87.1/64 kN vs 96.8/100 kN) — envelope match only after a load check." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope as SKF 217-2Z, but catalogue C/C0 differ (87.1/64 kN vs 96.8/100 kN) — envelope match only after a load check." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6217 (open arrangement) shares the 85×150×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6217-2Z (two non-contact shields) shares the 85×150×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6217-2RS1 (two contact elastomer seals) shares the 85×150×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6217DDU on the same 85×150×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6217VV on the same 85×150×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6217ZZ on the same 85×150×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6217 on the same 85×150×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6217-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6217 on the same 85×150×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6217-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6217LLU on the same 85×150×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6217-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6217LLB on the same 85×150×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6217-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6217ZZ on the same 85×150×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6217-M", "6217 M" ], "locale_variants": {} }, { "sku": "6317-M", "brand": "SKF", "manufacturer_designation": "6317 M", "series": "6300-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": "brass", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "reference_speed_rpm": 8000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 5200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6317 carries code 17 = 85 mm (code × 5). The envelope is 85×180×41 mm (3.346×7.087×1.614 in) with a 47.5 mm radial section height, C 140 kN, C0 96.5 kN and Pu 3.55 kN. The open 6317 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7500 r/min, catalogue mass 5200 g.", "applications": [ "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "The fatigue load limit is 3.55 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 6317-M chamfer so the 41 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6317-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 5200 g quoted mass includes the heavier cage.", "Open 6317-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6317-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 85 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 6317 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6317-M?", "a": "The SKF 6317 M measures 85 mm bore × 180 mm OD × 41 mm width (3.346 × 7.087 × 1.614 in), mass about 5200 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6317 work?", "a": "The final two digits of 6317 are bore code 17, multiplied by 5 to give 85 mm." }, { "q": "Which fits should I use for 6317-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 180 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6317-M?", "a": "Catalogue mass is 5200 g for 6317 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6317-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope as SKF 317, but catalogue C/C0 differ (140/96.5 kN vs 147/146 kN) — envelope match only after a load check." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope as SKF 317-2Z, but catalogue C/C0 differ (140/96.5 kN vs 147/146 kN) — envelope match only after a load check." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6317 (open arrangement) shares the 85×180×41 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6317-2Z (two non-contact shields) shares the 85×180×41 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6317-2RS1 (two contact elastomer seals) shares the 85×180×41 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6317DDU on the same 85×180×41 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6317VV on the same 85×180×41 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6317ZZ on the same 85×180×41 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6317 on the same 85×180×41 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6317-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6317 on the same 85×180×41 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6317-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6317LLU on the same 85×180×41 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6317-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6317LLB on the same 85×180×41 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6317-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6317ZZ on the same 85×180×41 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6317-M", "6317 M" ], "locale_variants": {} }, { "sku": "6018-M", "brand": "SKF", "manufacturer_designation": "6018 M", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 10000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 1350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6018 carries code 18 = 90 mm (code × 5). The envelope is 90×140×24 mm (3.543×5.512×0.945 in) with a 25.0 mm radial section height, C 60.5 kN, C0 50 kN and Pu 1.96 kN. The open 6018 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 8500 r/min, catalogue mass 1350 g.", "applications": [ "material-handling equipment", "industrial fans", "compressor drives", "machine tool auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "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.", "The fatigue load limit is 1.96 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The M suffix on 6018-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1350 g quoted mass includes the heavier cage.", "Open 6018-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6018-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6018-M (C 60.5 kN, C0 50 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.", "For positions that need relubrication, choose the open execution of 6018 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 6018 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6018-M?", "a": "The SKF 6018 M measures 90 mm bore × 140 mm OD × 24 mm width (3.543 × 5.512 × 0.945 in), mass about 1350 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6018 work?", "a": "The final two digits of 6018 are bore code 18, multiplied by 5 to give 90 mm." }, { "q": "How long can a greased 6018-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6018-M take?", "a": "Catalogue values for 6018 M: dynamic C 60.5 kN, static C0 50 kN, fatigue limit Pu 1.96 kN. Use C in life calculation and C0 for static checks at 90 mm bore." }, { "q": "What is the speed rating of 6018-M?", "a": "SKF lists a 10000 r/min thermal reference speed and a 8500 r/min mechanical limiting speed for 6018 M; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "6018", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6018 (open arrangement) shares the 90×140×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6018-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6018-2Z (two non-contact shields) shares the 90×140×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6018-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6018-2RS1 (two contact elastomer seals) shares the 90×140×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6018-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6018DDU on the same 90×140×24 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6018-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6018VV on the same 90×140×24 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6018-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6018ZZ on the same 90×140×24 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6018-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6018 on the same 90×140×24 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6018-M", "6018 M" ], "locale_variants": {} }, { "sku": "6218-M", "brand": "SKF", "manufacturer_designation": "6218 M", "series": "6200-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": "brass", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6218 carries code 18 = 90 mm (code × 5). The envelope is 90×160×30 mm (3.543×6.299×1.181 in) with a 35.0 mm radial section height, C 101 kN, C0 73.5 kN and Pu 2.8 kN. The open 6218 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5300 r/min, catalogue mass 2650 g.", "applications": [ "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 90 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 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.", "The M suffix on 6218-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 2650 g quoted mass includes the heavier cage.", "Open 6218-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6218-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "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.", "Where two 6218 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6218-M?", "a": "The SKF 6218 M measures 90 mm bore × 160 mm OD × 30 mm width (3.543 × 6.299 × 1.181 in), mass about 2650 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6218 work?", "a": "The final two digits of 6218 are bore code 18, multiplied by 5 to give 90 mm." }, { "q": "What is the speed rating of 6218-M?", "a": "SKF lists a 8500 r/min thermal reference speed and a 5300 r/min mechanical limiting speed for 6218 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6218-M and a same-bore 62-series bearing?", "a": "Section height differs: 6218-M has a 35 mm radial section and C 101 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6218-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 160 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope as SKF 218, but catalogue C/C0 differ (101/73.5 kN vs 112/114 kN) — envelope match only after a load check." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope as SKF 218-2Z, but catalogue C/C0 differ (101/73.5 kN vs 112/114 kN) — envelope match only after a load check." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6218 (open arrangement) shares the 90×160×30 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6218-2Z (two non-contact shields) shares the 90×160×30 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6218-2RS1 (two contact elastomer seals) shares the 90×160×30 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6218DDU on the same 90×160×30 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6218VV on the same 90×160×30 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6218ZZ on the same 90×160×30 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6218 on the same 90×160×30 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6218-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6218 on the same 90×160×30 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6218-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6218LLU on the same 90×160×30 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6218-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6218LLB on the same 90×160×30 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6218-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6218ZZ on the same 90×160×30 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6218-M", "6218 M" ], "locale_variants": {} }, { "sku": "6318-M", "brand": "SKF", "manufacturer_designation": "6318 M", "series": "6300-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": "brass", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 6100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6318 carries code 18 = 90 mm (code × 5). The envelope is 90×190×43 mm (3.543×7.48×1.693 in) with a 50.0 mm radial section height, C 151 kN, C0 108 kN and Pu 3.8 kN. The open 6318 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7000 r/min, catalogue mass 6100 g.", "applications": [ "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Catalogue ratings for 6318-M (C 151 kN, C0 108 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 6318-M (C 151 kN, C0 108 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 M suffix on 6318-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 6100 g quoted mass includes the heavier cage.", "Open 6318-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6318-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 190 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6318-M.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6318-M?", "a": "The SKF 6318 M measures 90 mm bore × 190 mm OD × 43 mm width (3.543 × 7.48 × 1.693 in), mass about 6100 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6318 work?", "a": "The final two digits of 6318 are bore code 18, multiplied by 5 to give 90 mm." }, { "q": "What load can 6318-M take?", "a": "Catalogue values for 6318 M: dynamic C 151 kN, static C0 108 kN, fatigue limit Pu 3.8 kN. Use C in life calculation and C0 for static checks at 90 mm bore." }, { "q": "What is the speed rating of 6318-M?", "a": "SKF lists a 7500 r/min thermal reference speed and a 7000 r/min mechanical limiting speed for 6318 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6318-M and a same-bore 62-series bearing?", "a": "Section height differs: 6318-M has a 50 mm radial section and C 151 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope as SKF 318, but catalogue C/C0 differ (151/108 kN vs 157/160 kN) — envelope match only after a load check." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope as SKF 318-2Z, but catalogue C/C0 differ (151/108 kN vs 157/160 kN) — envelope match only after a load check." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6318 (open arrangement) shares the 90×190×43 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6318-2Z (two non-contact shields) shares the 90×190×43 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6318-2RS1 (two contact elastomer seals) shares the 90×190×43 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6318DDU on the same 90×190×43 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6318VV on the same 90×190×43 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6318ZZ on the same 90×190×43 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6318 on the same 90×190×43 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6318-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6318 on the same 90×190×43 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6318-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6318LLU on the same 90×190×43 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6318-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6318LLB on the same 90×190×43 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6318-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6318ZZ on the same 90×190×43 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6318-M", "6318 M" ], "locale_variants": {} }, { "sku": "6219-M", "brand": "SKF", "manufacturer_designation": "6219 M", "series": "6200-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": "brass", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6219 carries code 19 = 95 mm (code × 5). The envelope is 95×170×32 mm (3.74×6.693×1.26 in) with a 37.5 mm radial section height, C 114 kN, C0 81.5 kN and Pu 3 kN. The open 6219 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5000 r/min, catalogue mass 3200 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 6219-M home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 3 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The M suffix on 6219-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 3200 g quoted mass includes the heavier cage.", "Open 6219-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6219-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6219-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 6219 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 6219 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6219-M?", "a": "The SKF 6219 M measures 95 mm bore × 170 mm OD × 32 mm width (3.74 × 6.693 × 1.26 in), mass about 3200 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6219 work?", "a": "The final two digits of 6219 are bore code 19, multiplied by 5 to give 95 mm." }, { "q": "What load can 6219-M take?", "a": "Catalogue values for 6219 M: dynamic C 114 kN, static C0 81.5 kN, fatigue limit Pu 3 kN. Use C in life calculation and C0 for static checks at 95 mm bore." }, { "q": "What is the speed rating of 6219-M?", "a": "SKF lists a 8000 r/min thermal reference speed and a 5000 r/min mechanical limiting speed for 6219 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6219-M and a same-bore 62-series bearing?", "a": "Section height differs: 6219-M has a 37.5 mm radial section and C 114 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope as SKF 219, but catalogue C/C0 differ (114/81.5 kN vs 121/122 kN) — envelope match only after a load check." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope as SKF 219-2Z, but catalogue C/C0 differ (114/81.5 kN vs 121/122 kN) — envelope match only after a load check." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6219 (open arrangement) shares the 95×170×32 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6219-2Z (two non-contact shields) shares the 95×170×32 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6219-2RS1 (two contact elastomer seals) shares the 95×170×32 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6219DDU on the same 95×170×32 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6219VV on the same 95×170×32 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6219ZZ on the same 95×170×32 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6219 on the same 95×170×32 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6219-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6219 on the same 95×170×32 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6219-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6219LLU on the same 95×170×32 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6219-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6219LLB on the same 95×170×32 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6219-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6219ZZ on the same 95×170×32 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6219-M", "6219 M" ], "locale_variants": {} }, { "sku": "6319-M", "brand": "SKF", "manufacturer_designation": "6319 M", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 7000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 7050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6319 carries code 19 = 95 mm (code × 5). The envelope is 95×200×45 mm (3.74×7.874×1.772 in) with a 52.5 mm radial section height, C 159 kN, C0 118 kN and Pu 4.15 kN. The open 6319 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 6300 r/min, catalogue mass 7050 g.", "applications": [ "compressor drives", "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 200 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6319-M.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6319-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The M suffix on 6319-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 7050 g quoted mass includes the heavier cage.", "Open 6319-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6319-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 4.15 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 6319 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6319-M?", "a": "The SKF 6319 M measures 95 mm bore × 200 mm OD × 45 mm width (3.74 × 7.874 × 1.772 in), mass about 7050 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6319 work?", "a": "The final two digits of 6319 are bore code 19, multiplied by 5 to give 95 mm." }, { "q": "What is the difference between 6319-M and a same-bore 62-series bearing?", "a": "Section height differs: 6319-M has a 52.5 mm radial section and C 159 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6319-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 200 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6319-M?", "a": "Catalogue mass is 7050 g for 6319 M; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6319 (open arrangement) shares the 95×200×45 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6319-2Z (two non-contact shields) shares the 95×200×45 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6319-2RS1 (two contact elastomer seals) shares the 95×200×45 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6319DDU on the same 95×200×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6319VV on the same 95×200×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6319ZZ on the same 95×200×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6319 on the same 95×200×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6319-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6319 on the same 95×200×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6319-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6319LLU on the same 95×200×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6319-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6319LLB on the same 95×200×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6319-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6319ZZ on the same 95×200×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6319-M", "6319 M" ], "locale_variants": {} }, { "sku": "6020-M", "brand": "SKF", "manufacturer_designation": "6020 M", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 9500, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6020 carries code 20 = 100 mm (code × 5). The envelope is 100×150×24 mm (3.937×5.906×0.945 in) with a 25.0 mm radial section height, C 63.7 kN, C0 54 kN and Pu 2.04 kN. The open 6020 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7500 r/min, catalogue mass 1450 g.", "applications": [ "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 6020-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Fillet radii must clear the 6020-M chamfer so the 24 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6020-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1450 g quoted mass includes the heavier cage.", "Open 6020-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6020-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 100 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.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 6020 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 6020-M?", "a": "The SKF 6020 M measures 100 mm bore × 150 mm OD × 24 mm width (3.937 × 5.906 × 0.945 in), mass about 1450 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6020 work?", "a": "The final two digits of 6020 are bore code 20, multiplied by 5 to give 100 mm." }, { "q": "Which fits should I use for 6020-M?", "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 150 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6020-M?", "a": "Catalogue mass is 1450 g for 6020 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6020-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "6020", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6020 (open arrangement) shares the 100×150×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6020-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6020-2Z (two non-contact shields) shares the 100×150×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6020-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6020-2RS1 (two contact elastomer seals) shares the 100×150×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6020-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6020DDU on the same 100×150×24 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6020-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6020VV on the same 100×150×24 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6020-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6020ZZ on the same 100×150×24 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6020-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6020 on the same 100×150×24 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6020-M", "6020 M" ], "locale_variants": {} }, { "sku": "6220-M", "brand": "SKF", "manufacturer_designation": "6220 M", "series": "6200-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": "brass", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 3800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6220 carries code 20 = 100 mm (code × 5). The envelope is 100×180×34 mm (3.937×7.087×1.339 in) with a 40.0 mm radial section height, C 127 kN, C0 93 kN and Pu 3.35 kN. The open 6220 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7000 r/min, catalogue mass 3800 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 6220-M home through the outer ring or balls brinells the raceways.", "Mount by heating the inner ring (max 120 °C) — driving 6220-M home through the outer ring or balls brinells the raceways.", "The M suffix on 6220-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 3800 g quoted mass includes the heavier cage.", "Open 6220-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6220-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 100 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.", "A replacement 6220 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 6220 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6220-M?", "a": "The SKF 6220 M measures 100 mm bore × 180 mm OD × 34 mm width (3.937 × 7.087 × 1.339 in), mass about 3800 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6220 work?", "a": "The final two digits of 6220 are bore code 20, multiplied by 5 to give 100 mm." }, { "q": "How heavy is 6220-M?", "a": "Catalogue mass is 3800 g for 6220 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6220-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6220-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope as SKF 220, but catalogue C/C0 differ (127/93 kN vs 134/140 kN) — envelope match only after a load check." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope as SKF 220-2Z, but catalogue C/C0 differ (127/93 kN vs 134/140 kN) — envelope match only after a load check." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6220 (open arrangement) shares the 100×180×34 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6220-2Z (two non-contact shields) shares the 100×180×34 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6220-2RS1 (two contact elastomer seals) shares the 100×180×34 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6220DDU on the same 100×180×34 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6220VV on the same 100×180×34 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6220ZZ on the same 100×180×34 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6220 on the same 100×180×34 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6220-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6220 on the same 100×180×34 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6220-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6220LLU on the same 100×180×34 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6220-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6220LLB on the same 100×180×34 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6220-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6220ZZ on the same 100×180×34 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6220-M", "6220 M" ], "locale_variants": {} }, { "sku": "6320-M", "brand": "SKF", "manufacturer_designation": "6320 M", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 174, "static_load_kN": 140, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 6700, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 8700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6320 carries code 20 = 100 mm (code × 5). The envelope is 100×215×47 mm (3.937×8.465×1.85 in) with a 57.5 mm radial section height, C 174 kN, C0 140 kN and Pu 4.75 kN. The open 6320 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 6000 r/min, catalogue mass 8700 g.", "applications": [ "compressor drives", "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Do not preload 6320-M 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 6320-M chamfer so the 47 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6320-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 8700 g quoted mass includes the heavier cage.", "Open 6320-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6320-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 215 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6320-M.", "Where two 6320 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 6320 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6320-M?", "a": "The SKF 6320 M measures 100 mm bore × 215 mm OD × 47 mm width (3.937 × 8.465 × 1.85 in), mass about 8700 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6320 work?", "a": "The final two digits of 6320 are bore code 20, multiplied by 5 to give 100 mm." }, { "q": "What internal clearance does 6320-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6320-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6320-M take?", "a": "Catalogue values for 6320 M: dynamic C 174 kN, static C0 140 kN, fatigue limit Pu 4.75 kN. Use C in life calculation and C0 for static checks at 100 mm bore." } ], "cross_ref": [ { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6320-2Z (two non-contact shields) shares the 100×215×47 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6320-2RS1 (two contact elastomer seals) shares the 100×215×47 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6320DDU on the same 100×215×47 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6320VV on the same 100×215×47 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6320ZZ on the same 100×215×47 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6320 on the same 100×215×47 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6320-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6320 on the same 100×215×47 mm envelope, but catalogue C/C0 differ (174/140 kN vs 192/141 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6320-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6320LLU on the same 100×215×47 mm envelope, but catalogue C/C0 differ (174/140 kN vs 192/141 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6320-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6320LLB on the same 100×215×47 mm envelope, but catalogue C/C0 differ (174/140 kN vs 192/141 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6320-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6320ZZ on the same 100×215×47 mm envelope, but catalogue C/C0 differ (174/140 kN vs 192/141 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": [ "6320-M", "6320 M" ], "locale_variants": {} }, { "sku": "6021-M", "brand": "SKF", "manufacturer_designation": "6021 M", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 8500, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 1850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6021 carries code 21 = 105 mm (code × 5). The envelope is 105×160×26 mm (4.134×6.299×1.024 in) with a 27.5 mm radial section height, C 76.1 kN, C0 65.5 kN and Pu 2.4 kN. The open 6021 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7500 r/min, catalogue mass 1850 g.", "applications": [ "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Catalogue ratings for 6021-M (C 76.1 kN, C0 65.5 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.", "Catalogue ratings for 6021-M (C 76.1 kN, C0 65.5 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.", "The M suffix on 6021-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1850 g quoted mass includes the heavier cage.", "Open 6021-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6021-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 2.4 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 6021 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 6021 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6021-M?", "a": "The SKF 6021 M measures 105 mm bore × 160 mm OD × 26 mm width (4.134 × 6.299 × 1.024 in), mass about 1850 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6021 work?", "a": "The final two digits of 6021 are bore code 21, multiplied by 5 to give 105 mm." }, { "q": "What internal clearance does 6021-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6021-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6021-M take?", "a": "Catalogue values for 6021 M: dynamic C 76.1 kN, static C0 65.5 kN, fatigue limit Pu 2.4 kN. Use C in life calculation and C0 for static checks at 105 mm bore." } ], "cross_ref": [ { "equiv_sku": "6021", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6021 (open arrangement) shares the 105×160×26 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6021-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6021-2RS1 (two contact elastomer seals) shares the 105×160×26 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6021-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6021-2Z (two non-contact shields) shares the 105×160×26 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6021-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6021DDU on the same 105×160×26 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6021-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6021VV on the same 105×160×26 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6021-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6021ZZ on the same 105×160×26 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6021-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6021 on the same 105×160×26 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6021-M", "6021 M" ], "locale_variants": {} }, { "sku": "61922-MA", "brand": "SKF", "manufacturer_designation": "61922 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 43.6, "static_load_kN": 45, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 9000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61922 carries code 22 = 110 mm (code × 5). The envelope is 110×150×20 mm (4.331×5.906×0.787 in) with a 20.0 mm radial section height, C 43.6 kN, C0 45 kN and Pu 1.66 kN. The open 61922 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7500 r/min, catalogue mass 1050 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "slew and indexing drives", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "The fatigue load limit is 1.66 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 61922-MA chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MA suffix on 61922-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1050 g quoted mass includes the heavier cage.", "Open 61922-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61922-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 110 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 61922 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61922-MA?", "a": "The SKF 61922 MA measures 110 mm bore × 150 mm OD × 20 mm width (4.331 × 5.906 × 0.787 in), mass about 1050 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61922 work?", "a": "The final two digits of 61922 are bore code 22, multiplied by 5 to give 110 mm." }, { "q": "How long can a greased 61922-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 61922-MA take?", "a": "Catalogue values for 61922 MA: dynamic C 43.6 kN, static C0 45 kN, fatigue limit Pu 1.66 kN. Use C in life calculation and C0 for static checks at 110 mm bore." }, { "q": "What is the speed rating of 61922-MA?", "a": "SKF lists a 9000 r/min thermal reference speed and a 7500 r/min mechanical limiting speed for 61922 MA; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61922 (open arrangement) shares the 110×150×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6922DDU on the same 110×150×20 mm envelope, but catalogue C/C0 differ (43.6/45 kN vs 48/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6922VV on the same 110×150×20 mm envelope, but catalogue C/C0 differ (43.6/45 kN vs 48/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6922ZZ on the same 110×150×20 mm envelope, but catalogue C/C0 differ (43.6/45 kN vs 48/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6922 on the same 110×150×20 mm envelope, but catalogue C/C0 differ (43.6/45 kN vs 48/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61922-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6922 on the same 110×150×20 mm envelope, but catalogue C/C0 differ (43.6/45 kN vs 48.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61922-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6922LLU on the same 110×150×20 mm envelope, but catalogue C/C0 differ (43.6/45 kN vs 48.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61922-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6922LLB on the same 110×150×20 mm envelope, but catalogue C/C0 differ (43.6/45 kN vs 48.5/44.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61922-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6922ZZ on the same 110×150×20 mm envelope, but catalogue C/C0 differ (43.6/45 kN vs 48.5/44.5 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": [ "61922-MA", "61922 MA" ], "locale_variants": {} }, { "sku": "6022-M", "brand": "SKF", "manufacturer_designation": "6022 M", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6022 carries code 22 = 110 mm (code × 5). The envelope is 110×170×28 mm (4.331×6.693×1.102 in) with a 30.0 mm radial section height, C 85.2 kN, C0 73.5 kN and Pu 2.6 kN. The open 6022 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7000 r/min, catalogue mass 2300 g.", "applications": [ "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans", "compressor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Do not preload 6022-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Mount by heating the inner ring (max 120 °C) — driving 6022-M home through the outer ring or balls brinells the raceways.", "The M suffix on 6022-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 2300 g quoted mass includes the heavier cage.", "Open 6022-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6022-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6022-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 6022 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6022-M?", "a": "The SKF 6022 M measures 110 mm bore × 170 mm OD × 28 mm width (4.331 × 6.693 × 1.102 in), mass about 2300 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6022 work?", "a": "The final two digits of 6022 are bore code 22, multiplied by 5 to give 110 mm." }, { "q": "How heavy is 6022-M?", "a": "Catalogue mass is 2300 g for 6022 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6022-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6022-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6022", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6022 (open arrangement) shares the 110×170×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6022-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6022-2RS1 (two contact elastomer seals) shares the 110×170×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6022-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6022-2Z (two non-contact shields) shares the 110×170×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6022-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6022DDU on the same 110×170×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6022-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6022VV on the same 110×170×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6022-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6022ZZ on the same 110×170×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6022-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6022 on the same 110×170×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6022-M", "6022 M" ], "locale_variants": {} }, { "sku": "6322-M", "brand": "SKF", "manufacturer_designation": "6322 M", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 203, "static_load_kN": 180, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 6000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6322 carries code 22 = 110 mm (code × 5). The envelope is 110×240×50 mm (4.331×9.449×1.969 in) with a 65.0 mm radial section height, C 203 kN, C0 180 kN and Pu 5.7 kN. The open 6322 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5300 r/min, catalogue mass 11500 g.", "applications": [ "material-handling equipment", "industrial fans", "compressor drives", "machine tool auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 110 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 110 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.", "The M suffix on 6322-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 11500 g quoted mass includes the heavier cage.", "Open 6322-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6322-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6322-M (C 203 kN, C0 180 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.", "For positions that need relubrication, choose the open execution of 6322 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6322-M?", "a": "The SKF 6322 M measures 110 mm bore × 240 mm OD × 50 mm width (4.331 × 9.449 × 1.969 in), mass about 11500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6322 work?", "a": "The final two digits of 6322 are bore code 22, multiplied by 5 to give 110 mm." }, { "q": "How heavy is 6322-M?", "a": "Catalogue mass is 11500 g for 6322 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6322-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6322-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6322 (open arrangement) shares the 110×240×50 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6322ZZ on the same 110×240×50 mm envelope, but catalogue C/C0 differ (203/180 kN vs 226/179 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6322 on the same 110×240×50 mm envelope, but catalogue C/C0 differ (203/180 kN vs 226/179 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6322-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6322 on the same 110×240×50 mm envelope, but catalogue C/C0 differ (203/180 kN vs 227/179 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6322-2RS", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6322LLU on the same 110×240×50 mm envelope, but catalogue C/C0 differ (203/180 kN vs 227/179 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6322-RSR", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6322LLB on the same 110×240×50 mm envelope, but catalogue C/C0 differ (203/180 kN vs 227/179 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6322-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6322ZZ on the same 110×240×50 mm envelope, but catalogue C/C0 differ (203/180 kN vs 227/179 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": [ "6322-M", "6322 M" ], "locale_variants": {} }, { "sku": "61924-MA", "brand": "SKF", "manufacturer_designation": "61924 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 55.3, "static_load_kN": 57, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 8000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61924 carries code 24 = 120 mm (code × 5). The envelope is 120×165×22 mm (4.724×6.496×0.866 in) with a 22.5 mm radial section height, C 55.3 kN, C0 57 kN and Pu 2.04 kN. The open 61924 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 6700 r/min, catalogue mass 1400 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "compressor drives", "machine tool auxiliaries", "agricultural gearboxes", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 120 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 61924-MA (C 55.3 kN, C0 57 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 MA suffix on 61924-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1400 g quoted mass includes the heavier cage.", "Open 61924-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61924-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 61924-MA chamfer so the 22 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 61924 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 61924-MA?", "a": "The SKF 61924 MA measures 120 mm bore × 165 mm OD × 22 mm width (4.724 × 6.496 × 0.866 in), mass about 1400 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61924 work?", "a": "The final two digits of 61924 are bore code 24, multiplied by 5 to give 120 mm." }, { "q": "What load can 61924-MA take?", "a": "Catalogue values for 61924 MA: dynamic C 55.3 kN, static C0 57 kN, fatigue limit Pu 2.04 kN. Use C in life calculation and C0 for static checks at 120 mm bore." }, { "q": "What is the speed rating of 61924-MA?", "a": "SKF lists a 8000 r/min thermal reference speed and a 6700 r/min mechanical limiting speed for 61924 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61924-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61924-MA has a 22.5 mm radial section and C 55.3 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61924 (open arrangement) shares the 120×165×22 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6924ZZ on the same 120×165×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61924-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6924 on the same 120×165×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61924-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6924 on the same 120×165×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61924-2RS", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6924LLU on the same 120×165×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61924-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6924ZZ on the same 120×165×22 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "61924-MA", "61924 MA" ], "locale_variants": {} }, { "sku": "16024", "brand": "SKF", "manufacturer_designation": "16024", "series": "16000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63.7, "static_load_kN": 64, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, the last two digits encode the bore: 16024 carries code 24 = 120 mm (code × 5). The envelope is 120×180×19 mm (4.724×7.087×0.748 in) with a 30.0 mm radial section height, C 63.7 kN, C0 64 kN and Pu 2.2 kN. The open 16024 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 4800 r/min, catalogue mass 1550 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "agricultural gearboxes", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "At 120 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 120 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.", "Open 16024 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16024; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 16024 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 16024-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 16024 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 16024?", "a": "The SKF 16024 measures 120 mm bore × 180 mm OD × 19 mm width (4.724 × 7.087 × 0.748 in), mass about 1550 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16024 work?", "a": "The final two digits of 16024 are bore code 24, multiplied by 5 to give 120 mm." }, { "q": "What internal clearance does 16024 have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 16024 be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 16024 take?", "a": "Catalogue values for 16024: dynamic C 63.7 kN, static C0 64 kN, fatigue limit Pu 2.2 kN. Use C in life calculation and C0 for static checks at 120 mm bore." } ], "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": [ "16024", "16024" ], "locale_variants": {} }, { "sku": "6024-MA", "brand": "SKF", "manufacturer_designation": "6024 MA", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 7500, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 2450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6024 carries code 24 = 120 mm (code × 5). The envelope is 120×180×28 mm (4.724×7.087×1.102 in) with a 30.0 mm radial section height, C 88.4 kN, C0 80 kN and Pu 2.75 kN. The open 6024 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 6300 r/min, catalogue mass 2450 g.", "applications": [ "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 6024-MA home through the outer ring or balls brinells the raceways.", "At 120 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.", "The MA suffix on 6024-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 2450 g quoted mass includes the heavier cage.", "Open 6024-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6024-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6024-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6024-MA?", "a": "The SKF 6024 MA measures 120 mm bore × 180 mm OD × 28 mm width (4.724 × 7.087 × 1.102 in), mass about 2450 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6024 work?", "a": "The final two digits of 6024 are bore code 24, multiplied by 5 to give 120 mm." }, { "q": "Which fits should I use for 6024-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 180 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6024-MA?", "a": "Catalogue mass is 2450 g for 6024 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6024-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "6024", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6024 (open arrangement) shares the 120×180×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6024-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6024-2RS1 (two contact elastomer seals) shares the 120×180×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6024-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6024-2Z (two non-contact shields) shares the 120×180×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6024DDU on the same 120×180×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6024VV on the same 120×180×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6024ZZ on the same 120×180×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6024 on the same 120×180×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6024-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6024 on the same 120×180×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6024-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6024LLU on the same 120×180×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6024-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6024LLB on the same 120×180×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6024-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6024ZZ on the same 120×180×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6024-MA", "6024 MA" ], "locale_variants": {} }, { "sku": "6224-M", "brand": "SKF", "manufacturer_designation": "6224 M", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 6100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6224 carries code 24 = 120 mm (code × 5). The envelope is 120×215×40 mm (4.724×8.465×1.575 in) with a 47.5 mm radial section height, C 146 kN, C0 118 kN and Pu 3.9 kN. The open 6224 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5600 r/min, catalogue mass 6100 g.", "applications": [ "machine tool auxiliaries", "agricultural gearboxes", "industrial electric motors", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Catalogue ratings for 6224-M (C 146 kN, C0 118 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.", "Do not preload 6224-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6224-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 6100 g quoted mass includes the heavier cage.", "Open 6224-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6224-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6224-M (C 146 kN, C0 118 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.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6224-M?", "a": "The SKF 6224 M measures 120 mm bore × 215 mm OD × 40 mm width (4.724 × 8.465 × 1.575 in), mass about 6100 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6224 work?", "a": "The final two digits of 6224 are bore code 24, multiplied by 5 to give 120 mm." }, { "q": "How heavy is 6224-M?", "a": "Catalogue mass is 6100 g for 6224 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6224-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6224-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6224", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6224 (open arrangement) shares the 120×215×40 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6224-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6224-2RS1 (two contact elastomer seals) shares the 120×215×40 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6224-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6224-2Z (two non-contact shields) shares the 120×215×40 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6224DDU on the same 120×215×40 mm envelope, but catalogue C/C0 differ (146/118 kN vs 171/131 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6224VV on the same 120×215×40 mm envelope, but catalogue C/C0 differ (146/118 kN vs 171/131 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6224ZZ on the same 120×215×40 mm envelope, but catalogue C/C0 differ (146/118 kN vs 171/131 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6224 on the same 120×215×40 mm envelope, but catalogue C/C0 differ (146/118 kN vs 171/131 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6224-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6224 on the same 120×215×40 mm envelope, but catalogue C/C0 differ (146/118 kN vs 172/131 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6224-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6224LLU on the same 120×215×40 mm envelope, but catalogue C/C0 differ (146/118 kN vs 172/131 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6224-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6224ZZ on the same 120×215×40 mm envelope, but catalogue C/C0 differ (146/118 kN vs 172/131 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": [ "6224-M", "6224 M" ], "locale_variants": {} }, { "sku": "6324-M", "brand": "SKF", "manufacturer_designation": "6324 M", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 5600, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6324 carries code 24 = 120 mm (code × 5). The envelope is 120×260×55 mm (4.724×10.236×2.165 in) with a 70.0 mm radial section height, C 208 kN, C0 186 kN and Pu 5.7 kN. The open 6324 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5000 r/min, catalogue mass 14000 g.", "applications": [ "gearboxes and speed reducers", "centrifugal and positive-displacement pumps", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 260 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6324-M.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6324-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The M suffix on 6324-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 14000 g quoted mass includes the heavier cage.", "Open 6324-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6324-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6324-M (C 208 kN, C0 186 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.", "For positions that need relubrication, choose the open execution of 6324 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 6324 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6324-M?", "a": "The SKF 6324 M measures 120 mm bore × 260 mm OD × 55 mm width (4.724 × 10.236 × 2.165 in), mass about 14000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6324 work?", "a": "The final two digits of 6324 are bore code 24, multiplied by 5 to give 120 mm." }, { "q": "What internal clearance does 6324-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6324-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6324-M take?", "a": "Catalogue values for 6324 M: dynamic C 208 kN, static C0 186 kN, fatigue limit Pu 5.7 kN. Use C in life calculation and C0 for static checks at 120 mm bore." } ], "cross_ref": [ { "equiv_sku": "6324", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6324 (open arrangement) shares the 120×260×55 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6324-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6324-2RS1 (two contact elastomer seals) shares the 120×260×55 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6324-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6324-2Z (two non-contact shields) shares the 120×260×55 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6324DDU on the same 120×260×55 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6324ZZ on the same 120×260×55 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6324 on the same 120×260×55 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6324-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6324 on the same 120×260×55 mm envelope, but catalogue C/C0 differ (208/186 kN vs 229/185 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6324-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6324LLU on the same 120×260×55 mm envelope, but catalogue C/C0 differ (208/186 kN vs 229/185 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6324-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6324ZZ on the same 120×260×55 mm envelope, but catalogue C/C0 differ (208/186 kN vs 229/185 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": [ "6324-M", "6324 M" ], "locale_variants": {} }, { "sku": "6026-M", "brand": "SKF", "manufacturer_designation": "6026 M", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 3750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6026 carries code 26 = 130 mm (code × 5). The envelope is 130×200×33 mm (5.118×7.874×1.299 in) with a 35.0 mm radial section height, C 112 kN, C0 100 kN and Pu 3.35 kN. The open 6026 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5600 r/min, catalogue mass 3750 g.", "applications": [ "marine deck machinery", "crusher auxiliary drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Do not preload 6026-M 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 6026-M (C 112 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.", "The M suffix on 6026-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 3750 g quoted mass includes the heavier cage.", "Open 6026-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6026-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 130 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.", "A replacement 6026 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6026-M?", "a": "The SKF 6026 M measures 130 mm bore × 200 mm OD × 33 mm width (5.118 × 7.874 × 1.299 in), mass about 3750 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6026 work?", "a": "The final two digits of 6026 are bore code 26, multiplied by 5 to give 130 mm." }, { "q": "Which fits should I use for 6026-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 200 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6026-M?", "a": "Catalogue mass is 3750 g for 6026 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6026-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "6026", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6026 (open arrangement) shares the 130×200×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6026-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6026-2RS1 (two contact elastomer seals) shares the 130×200×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6026-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6026-2Z (two non-contact shields) shares the 130×200×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6026 on the same 130×200×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6026-2RSR on the same 130×200×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6026-2Z on the same 130×200×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6026DDU on the same 130×200×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6026ZZ on the same 130×200×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6026 on the same 130×200×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6026-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6026 on the same 130×200×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6026-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6026LLU on the same 130×200×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6026-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6026ZZ on the same 130×200×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6026-M", "6026 M" ], "locale_variants": {} }, { "sku": "6226-M", "brand": "SKF", "manufacturer_designation": "6226 M", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 6950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6226 carries code 26 = 130 mm (code × 5). The envelope is 130×230×40 mm (5.118×9.055×1.575 in) with a 50.0 mm radial section height, C 156 kN, C0 132 kN and Pu 4.15 kN. The open 6226 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5300 r/min, catalogue mass 6950 g.", "applications": [ "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 130 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 130 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 M suffix on 6226-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 6950 g quoted mass includes the heavier cage.", "Open 6226-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6226-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 6226-M home through the outer ring or balls brinells the raceways.", "A replacement 6226 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 6226 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6226-M?", "a": "The SKF 6226 M measures 130 mm bore × 230 mm OD × 40 mm width (5.118 × 9.055 × 1.575 in), mass about 6950 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6226 work?", "a": "The final two digits of 6226 are bore code 26, multiplied by 5 to give 130 mm." }, { "q": "Which fits should I use for 6226-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 230 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6226-M?", "a": "Catalogue mass is 6950 g for 6226 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6226-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "6226", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6226 (open arrangement) shares the 130×230×40 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6226-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6226-2RS1 (two contact elastomer seals) shares the 130×230×40 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6226-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6226-2Z (two non-contact shields) shares the 130×230×40 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6226 on the same 130×230×40 mm envelope, but catalogue C/C0 differ (156/132 kN vs 177/146 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6226-2Z on the same 130×230×40 mm envelope, but catalogue C/C0 differ (156/132 kN vs 177/146 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6226ZZ on the same 130×230×40 mm envelope, but catalogue C/C0 differ (156/132 kN vs 184/146 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6226 on the same 130×230×40 mm envelope, but catalogue C/C0 differ (156/132 kN vs 184/146 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6226-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6226 on the same 130×230×40 mm envelope, but catalogue C/C0 differ (156/132 kN vs 185/146 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6226-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6226LLU on the same 130×230×40 mm envelope, but catalogue C/C0 differ (156/132 kN vs 185/146 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6226-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6226ZZ on the same 130×230×40 mm envelope, but catalogue C/C0 differ (156/132 kN vs 185/146 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": [ "6226-M", "6226 M" ], "locale_variants": {} }, { "sku": "6326-M", "brand": "SKF", "manufacturer_designation": "6326 M", "series": "6300-series", "type": "deep_groove", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 229, "static_load_kN": 216, "fatigue_load_limit_kN": 6.3, "reference_speed_rpm": 5000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6326 carries code 26 = 130 mm (code × 5). The envelope is 130×280×58 mm (5.118×11.024×2.283 in) with a 75.0 mm radial section height, C 229 kN, C0 216 kN and Pu 6.3 kN. The open 6326 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4500 r/min, catalogue mass 17500 g.", "applications": [ "crusher auxiliary drives", "large industrial gearboxes", "heavy conveyor drives", "hoists and winches" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 6326-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6326-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The M suffix on 6326-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 17500 g quoted mass includes the heavier cage.", "Open 6326-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6326-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 130 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.", "Where two 6326 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6326-M?", "a": "The SKF 6326 M measures 130 mm bore × 280 mm OD × 58 mm width (5.118 × 11.024 × 2.283 in), mass about 17500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6326 work?", "a": "The final two digits of 6326 are bore code 26, multiplied by 5 to give 130 mm." }, { "q": "What load can 6326-M take?", "a": "Catalogue values for 6326 M: dynamic C 229 kN, static C0 216 kN, fatigue limit Pu 6.3 kN. Use C in life calculation and C0 for static checks at 130 mm bore." }, { "q": "What is the speed rating of 6326-M?", "a": "SKF lists a 5000 r/min thermal reference speed and a 4500 r/min mechanical limiting speed for 6326 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6326-M and a same-bore 62-series bearing?", "a": "Section height differs: 6326-M has a 75 mm radial section and C 229 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "6326", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6326 (open arrangement) shares the 130×280×58 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6326-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6326 on the same 130×280×58 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6326-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6326ZZ on the same 130×280×58 mm envelope, but catalogue C/C0 differ (229/216 kN vs 252/214 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6326-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6326 on the same 130×280×58 mm envelope, but catalogue C/C0 differ (229/216 kN vs 252/214 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6326-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6326 on the same 130×280×58 mm envelope, but catalogue C/C0 differ (229/216 kN vs 254/214 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": [ "6326-M", "6326 M" ], "locale_variants": {} }, { "sku": "61928-MA", "brand": "SKF", "manufacturer_designation": "61928 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 66.3, "static_load_kN": 72, "fatigue_load_limit_kN": 2.36, "reference_speed_rpm": 7000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 2000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61928 carries code 28 = 140 mm (code × 5). The envelope is 140×190×24 mm (5.512×7.48×0.945 in) with a 25.0 mm radial section height, C 66.3 kN, C0 72 kN and Pu 2.36 kN. The open 61928 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5600 r/min, catalogue mass 2000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Do not preload 61928-MA 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 140 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 MA suffix on 61928-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 2000 g quoted mass includes the heavier cage.", "Open 61928-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61928-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 190 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61928-MA.", "Where two 61928 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 61928 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 61928-MA?", "a": "The SKF 61928 MA measures 140 mm bore × 190 mm OD × 24 mm width (5.512 × 7.48 × 0.945 in), mass about 2000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61928 work?", "a": "The final two digits of 61928 are bore code 28, multiplied by 5 to give 140 mm." }, { "q": "What is the speed rating of 61928-MA?", "a": "SKF lists a 7000 r/min thermal reference speed and a 5600 r/min mechanical limiting speed for 61928 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61928-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61928-MA has a 25 mm radial section and C 66.3 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61928-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 190 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61928 (open arrangement) shares the 140×190×24 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61928-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6928VV on the same 140×190×24 mm envelope, but catalogue C/C0 differ (66.3/72 kN vs 73.5/72 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6928ZZ on the same 140×190×24 mm envelope, but catalogue C/C0 differ (66.3/72 kN vs 73.5/72 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61928-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6928 on the same 140×190×24 mm envelope, but catalogue C/C0 differ (66.3/72 kN vs 73.5/72 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61928-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6928 on the same 140×190×24 mm envelope, but catalogue C/C0 differ (66.3/72 kN vs 74/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61928-2RS", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6928LLU on the same 140×190×24 mm envelope, but catalogue C/C0 differ (66.3/72 kN vs 74/71.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61928-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6928ZZ on the same 140×190×24 mm envelope, but catalogue C/C0 differ (66.3/72 kN vs 74/71.5 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": [ "61928-MA", "61928 MA" ], "locale_variants": {} }, { "sku": "6028-M", "brand": "SKF", "manufacturer_designation": "6028 M", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 6700, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 4000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6028 carries code 28 = 140 mm (code × 5). The envelope is 140×210×33 mm (5.512×8.268×1.299 in) with a 35.0 mm radial section height, C 111 kN, C0 108 kN and Pu 3.45 kN. The open 6028 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5300 r/min, catalogue mass 4000 g.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Do not preload 6028-M 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 6028-M (C 111 kN, C0 108 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 M suffix on 6028-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 4000 g quoted mass includes the heavier cage.", "Open 6028-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6028-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 6028-M chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6028-M?", "a": "The SKF 6028 M measures 140 mm bore × 210 mm OD × 33 mm width (5.512 × 8.268 × 1.299 in), mass about 4000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6028 work?", "a": "The final two digits of 6028 are bore code 28, multiplied by 5 to give 140 mm." }, { "q": "What internal clearance does 6028-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6028-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6028-M take?", "a": "Catalogue values for 6028 M: dynamic C 111 kN, static C0 108 kN, fatigue limit Pu 3.45 kN. Use C in life calculation and C0 for static checks at 140 mm bore." } ], "cross_ref": [ { "equiv_sku": "6028", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6028 (open arrangement) shares the 140×210×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6028-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6028-2RS1 (two contact elastomer seals) shares the 140×210×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6028-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6028-2Z (two non-contact shields) shares the 140×210×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6028 on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6028-2RSR on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6028-2Z on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6028DDU on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6028ZZ on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6028 on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6028-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6028 on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6028-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6028LLU on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6028-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6028ZZ on the same 140×210×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6028-M", "6028 M" ], "locale_variants": {} }, { "sku": "6228-MA", "brand": "SKF", "manufacturer_designation": "6228 MA", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 165, "static_load_kN": 150, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 5300, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 9400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6228 carries code 28 = 140 mm (code × 5). The envelope is 140×250×42 mm (5.512×9.843×1.654 in) with a 55.0 mm radial section height, C 165 kN, C0 150 kN and Pu 4.55 kN. The open 6228 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4800 r/min, catalogue mass 9400 g.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 140 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. 6228-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MA suffix on 6228-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 9400 g quoted mass includes the heavier cage.", "Open 6228-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6228-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6228-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6228-MA?", "a": "The SKF 6228 MA measures 140 mm bore × 250 mm OD × 42 mm width (5.512 × 9.843 × 1.654 in), mass about 9400 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6228 work?", "a": "The final two digits of 6228 are bore code 28, multiplied by 5 to give 140 mm." }, { "q": "How long can a greased 6228-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6228-MA take?", "a": "Catalogue values for 6228 MA: dynamic C 165 kN, static C0 150 kN, fatigue limit Pu 4.55 kN. Use C in life calculation and C0 for static checks at 140 mm bore." }, { "q": "What is the speed rating of 6228-MA?", "a": "SKF lists a 5300 r/min thermal reference speed and a 4800 r/min mechanical limiting speed for 6228 MA; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "6228", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6228 (open arrangement) shares the 140×250×42 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6228-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 6228 on the same 140×250×42 mm envelope, but catalogue C/C0 differ (165/150 kN vs 188/165 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6228-2RS", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6228DDU on the same 140×250×42 mm envelope, but catalogue C/C0 differ (165/150 kN vs 183/150 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6228-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6228ZZ on the same 140×250×42 mm envelope, but catalogue C/C0 differ (165/150 kN vs 183/150 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6228-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6228 on the same 140×250×42 mm envelope, but catalogue C/C0 differ (165/150 kN vs 183/150 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6228-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6228 on the same 140×250×42 mm envelope, but catalogue C/C0 differ (165/150 kN vs 184/150 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6228-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6228LLU on the same 140×250×42 mm envelope, but catalogue C/C0 differ (165/150 kN vs 184/150 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6228-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6228ZZ on the same 140×250×42 mm envelope, but catalogue C/C0 differ (165/150 kN vs 184/150 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": [ "6228-MA", "6228 MA" ], "locale_variants": {} }, { "sku": "6328-M", "brand": "SKF", "manufacturer_designation": "6328 M", "series": "6300-series", "type": "deep_groove", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 251, "static_load_kN": 245, "fatigue_load_limit_kN": 7.1, "reference_speed_rpm": 4800, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 21000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6328 carries code 28 = 140 mm (code × 5). The envelope is 140×300×62 mm (5.512×11.811×2.441 in) with a 80.0 mm radial section height, C 251 kN, C0 245 kN and Pu 7.1 kN. The open 6328 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4300 r/min, catalogue mass 21000 g.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "large industrial gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Catalogue ratings for 6328-M (C 251 kN, C0 245 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. 6328-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The M suffix on 6328-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 21000 g quoted mass includes the heavier cage.", "Open 6328-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6328-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 140 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 6328 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6328-M?", "a": "The SKF 6328 M measures 140 mm bore × 300 mm OD × 62 mm width (5.512 × 11.811 × 2.441 in), mass about 21000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6328 work?", "a": "The final two digits of 6328 are bore code 28, multiplied by 5 to give 140 mm." }, { "q": "What is the difference between 6328-M and a same-bore 62-series bearing?", "a": "Section height differs: 6328-M has a 80 mm radial section and C 251 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6328-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 300 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6328-M?", "a": "Catalogue mass is 21000 g for 6328 M; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "6328", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6328 (open arrangement) shares the 140×300×62 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6328-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6328ZZ on the same 140×300×62 mm envelope, but catalogue C/C0 differ (251/245 kN vs 278/246 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6328-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6328 on the same 140×300×62 mm envelope, but catalogue C/C0 differ (251/245 kN vs 278/246 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6328-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6328 on the same 140×300×62 mm envelope, but catalogue C/C0 differ (251/245 kN vs 280/246 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": [ "6328-M", "6328 M" ], "locale_variants": {} }, { "sku": "61830-MA", "brand": "SKF", "manufacturer_designation": "61830 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 48.8, "static_load_kN": 61, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61830 carries code 30 = 150 mm (code × 5). The envelope is 150×190×20 mm (5.906×7.48×0.787 in) with a 20.0 mm radial section height, C 48.8 kN, C0 61 kN and Pu 1.96 kN. The open 61830 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4300 r/min, catalogue mass 1350 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives", "hoists and winches" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 190 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61830-MA.", "The fatigue load limit is 1.96 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 61830-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 1350 g quoted mass includes the heavier cage.", "Open 61830-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61830-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 150 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 61830 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61830-MA?", "a": "The SKF 61830 MA measures 150 mm bore × 190 mm OD × 20 mm width (5.906 × 7.48 × 0.787 in), mass about 1350 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61830 work?", "a": "The final two digits of 61830 are bore code 30, multiplied by 5 to give 150 mm." }, { "q": "What is the difference between 61830-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61830-MA has a 20 mm radial section and C 48.8 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61830-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 190 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61830-MA?", "a": "Catalogue mass is 1350 g for 61830 MA; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "61830", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61830 (open arrangement) shares the 150×190×20 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61830-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 61830 on the same 150×190×20 mm envelope, but catalogue C/C0 differ (48.8/61 kN vs 54/60 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61830-2RS", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6830DDU on the same 150×190×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61830-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6830VV on the same 150×190×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61830-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6830ZZ on the same 150×190×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61830-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6830 on the same 150×190×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61830-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6830 on the same 150×190×20 mm envelope, but catalogue C/C0 differ (48.8/61 kN vs 53/55 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61830-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6830LLU on the same 150×190×20 mm envelope, but catalogue C/C0 differ (48.8/61 kN vs 53/55 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61830-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6830ZZ on the same 150×190×20 mm envelope, but catalogue C/C0 differ (48.8/61 kN vs 53/55 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": [ "61830-MA", "61830 MA" ], "locale_variants": {} }, { "sku": "61930-MA", "brand": "SKF", "manufacturer_designation": "61930 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 88.4, "static_load_kN": 93, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 3050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61930 carries code 30 = 150 mm (code × 5). The envelope is 150×210×28 mm (5.906×8.268×1.102 in) with a 30.0 mm radial section height, C 88.4 kN, C0 93 kN and Pu 2.9 kN. The open 61930 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5300 r/min, catalogue mass 3050 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "The fatigue load limit is 2.9 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 2.9 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 61930-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 3050 g quoted mass includes the heavier cage.", "Open 61930-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61930-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 61930-MA (C 88.4 kN, C0 93 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.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 61930-MA?", "a": "The SKF 61930 MA measures 150 mm bore × 210 mm OD × 28 mm width (5.906 × 8.268 × 1.102 in), mass about 3050 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61930 work?", "a": "The final two digits of 61930 are bore code 30, multiplied by 5 to give 150 mm." }, { "q": "How long can a greased 61930-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 61930-MA take?", "a": "Catalogue values for 61930 MA: dynamic C 88.4 kN, static C0 93 kN, fatigue limit Pu 2.9 kN. Use C in life calculation and C0 for static checks at 150 mm bore." }, { "q": "What is the speed rating of 61930-MA?", "a": "SKF lists a 6300 r/min thermal reference speed and a 5300 r/min mechanical limiting speed for 61930 MA; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "61930-2RS", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6930DDU on the same 150×210×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61930-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6930ZZ on the same 150×210×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61930", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6930 on the same 150×210×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61930-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6930 on the same 150×210×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61930-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6930LLU on the same 150×210×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61930-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6930ZZ on the same 150×210×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "61930-MA", "61930 MA" ], "locale_variants": {} }, { "sku": "6030-M", "brand": "SKF", "manufacturer_designation": "6030 M", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 4900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6030 carries code 30 = 150 mm (code × 5). The envelope is 150×225×35 mm (5.906×8.858×1.378 in) with a 37.5 mm radial section height, C 125 kN, C0 125 kN and Pu 3.9 kN. The open 6030 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5000 r/min, catalogue mass 4900 g.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "large industrial gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Fillet radii must clear the 6030-M chamfer so the 35 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 225 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6030-M.", "The M suffix on 6030-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 4900 g quoted mass includes the heavier cage.", "Open 6030-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6030-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 3.9 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 6030 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 6030 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6030-M?", "a": "The SKF 6030 M measures 150 mm bore × 225 mm OD × 35 mm width (5.906 × 8.858 × 1.378 in), mass about 4900 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6030 work?", "a": "The final two digits of 6030 are bore code 30, multiplied by 5 to give 150 mm." }, { "q": "How heavy is 6030-M?", "a": "Catalogue mass is 4900 g for 6030 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6030-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6030-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6030", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6030 (open arrangement) shares the 150×225×35 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6030-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6030-2RS1 (two contact elastomer seals) shares the 150×225×35 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6030-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6030-2Z (two non-contact shields) shares the 150×225×35 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6030 on the same 150×225×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6030-2RSR on the same 150×225×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6030-2Z on the same 150×225×35 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6030DDU on the same 150×225×35 mm envelope, but catalogue C/C0 differ (125/125 kN vs 138/126 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6030VV on the same 150×225×35 mm envelope, but catalogue C/C0 differ (125/125 kN vs 138/126 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6030ZZ on the same 150×225×35 mm envelope, but catalogue C/C0 differ (125/125 kN vs 138/126 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6030 on the same 150×225×35 mm envelope, but catalogue C/C0 differ (125/125 kN vs 138/126 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6030-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6030 on the same 150×225×35 mm envelope, but catalogue C/C0 differ (125/125 kN vs 139/126 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6030-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6030LLU on the same 150×225×35 mm envelope, but catalogue C/C0 differ (125/125 kN vs 139/126 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6030-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6030ZZ on the same 150×225×35 mm envelope, but catalogue C/C0 differ (125/125 kN vs 139/126 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": [ "6030-M", "6030 M" ], "locale_variants": {} }, { "sku": "6230-M", "brand": "SKF", "manufacturer_designation": "6230 M", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 174, "static_load_kN": 166, "fatigue_load_limit_kN": 4.9, "reference_speed_rpm": 5000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6230 carries code 30 = 150 mm (code × 5). The envelope is 150×270×45 mm (5.906×10.63×1.772 in) with a 60.0 mm radial section height, C 174 kN, C0 166 kN and Pu 4.9 kN. The open 6230 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4500 r/min, catalogue mass 11500 g.", "applications": [ "crusher auxiliary drives", "large industrial gearboxes", "heavy conveyor drives", "hoists and winches" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 150 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 6230-M (C 174 kN, C0 166 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 M suffix on 6230-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 11500 g quoted mass includes the heavier cage.", "Open 6230-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6230-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 150 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.", "Where two 6230 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6230-M?", "a": "The SKF 6230 M measures 150 mm bore × 270 mm OD × 45 mm width (5.906 × 10.63 × 1.772 in), mass about 11500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6230 work?", "a": "The final two digits of 6230 are bore code 30, multiplied by 5 to give 150 mm." }, { "q": "What internal clearance does 6230-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6230-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6230-M take?", "a": "Catalogue values for 6230 M: dynamic C 174 kN, static C0 166 kN, fatigue limit Pu 4.9 kN. Use C in life calculation and C0 for static checks at 150 mm bore." } ], "cross_ref": [ { "equiv_sku": "6230", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6230 (open arrangement) shares the 150×270×45 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6230-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6230 on the same 150×270×45 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6230-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6230ZZ on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 194/168 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6230-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6230 on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 194/168 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6230-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6230 on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 195/168 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6230-2RS", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6230LLU on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 195/168 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6230-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6230ZZ on the same 150×270×45 mm envelope, but catalogue C/C0 differ (174/166 kN vs 195/168 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": [ "6230-M", "6230 M" ], "locale_variants": {} }, { "sku": "6330-M", "brand": "SKF", "manufacturer_designation": "6330 M", "series": "6300-series", "type": "deep_groove", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 276, "static_load_kN": 285, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 4300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 25500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6330 carries code 30 = 150 mm (code × 5). The envelope is 150×320×65 mm (5.906×12.598×2.559 in) with a 85.0 mm radial section height, C 276 kN, C0 285 kN and Pu 7.8 kN. The open 6330 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4000 r/min, catalogue mass 25500 g.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Do not preload 6330-M 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 6330-M chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6330-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 25500 g quoted mass includes the heavier cage.", "Open 6330-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6330-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6330-M (C 276 kN, C0 285 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.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6330-M?", "a": "The SKF 6330 M measures 150 mm bore × 320 mm OD × 65 mm width (5.906 × 12.598 × 2.559 in), mass about 25500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6330 work?", "a": "The final two digits of 6330 are bore code 30, multiplied by 5 to give 150 mm." }, { "q": "What internal clearance does 6330-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6330-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6330-M take?", "a": "Catalogue values for 6330 M: dynamic C 276 kN, static C0 285 kN, fatigue limit Pu 7.8 kN. Use C in life calculation and C0 for static checks at 150 mm bore." } ], "cross_ref": [ { "equiv_sku": "6330", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6330 (open arrangement) shares the 150×320×65 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6330-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6330ZZ on the same 150×320×65 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6330-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6330 on the same 150×320×65 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6330-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6330 on the same 150×320×65 mm envelope, but catalogue C/C0 differ (276/285 kN vs 305/284 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": [ "6330-M", "6330 M" ], "locale_variants": {} }, { "sku": "61932-MA", "brand": "SKF", "manufacturer_designation": "61932 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 92.3, "static_load_kN": 98, "fatigue_load_limit_kN": 3.05, "reference_speed_rpm": 6000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 3200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61932 carries code 32 = 160 mm (code × 5). The envelope is 160×220×28 mm (6.299×8.661×1.102 in) with a 30.0 mm radial section height, C 92.3 kN, C0 98 kN and Pu 3.05 kN. The open 61932 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 5000 r/min, catalogue mass 3200 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Do not preload 61932-MA 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 3.05 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 61932-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 3200 g quoted mass includes the heavier cage.", "Open 61932-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61932-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 61932-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 61932-MA?", "a": "The SKF 61932 MA measures 160 mm bore × 220 mm OD × 28 mm width (6.299 × 8.661 × 1.102 in), mass about 3200 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61932 work?", "a": "The final two digits of 61932 are bore code 32, multiplied by 5 to give 160 mm." }, { "q": "What load can 61932-MA take?", "a": "Catalogue values for 61932 MA: dynamic C 92.3 kN, static C0 98 kN, fatigue limit Pu 3.05 kN. Use C in life calculation and C0 for static checks at 160 mm bore." }, { "q": "What is the speed rating of 61932-MA?", "a": "SKF lists a 6000 r/min thermal reference speed and a 5000 r/min mechanical limiting speed for 61932 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61932-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61932-MA has a 30 mm radial section and C 92.3 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "61932", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61932 (open arrangement) shares the 160×220×28 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61932-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 61932 on the same 160×220×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61932-2RS", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6932DDU on the same 160×220×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61932-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6932ZZ on the same 160×220×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61932-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6932 on the same 160×220×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61932-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6932 on the same 160×220×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61932-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6932LLU on the same 160×220×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61932-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6932ZZ on the same 160×220×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "61932-MA", "61932 MA" ], "locale_variants": {} }, { "sku": "6032-M", "brand": "SKF", "manufacturer_designation": "6032 M", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 6000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6032 carries code 32 = 160 mm (code × 5). The envelope is 160×240×38 mm (6.299×9.449×1.496 in) with a 40.0 mm radial section height, C 143 kN, C0 143 kN and Pu 4.3 kN. The open 6032 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4800 r/min, catalogue mass 6000 g.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 160 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 6032-M home through the outer ring or balls brinells the raceways.", "The M suffix on 6032-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 6000 g quoted mass includes the heavier cage.", "Open 6032-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6032-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 6032-M home through the outer ring or balls brinells the raceways.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6032-M?", "a": "The SKF 6032 M measures 160 mm bore × 240 mm OD × 38 mm width (6.299 × 9.449 × 1.496 in), mass about 6000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6032 work?", "a": "The final two digits of 6032 are bore code 32, multiplied by 5 to give 160 mm." }, { "q": "How long can a greased 6032-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6032-M take?", "a": "Catalogue values for 6032 M: dynamic C 143 kN, static C0 143 kN, fatigue limit Pu 4.3 kN. Use C in life calculation and C0 for static checks at 160 mm bore." }, { "q": "What is the speed rating of 6032-M?", "a": "SKF lists a 5600 r/min thermal reference speed and a 4800 r/min mechanical limiting speed for 6032 M; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "6032", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6032 (open arrangement) shares the 160×240×38 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6032-2RS", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6032-2RS1 (two contact elastomer seals) shares the 160×240×38 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6032-ZZ", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6032-2Z (two non-contact shields) shares the 160×240×38 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6032 on the same 160×240×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6032-2RSR on the same 160×240×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6032-2Z on the same 160×240×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6032DDU on the same 160×240×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6032ZZ on the same 160×240×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6032 on the same 160×240×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6032-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6032 on the same 160×240×38 mm envelope, but catalogue C/C0 differ (143/143 kN vs 158/144 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6032-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6032LLU on the same 160×240×38 mm envelope, but catalogue C/C0 differ (143/143 kN vs 158/144 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6032-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6032ZZ on the same 160×240×38 mm envelope, but catalogue C/C0 differ (143/143 kN vs 158/144 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": [ "6032-M", "6032 M" ], "locale_variants": {} }, { "sku": "6232-M", "brand": "SKF", "manufacturer_designation": "6232 M", "series": "6200-series", "type": "deep_groove", "d_mm": 160, "D_mm": 290, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 186, "static_load_kN": 186, "fatigue_load_limit_kN": 5.3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6232 carries code 32 = 160 mm (code × 5). The envelope is 160×290×48 mm (6.299×11.417×1.89 in) with a 65.0 mm radial section height, C 186 kN, C0 186 kN and Pu 5.3 kN. The open 6232 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4300 r/min, catalogue mass 14000 g.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "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.", "Assign interference to the rotating ring: on a conventional shaft-mounted 160 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 M suffix on 6232-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 14000 g quoted mass includes the heavier cage.", "Open 6232-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6232-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6232-M (C 186 kN, C0 186 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.", "For positions that need relubrication, choose the open execution of 6232 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 6232 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6232-M?", "a": "The SKF 6232 M measures 160 mm bore × 290 mm OD × 48 mm width (6.299 × 11.417 × 1.89 in), mass about 14000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6232 work?", "a": "The final two digits of 6232 are bore code 32, multiplied by 5 to give 160 mm." }, { "q": "What internal clearance does 6232-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6232-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6232-M take?", "a": "Catalogue values for 6232 M: dynamic C 186 kN, static C0 186 kN, fatigue limit Pu 5.3 kN. Use C in life calculation and C0 for static checks at 160 mm bore." } ], "cross_ref": [ { "equiv_sku": "6232", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6232 (open arrangement) shares the 160×290×48 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6232-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6232ZZ on the same 160×290×48 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6232-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6232 on the same 160×290×48 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6232-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6232 on the same 160×290×48 mm envelope, but catalogue C/C0 differ (186/186 kN vs 205/186 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": [ "6232-M", "6232 M" ], "locale_variants": {} }, { "sku": "6332-M", "brand": "SKF", "manufacturer_designation": "6332 M", "series": "6300-series", "type": "deep_groove", "d_mm": 160, "D_mm": 340, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 276, "static_load_kN": 285, "fatigue_load_limit_kN": 7.65, "reference_speed_rpm": 4000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 30000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6332 carries code 32 = 160 mm (code × 5). The envelope is 160×340×68 mm (6.299×13.386×2.677 in) with a 90.0 mm radial section height, C 276 kN, C0 285 kN and Pu 7.65 kN. The open 6332 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3800 r/min, catalogue mass 30000 g.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 6332-M home through the outer ring or balls brinells the raceways.", "Assign interference to the rotating ring: on a conventional shaft-mounted 160 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 M suffix on 6332-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 30000 g quoted mass includes the heavier cage.", "Open 6332-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6332-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 7.65 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 6332 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 6332-M?", "a": "The SKF 6332 M measures 160 mm bore × 340 mm OD × 68 mm width (6.299 × 13.386 × 2.677 in), mass about 30000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6332 work?", "a": "The final two digits of 6332 are bore code 32, multiplied by 5 to give 160 mm." }, { "q": "How heavy is 6332-M?", "a": "Catalogue mass is 30000 g for 6332 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6332-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6332-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6332-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6332ZZ on the same 160×340×68 mm envelope, but catalogue C/C0 differ (276/285 kN vs 305/287 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6332", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6332 on the same 160×340×68 mm envelope, but catalogue C/C0 differ (276/285 kN vs 305/287 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6332-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6332 on the same 160×340×68 mm envelope, but catalogue C/C0 differ (276/285 kN vs 310/286 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": [ "6332-M", "6332 M" ], "locale_variants": {} }, { "sku": "61934-MA", "brand": "SKF", "manufacturer_designation": "61934 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 170, "D_mm": 230, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 93.6, "static_load_kN": 106, "fatigue_load_limit_kN": 3.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61934 carries code 34 = 170 mm (code × 5). The envelope is 170×230×28 mm (6.693×9.055×1.102 in) with a 30.0 mm radial section height, C 93.6 kN, C0 106 kN and Pu 3.15 kN. The open 61934 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4800 r/min, catalogue mass 3350 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "At 170 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.", "Catalogue ratings for 61934-MA (C 93.6 kN, C0 106 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 MA suffix on 61934-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 3350 g quoted mass includes the heavier cage.", "Open 61934-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61934-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 170 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.", "A replacement 61934 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 61934-MA?", "a": "The SKF 61934 MA measures 170 mm bore × 230 mm OD × 28 mm width (6.693 × 9.055 × 1.102 in), mass about 3350 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61934 work?", "a": "The final two digits of 61934 are bore code 34, multiplied by 5 to give 170 mm." }, { "q": "How heavy is 61934-MA?", "a": "Catalogue mass is 3350 g for 61934 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 61934-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 61934-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "61934-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 61934 on the same 170×230×28 mm envelope, but catalogue C/C0 differ (93.6/106 kN vs 109/114 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61934-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6934ZZ on the same 170×230×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61934", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6934 on the same 170×230×28 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61934-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6934 on the same 170×230×28 mm envelope, but catalogue C/C0 differ (93.6/106 kN vs 95/95.5 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61934-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6934ZZ on the same 170×230×28 mm envelope, but catalogue C/C0 differ (93.6/106 kN vs 95/95.5 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": [ "61934-MA", "61934 MA" ], "locale_variants": {} }, { "sku": "6034-M", "brand": "SKF", "manufacturer_designation": "6034 M", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 168, "static_load_kN": 173, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 5300, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 8150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6034 carries code 34 = 170 mm (code × 5). The envelope is 170×260×42 mm (6.693×10.236×1.654 in) with a 45.0 mm radial section height, C 168 kN, C0 173 kN and Pu 5 kN. The open 6034 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4300 r/min, catalogue mass 8150 g.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 170 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 6034-M chamfer so the 42 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6034-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 8150 g quoted mass includes the heavier cage.", "Open 6034-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6034-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6034-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 6034 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6034-M?", "a": "The SKF 6034 M measures 170 mm bore × 260 mm OD × 42 mm width (6.693 × 10.236 × 1.654 in), mass about 8150 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6034 work?", "a": "The final two digits of 6034 are bore code 34, multiplied by 5 to give 170 mm." }, { "q": "How heavy is 6034-M?", "a": "Catalogue mass is 8150 g for 6034 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6034-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6034-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6034", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6034 (open arrangement) shares the 170×260×42 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6034-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6034 on the same 170×260×42 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6034-2RS", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 6034-2RSR on the same 170×260×42 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6034-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6034VV on the same 170×260×42 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6034-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6034ZZ on the same 170×260×42 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6034-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6034 on the same 170×260×42 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6034-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6034 on the same 170×260×42 mm envelope, but catalogue C/C0 differ (168/173 kN vs 187/172 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6034-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6034ZZ on the same 170×260×42 mm envelope, but catalogue C/C0 differ (168/173 kN vs 187/172 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": [ "6034-M", "6034 M" ], "locale_variants": {} }, { "sku": "6234-M", "brand": "SKF", "manufacturer_designation": "6234 M", "series": "6200-series", "type": "deep_groove", "d_mm": 170, "D_mm": 310, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 212, "static_load_kN": 224, "fatigue_load_limit_kN": 6.1, "reference_speed_rpm": 4300, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6234 carries code 34 = 170 mm (code × 5). The envelope is 170×310×52 mm (6.693×12.205×2.047 in) with a 70.0 mm radial section height, C 212 kN, C0 224 kN and Pu 6.1 kN. The open 6234 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3800 r/min, catalogue mass 17500 g.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 310 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6234-M.", "Deep-groove geometry tolerates only minutes of misalignment; if the 310 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6234-M.", "The M suffix on 6234-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 17500 g quoted mass includes the heavier cage.", "Open 6234-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6234-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6234-M (C 212 kN, C0 224 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.", "For positions that need relubrication, choose the open execution of 6234 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 6234 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6234-M?", "a": "The SKF 6234 M measures 170 mm bore × 310 mm OD × 52 mm width (6.693 × 12.205 × 2.047 in), mass about 17500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6234 work?", "a": "The final two digits of 6234 are bore code 34, multiplied by 5 to give 170 mm." }, { "q": "What is the speed rating of 6234-M?", "a": "SKF lists a 4300 r/min thermal reference speed and a 3800 r/min mechanical limiting speed for 6234 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6234-M and a same-bore 62-series bearing?", "a": "Section height differs: 6234-M has a 70 mm radial section and C 212 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6234-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 310 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "6234", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6234 (open arrangement) shares the 170×310×52 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6234-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6234ZZ on the same 170×310×52 mm envelope, but catalogue C/C0 differ (212/224 kN vs 234/224 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6234-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6234 on the same 170×310×52 mm envelope, but catalogue C/C0 differ (212/224 kN vs 234/224 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6234-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6234 on the same 170×310×52 mm envelope, but catalogue C/C0 differ (212/224 kN vs 235/223 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": [ "6234-M", "6234 M" ], "locale_variants": {} }, { "sku": "6334-M", "brand": "SKF", "manufacturer_designation": "6334 M", "series": "6300-series", "type": "deep_groove", "d_mm": 170, "D_mm": 360, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 312, "static_load_kN": 340, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3800, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 35000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6334 carries code 34 = 170 mm (code × 5). The envelope is 170×360×72 mm (6.693×14.173×2.835 in) with a 95.0 mm radial section height, C 312 kN, C0 340 kN and Pu 8.8 kN. The open 6334 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3400 r/min, catalogue mass 35000 g.", "applications": [ "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Do not preload 6334-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6334-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The M suffix on 6334-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 35000 g quoted mass includes the heavier cage.", "Open 6334-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6334-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 360 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6334-M.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6334-M?", "a": "The SKF 6334 M measures 170 mm bore × 360 mm OD × 72 mm width (6.693 × 14.173 × 2.835 in), mass about 35000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6334 work?", "a": "The final two digits of 6334 are bore code 34, multiplied by 5 to give 170 mm." }, { "q": "What is the difference between 6334-M and a same-bore 62-series bearing?", "a": "Section height differs: 6334-M has a 95 mm radial section and C 312 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6334-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 360 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6334-M?", "a": "Catalogue mass is 35000 g for 6334 M; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "6334", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6334 (open arrangement) shares the 170×360×72 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6334-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6334 on the same 170×360×72 mm envelope, but catalogue C/C0 differ (312/340 kN vs 360/355 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6334-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6334 on the same 170×360×72 mm envelope, but catalogue C/C0 differ (312/340 kN vs 360/355 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": [ "6334-M", "6334 M" ], "locale_variants": {} }, { "sku": "61936-MA", "brand": "SKF", "manufacturer_designation": "61936 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 180, "D_mm": 250, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 119, "static_load_kN": 134, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 5300, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 5000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61936 carries code 36 = 180 mm (code × 5). The envelope is 180×250×33 mm (7.087×9.843×1.299 in) with a 35.0 mm radial section height, C 119 kN, C0 134 kN and Pu 3.9 kN. The open 61936 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4300 r/min, catalogue mass 5000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Do not preload 61936-MA 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 61936-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The MA suffix on 61936-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 5000 g quoted mass includes the heavier cage.", "Open 61936-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61936-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 61936-MA chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 61936-MA?", "a": "The SKF 61936 MA measures 180 mm bore × 250 mm OD × 33 mm width (7.087 × 9.843 × 1.299 in), mass about 5000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61936 work?", "a": "The final two digits of 61936 are bore code 36, multiplied by 5 to give 180 mm." }, { "q": "What is the difference between 61936-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61936-MA has a 35 mm radial section and C 119 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61936-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 250 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61936-MA?", "a": "Catalogue mass is 5000 g for 61936 MA; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "61936", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61936 (open arrangement) shares the 180×250×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61936-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 61936 on the same 180×250×33 mm envelope, but catalogue C/C0 differ (119/134 kN vs 131/136 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61936-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6936ZZ on the same 180×250×33 mm envelope, but catalogue C/C0 differ (119/134 kN vs 131/128 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61936-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6936 on the same 180×250×33 mm envelope, but catalogue C/C0 differ (119/134 kN vs 131/128 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61936-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6936 on the same 180×250×33 mm envelope, but catalogue C/C0 differ (119/134 kN vs 122/119 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": [ "61936-MA", "61936 MA" ], "locale_variants": {} }, { "sku": "6036-M", "brand": "SKF", "manufacturer_designation": "6036 M", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 190, "static_load_kN": 200, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 4800, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6036 carries code 36 = 180 mm (code × 5). The envelope is 180×280×46 mm (7.087×11.024×1.811 in) with a 50.0 mm radial section height, C 190 kN, C0 200 kN and Pu 5.6 kN. The open 6036 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4000 r/min, catalogue mass 10500 g.", "applications": [ "crusher auxiliary drives", "large industrial gearboxes", "heavy conveyor drives", "hoists and winches" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Catalogue ratings for 6036-M (C 190 kN, C0 200 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 180 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 M suffix on 6036-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 10500 g quoted mass includes the heavier cage.", "Open 6036-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6036-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 5.6 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 6036 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 6036 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6036-M?", "a": "The SKF 6036 M measures 180 mm bore × 280 mm OD × 46 mm width (7.087 × 11.024 × 1.811 in), mass about 10500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6036 work?", "a": "The final two digits of 6036 are bore code 36, multiplied by 5 to give 180 mm." }, { "q": "Which fits should I use for 6036-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 280 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6036-M?", "a": "Catalogue mass is 10500 g for 6036 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6036-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "6036", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6036 (open arrangement) shares the 180×280×46 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6036-RSR", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6036VV on the same 180×280×46 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6036-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6036ZZ on the same 180×280×46 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6036-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6036 on the same 180×280×46 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6036-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6036 on the same 180×280×46 mm envelope, but catalogue C/C0 differ (190/200 kN vs 210/199 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": [ "6036-M", "6036 M" ], "locale_variants": {} }, { "sku": "6236-M", "brand": "SKF", "manufacturer_designation": "6236 M", "series": "6200-series", "type": "deep_groove", "d_mm": 180, "D_mm": 320, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 229, "static_load_kN": 240, "fatigue_load_limit_kN": 6.4, "reference_speed_rpm": 4000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6236 carries code 36 = 180 mm (code × 5). The envelope is 180×320×52 mm (7.087×12.598×2.047 in) with a 70.0 mm radial section height, C 229 kN, C0 240 kN and Pu 6.4 kN. The open 6236 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3800 r/min, catalogue mass 18000 g.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "large industrial gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Do not preload 6236-M 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 6236-M (C 229 kN, C0 240 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 M suffix on 6236-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 18000 g quoted mass includes the heavier cage.", "Open 6236-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6236-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 320 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6236-M.", "Where two 6236 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 6236 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6236-M?", "a": "The SKF 6236 M measures 180 mm bore × 320 mm OD × 52 mm width (7.087 × 12.598 × 2.047 in), mass about 18000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6236 work?", "a": "The final two digits of 6236 are bore code 36, multiplied by 5 to give 180 mm." }, { "q": "What is the difference between 6236-M and a same-bore 62-series bearing?", "a": "Section height differs: 6236-M has a 70 mm radial section and C 229 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6236-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 320 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6236-M?", "a": "Catalogue mass is 18000 g for 6236 M; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "6236", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6236 (open arrangement) shares the 180×320×52 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6236-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6236ZZ on the same 180×320×52 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6236-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6236 on the same 180×320×52 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6236-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6236 on the same 180×320×52 mm envelope, but catalogue C/C0 differ (229/240 kN vs 252/241 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": [ "6236-M", "6236 M" ], "locale_variants": {} }, { "sku": "6336-M", "brand": "SKF", "manufacturer_designation": "6336 M", "series": "6300-series", "type": "deep_groove", "d_mm": 180, "D_mm": 380, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 351, "static_load_kN": 405, "fatigue_load_limit_kN": 10.4, "reference_speed_rpm": 3600, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 41000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6336 carries code 36 = 180 mm (code × 5). The envelope is 180×380×75 mm (7.087×14.961×2.953 in) with a 100.0 mm radial section height, C 351 kN, C0 405 kN and Pu 10.4 kN. The open 6336 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3200 r/min, catalogue mass 41000 g.", "applications": [ "marine deck machinery", "crusher auxiliary drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "The fatigue load limit is 10.4 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Catalogue ratings for 6336-M (C 351 kN, C0 405 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 M suffix on 6336-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 41000 g quoted mass includes the heavier cage.", "Open 6336-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6336-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 180 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.", "A replacement 6336 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6336-M?", "a": "The SKF 6336 M measures 180 mm bore × 380 mm OD × 75 mm width (7.087 × 14.961 × 2.953 in), mass about 41000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6336 work?", "a": "The final two digits of 6336 are bore code 36, multiplied by 5 to give 180 mm." }, { "q": "Which fits should I use for 6336-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 380 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6336-M?", "a": "Catalogue mass is 41000 g for 6336 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6336-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "6336", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6336 (open arrangement) shares the 180×380×75 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6336-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6336 on the same 180×380×75 mm envelope, but catalogue C/C0 differ (351/405 kN vs 390/405 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6336-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6336 on the same 180×380×75 mm envelope, but catalogue C/C0 differ (351/405 kN vs 390/405 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": [ "6336-M", "6336 M" ], "locale_variants": {} }, { "sku": "61938-MA", "brand": "SKF", "manufacturer_designation": "61938 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 190, "D_mm": 260, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 117, "static_load_kN": 134, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 5000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 5200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61938 carries code 38 = 190 mm (code × 5). The envelope is 190×260×33 mm (7.48×10.236×1.299 in) with a 35.0 mm radial section height, C 117 kN, C0 134 kN and Pu 3.8 kN. The open 61938 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 4300 r/min, catalogue mass 5200 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Catalogue ratings for 61938-MA (C 117 kN, C0 134 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 190 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.", "The MA suffix on 61938-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 5200 g quoted mass includes the heavier cage.", "Open 61938-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61938-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 61938-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 61938-MA?", "a": "The SKF 61938 MA measures 190 mm bore × 260 mm OD × 33 mm width (7.48 × 10.236 × 1.299 in), mass about 5200 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61938 work?", "a": "The final two digits of 61938 are bore code 38, multiplied by 5 to give 190 mm." }, { "q": "What internal clearance does 61938-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 61938-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 61938-MA take?", "a": "Catalogue values for 61938 MA: dynamic C 117 kN, static C0 134 kN, fatigue limit Pu 3.8 kN. Use C in life calculation and C0 for static checks at 190 mm bore." } ], "cross_ref": [ { "equiv_sku": "61938", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61938 (open arrangement) shares the 190×260×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61938-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 61938 on the same 190×260×33 mm envelope, but catalogue C/C0 differ (117/134 kN vs 140/146 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61938-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6938 on the same 190×260×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61938-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6938 on the same 190×260×33 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "61938-MA", "61938 MA" ], "locale_variants": {} }, { "sku": "6038-M", "brand": "SKF", "manufacturer_designation": "6038 M", "series": "6000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 195, "static_load_kN": 216, "fatigue_load_limit_kN": 5.85, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6038 carries code 38 = 190 mm (code × 5). The envelope is 190×290×46 mm (7.48×11.417×1.811 in) with a 50.0 mm radial section height, C 195 kN, C0 216 kN and Pu 5.85 kN. The open 6038 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3800 r/min, catalogue mass 11000 g.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "large industrial gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 190 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 190 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.", "The M suffix on 6038-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 11000 g quoted mass includes the heavier cage.", "Open 6038-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6038-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 6038-M chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 6038 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6038-M?", "a": "The SKF 6038 M measures 190 mm bore × 290 mm OD × 46 mm width (7.48 × 11.417 × 1.811 in), mass about 11000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6038 work?", "a": "The final two digits of 6038 are bore code 38, multiplied by 5 to give 190 mm." }, { "q": "What load can 6038-M take?", "a": "Catalogue values for 6038 M: dynamic C 195 kN, static C0 216 kN, fatigue limit Pu 5.85 kN. Use C in life calculation and C0 for static checks at 190 mm bore." }, { "q": "What is the speed rating of 6038-M?", "a": "SKF lists a 4800 r/min thermal reference speed and a 3800 r/min mechanical limiting speed for 6038 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6038-M and a same-bore 62-series bearing?", "a": "Section height differs: 6038-M has a 50 mm radial section and C 195 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "6038", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6038 (open arrangement) shares the 190×290×46 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6038-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6038ZZ on the same 190×290×46 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6038-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6038 on the same 190×290×46 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6038-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6038 on the same 190×290×46 mm envelope, but catalogue C/C0 differ (195/216 kN vs 218/215 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": [ "6038-M", "6038 M" ], "locale_variants": {} }, { "sku": "6238-M", "brand": "SKF", "manufacturer_designation": "6238 M", "series": "6200-series", "type": "deep_groove", "d_mm": 190, "D_mm": 340, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 255, "static_load_kN": 280, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 3800, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 21500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6238 carries code 38 = 190 mm (code × 5). The envelope is 190×340×55 mm (7.48×13.386×2.165 in) with a 75.0 mm radial section height, C 255 kN, C0 280 kN and Pu 7.35 kN. The open 6238 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3400 r/min, catalogue mass 21500 g.", "applications": [ "crusher auxiliary drives", "large industrial gearboxes", "heavy conveyor drives", "hoists and winches" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 340 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6238-M.", "Do not preload 6238-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6238-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 21500 g quoted mass includes the heavier cage.", "Open 6238-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6238-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 6238-M home through the outer ring or balls brinells the raceways.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 6238 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6238-M?", "a": "The SKF 6238 M measures 190 mm bore × 340 mm OD × 55 mm width (7.48 × 13.386 × 2.165 in), mass about 21500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6238 work?", "a": "The final two digits of 6238 are bore code 38, multiplied by 5 to give 190 mm." }, { "q": "Which fits should I use for 6238-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 340 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6238-M?", "a": "Catalogue mass is 21500 g for 6238 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6238-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "6238", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6238 (open arrangement) shares the 190×340×55 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6238-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6238ZZ on the same 190×340×55 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6238-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6238 on the same 190×340×55 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6238-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6238 on the same 190×340×55 mm envelope, but catalogue C/C0 differ (255/280 kN vs 282/281 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": [ "6238-M", "6238 M" ], "locale_variants": {} }, { "sku": "6338-M", "brand": "SKF", "manufacturer_designation": "6338 M", "series": "6300-series", "type": "deep_groove", "d_mm": 190, "D_mm": 400, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 371, "static_load_kN": 430, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 3400, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 47500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6338 carries code 38 = 190 mm (code × 5). The envelope is 190×400×78 mm (7.48×15.748×3.071 in) with a 105.0 mm radial section height, C 371 kN, C0 430 kN and Pu 10.8 kN. The open 6338 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3000 r/min, catalogue mass 47500 g.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Do not preload 6338-M 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 6338-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6338-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 47500 g quoted mass includes the heavier cage.", "Open 6338-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6338-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 6338-M (C 371 kN, C0 430 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.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6338-M?", "a": "The SKF 6338 M measures 190 mm bore × 400 mm OD × 78 mm width (7.48 × 15.748 × 3.071 in), mass about 47500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6338 work?", "a": "The final two digits of 6338 are bore code 38, multiplied by 5 to give 190 mm." }, { "q": "How heavy is 6338-M?", "a": "Catalogue mass is 47500 g for 6338 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6338-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6338-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6338", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6338 (open arrangement) shares the 190×400×78 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6338-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6338 on the same 190×400×78 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6338-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6338 on the same 190×400×78 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6338-M", "6338 M" ], "locale_variants": {} }, { "sku": "61940-MA", "brand": "SKF", "manufacturer_designation": "61940 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 200, "D_mm": 280, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 148, "static_load_kN": 166, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 7300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61940 carries code 40 = 200 mm (code × 5). The envelope is 200×280×38 mm (7.874×11.024×1.496 in) with a 40.0 mm radial section height, C 148 kN, C0 166 kN and Pu 4.55 kN. The open 61940 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3800 r/min, catalogue mass 7300 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The fatigue load limit is 4.55 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 280 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61940-MA.", "The MA suffix on 61940-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 7300 g quoted mass includes the heavier cage.", "Open 61940-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61940-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 200 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 61940 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61940-MA?", "a": "The SKF 61940 MA measures 200 mm bore × 280 mm OD × 38 mm width (7.874 × 11.024 × 1.496 in), mass about 7300 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61940 work?", "a": "The final two digits of 61940 are bore code 40, multiplied by 5 to give 200 mm." }, { "q": "What load can 61940-MA take?", "a": "Catalogue values for 61940 MA: dynamic C 148 kN, static C0 166 kN, fatigue limit Pu 4.55 kN. Use C in life calculation and C0 for static checks at 200 mm bore." }, { "q": "What is the speed rating of 61940-MA?", "a": "SKF lists a 4800 r/min thermal reference speed and a 3800 r/min mechanical limiting speed for 61940 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61940-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61940-MA has a 40 mm radial section and C 148 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "61940", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61940 (open arrangement) shares the 200×280×38 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61940-FAG", "equiv_brand": "FAG", "level": "full", "note": "FAG counterpart FAG 61940 on the same 200×280×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61940-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6940ZZ on the same 200×280×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61940-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6940 on the same 200×280×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61940-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6940 on the same 200×280×38 mm envelope, but catalogue C/C0 differ (148/166 kN vs 174/168 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": [ "61940-MA", "61940 MA" ], "locale_variants": {} }, { "sku": "6040-M", "brand": "SKF", "manufacturer_designation": "6040 M", "series": "6000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 216, "static_load_kN": 245, "fatigue_load_limit_kN": 6.4, "reference_speed_rpm": 4300, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6040 carries code 40 = 200 mm (code × 5). The envelope is 200×310×51 mm (7.874×12.205×2.008 in) with a 55.0 mm radial section height, C 216 kN, C0 245 kN and Pu 6.4 kN. The open 6040 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3600 r/min, catalogue mass 14000 g.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 6040-M home through the outer ring or balls brinells the raceways.", "Fillet radii must clear the 6040-M chamfer so the 51 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6040-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 14000 g quoted mass includes the heavier cage.", "Open 6040-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6040-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 6.4 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 6040 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 6040-M?", "a": "The SKF 6040 M measures 200 mm bore × 310 mm OD × 51 mm width (7.874 × 12.205 × 2.008 in), mass about 14000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6040 work?", "a": "The final two digits of 6040 are bore code 40, multiplied by 5 to give 200 mm." }, { "q": "What internal clearance does 6040-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6040-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6040-M take?", "a": "Catalogue values for 6040 M: dynamic C 216 kN, static C0 245 kN, fatigue limit Pu 6.4 kN. Use C in life calculation and C0 for static checks at 200 mm bore." } ], "cross_ref": [ { "equiv_sku": "6040-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6040ZZ on the same 200×310×51 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6040", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6040 on the same 200×310×51 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6040-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6040 on the same 200×310×51 mm envelope, but catalogue C/C0 differ (216/245 kN vs 241/243 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": [ "6040-M", "6040 M" ], "locale_variants": {} }, { "sku": "6240-M", "brand": "SKF", "manufacturer_designation": "6240 M", "series": "6200-series", "type": "deep_groove", "d_mm": 200, "D_mm": 360, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 270, "static_load_kN": 310, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 26000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6240 carries code 40 = 200 mm (code × 5). The envelope is 200×360×58 mm (7.874×14.173×2.283 in) with a 80.0 mm radial section height, C 270 kN, C0 310 kN and Pu 7.8 kN. The open 6240 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3200 r/min, catalogue mass 26000 g.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Catalogue ratings for 6240-M (C 270 kN, C0 310 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.", "Mount by heating the inner ring (max 120 °C) — driving 6240-M home through the outer ring or balls brinells the raceways.", "The M suffix on 6240-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 26000 g quoted mass includes the heavier cage.", "Open 6240-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6240-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 6240-M chamfer so the 58 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6240-M?", "a": "The SKF 6240 M measures 200 mm bore × 360 mm OD × 58 mm width (7.874 × 14.173 × 2.283 in), mass about 26000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6240 work?", "a": "The final two digits of 6240 are bore code 40, multiplied by 5 to give 200 mm." }, { "q": "How long can a greased 6240-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6240-M take?", "a": "Catalogue values for 6240 M: dynamic C 270 kN, static C0 310 kN, fatigue limit Pu 7.8 kN. Use C in life calculation and C0 for static checks at 200 mm bore." }, { "q": "What is the speed rating of 6240-M?", "a": "SKF lists a 3600 r/min thermal reference speed and a 3200 r/min mechanical limiting speed for 6240 M; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "6240", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6240 (open arrangement) shares the 200×360×58 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6240-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6240ZZ on the same 200×360×58 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6240-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6240 on the same 200×360×58 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6240-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6240 on the same 200×360×58 mm envelope, but catalogue C/C0 differ (270/310 kN vs 298/310 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": [ "6240-M", "6240 M" ], "locale_variants": {} }, { "sku": "61944-MA", "brand": "SKF", "manufacturer_designation": "61944 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 220, "D_mm": 300, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 151, "static_load_kN": 180, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 4300, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 7950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61944 carries code 44 = 220 mm (code × 5). The envelope is 220×300×38 mm (8.661×11.811×1.496 in) with a 40.0 mm radial section height, C 151 kN, C0 180 kN and Pu 4.75 kN. The open 61944 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3600 r/min, catalogue mass 7950 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 220 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 220 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 MA suffix on 61944-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 7950 g quoted mass includes the heavier cage.", "Open 61944-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61944-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 61944-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 61944 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 61944-MA?", "a": "The SKF 61944 MA measures 220 mm bore × 300 mm OD × 38 mm width (8.661 × 11.811 × 1.496 in), mass about 7950 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61944 work?", "a": "The final two digits of 61944 are bore code 44, multiplied by 5 to give 220 mm." }, { "q": "Which fits should I use for 61944-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 300 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61944-MA?", "a": "Catalogue mass is 7950 g for 61944 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 61944-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "61944", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61944 (open arrangement) shares the 220×300×38 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61944-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 61944 on the same 220×300×38 mm envelope, but catalogue C/C0 differ (151/180 kN vs 186/202 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61944-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6944ZZ on the same 220×300×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61944-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6944 on the same 220×300×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61944-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6944 on the same 220×300×38 mm envelope, but catalogue C/C0 differ (151/180 kN vs 178/180 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": [ "61944-MA", "61944 MA" ], "locale_variants": {} }, { "sku": "6044-M", "brand": "SKF", "manufacturer_designation": "6044 M", "series": "6000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 247, "static_load_kN": 290, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 4000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6044 carries code 44 = 220 mm (code × 5). The envelope is 220×340×56 mm (8.661×13.386×2.205 in) with a 60.0 mm radial section height, C 247 kN, C0 290 kN and Pu 7.35 kN. The open 6044 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3200 r/min, catalogue mass 18500 g.", "applications": [ "marine deck machinery", "crusher auxiliary drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Do not preload 6044-M 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 6044-M chamfer so the 56 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6044-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 18500 g quoted mass includes the heavier cage.", "Open 6044-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6044-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 6044-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6044-M?", "a": "The SKF 6044 M measures 220 mm bore × 340 mm OD × 56 mm width (8.661 × 13.386 × 2.205 in), mass about 18500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6044 work?", "a": "The final two digits of 6044 are bore code 44, multiplied by 5 to give 220 mm." }, { "q": "How heavy is 6044-M?", "a": "Catalogue mass is 18500 g for 6044 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6044-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6044-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6044", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6044 (open arrangement) shares the 220×340×56 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6044-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6044ZZ on the same 220×340×56 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6044-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6044 on the same 220×340×56 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6044-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6044 on the same 220×340×56 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6044-M", "6044 M" ], "locale_variants": {} }, { "sku": "6244-M", "brand": "SKF", "manufacturer_designation": "6244 M", "series": "6200-series", "type": "deep_groove", "d_mm": 220, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 296, "static_load_kN": 365, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 36500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6244 carries code 44 = 220 mm (code × 5). The envelope is 220×400×65 mm (8.661×15.748×2.559 in) with a 90.0 mm radial section height, C 296 kN, C0 365 kN and Pu 8.8 kN. The open 6244 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3000 r/min, catalogue mass 36500 g.", "applications": [ "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Fillet radii must clear the 6244-M chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload 6244-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6244-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 36500 g quoted mass includes the heavier cage.", "Open 6244-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6244-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 220 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.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6244-M?", "a": "The SKF 6244 M measures 220 mm bore × 400 mm OD × 65 mm width (8.661 × 15.748 × 2.559 in), mass about 36500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6244 work?", "a": "The final two digits of 6244 are bore code 44, multiplied by 5 to give 220 mm." }, { "q": "What is the difference between 6244-M and a same-bore 62-series bearing?", "a": "Section height differs: 6244-M has a 90 mm radial section and C 296 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6244-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 400 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6244-M?", "a": "Catalogue mass is 36500 g for 6244 M; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "6244", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6244 (open arrangement) shares the 220×400×65 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6244-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6244 on the same 220×400×65 mm envelope, but catalogue C/C0 differ (296/365 kN vs 340/375 kN) — envelope interchange only after a load check." }, { "equiv_sku": "6244-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6244 on the same 220×400×65 mm envelope, but catalogue C/C0 differ (296/365 kN vs 330/365 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": [ "6244-M", "6244 M" ], "locale_variants": {} }, { "sku": "6344-M", "brand": "SKF", "manufacturer_designation": "6344 M", "series": "6300-series", "type": "deep_groove", "d_mm": 220, "D_mm": 460, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 410, "static_load_kN": 520, "fatigue_load_limit_kN": 12, "reference_speed_rpm": 3000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 73000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6344 carries code 44 = 220 mm (code × 5). The envelope is 220×460×88 mm (8.661×18.11×3.465 in) with a 120.0 mm radial section height, C 410 kN, C0 520 kN and Pu 12 kN. The open 6344 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2600 r/min, catalogue mass 73000 g.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The fatigue load limit is 12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6344-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The M suffix on 6344-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 73000 g quoted mass includes the heavier cage.", "Open 6344-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6344-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 220 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.", "Where two 6344 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6344-M?", "a": "The SKF 6344 M measures 220 mm bore × 460 mm OD × 88 mm width (8.661 × 18.11 × 3.465 in), mass about 73000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6344 work?", "a": "The final two digits of 6344 are bore code 44, multiplied by 5 to give 220 mm." }, { "q": "What is the difference between 6344-M and a same-bore 62-series bearing?", "a": "Section height differs: 6344-M has a 120 mm radial section and C 410 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6344-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 460 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6344-M?", "a": "Catalogue mass is 73000 g for 6344 M; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "6344", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6344 on the same 220×460×88 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6344-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6344 on the same 220×460×88 mm envelope, but catalogue C/C0 differ (410/520 kN vs 455/520 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": [ "6344-M", "6344 M" ], "locale_variants": {} }, { "sku": "61948-MA", "brand": "SKF", "manufacturer_designation": "61948 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 240, "D_mm": 320, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 159, "static_load_kN": 200, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 4000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 8550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61948 carries code 48 = 240 mm (code × 5). The envelope is 240×320×38 mm (9.449×12.598×1.496 in) with a 40.0 mm radial section height, C 159 kN, C0 200 kN and Pu 5.1 kN. The open 61948 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3200 r/min, catalogue mass 8550 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The fatigue load limit is 5.1 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "At 240 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.", "The MA suffix on 61948-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 8550 g quoted mass includes the heavier cage.", "Open 61948-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61948-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 240 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 61948 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61948-MA?", "a": "The SKF 61948 MA measures 240 mm bore × 320 mm OD × 38 mm width (9.449 × 12.598 × 1.496 in), mass about 8550 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61948 work?", "a": "The final two digits of 61948 are bore code 48, multiplied by 5 to give 240 mm." }, { "q": "What is the speed rating of 61948-MA?", "a": "SKF lists a 4000 r/min thermal reference speed and a 3200 r/min mechanical limiting speed for 61948 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61948-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61948-MA has a 40 mm radial section and C 159 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61948-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 320 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "61948", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61948 (open arrangement) shares the 240×320×38 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61948-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG bearing FAG 61948 on the same 240×320×38 mm envelope, but catalogue C/C0 differ (159/200 kN vs 211/240 kN) — envelope interchange only after a load check." }, { "equiv_sku": "61948-ZZ", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6948ZZ on the same 240×320×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61948-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6948 on the same 240×320×38 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "61948-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6948 on the same 240×320×38 mm envelope, but catalogue C/C0 differ (159/200 kN vs 188/203 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": [ "61948-MA", "61948 MA" ], "locale_variants": {} }, { "sku": "16048-MA", "brand": "SKF", "manufacturer_designation": "16048 MA", "series": "16000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 203, "static_load_kN": 255, "fatigue_load_limit_kN": 6.3, "reference_speed_rpm": 3600, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, the last two digits encode the bore: 16048 carries code 48 = 240 mm (code × 5). The envelope is 240×360×37 mm (9.449×14.173×1.457 in) with a 60.0 mm radial section height, C 203 kN, C0 255 kN and Pu 6.3 kN. The open 16048 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3000 r/min, catalogue mass 14000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 16048-MA home through the outer ring or balls brinells the raceways.", "Fillet radii must clear the 16048-MA chamfer so the 37 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MA suffix on 16048-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 14000 g quoted mass includes the heavier cage.", "Open 16048-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16048-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 240 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.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 16048 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 16048-MA?", "a": "The SKF 16048 MA measures 240 mm bore × 360 mm OD × 37 mm width (9.449 × 14.173 × 1.457 in), mass about 14000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16048 work?", "a": "The final two digits of 16048 are bore code 48, multiplied by 5 to give 240 mm." }, { "q": "How long can a greased 16048-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 16048-MA take?", "a": "Catalogue values for 16048 MA: dynamic C 203 kN, static C0 255 kN, fatigue limit Pu 6.3 kN. Use C in life calculation and C0 for static checks at 240 mm bore." }, { "q": "What is the speed rating of 16048-MA?", "a": "SKF lists a 3600 r/min thermal reference speed and a 3000 r/min mechanical limiting speed for 16048 MA; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "16048", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 16048 on the same 240×360×37 mm envelope, but catalogue C/C0 differ (203/255 kN vs 197/217 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": [ "16048-MA", "16048 MA" ], "locale_variants": {} }, { "sku": "6048-M", "brand": "SKF", "manufacturer_designation": "6048 M", "series": "6000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 255, "static_load_kN": 315, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 19500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6048 carries code 48 = 240 mm (code × 5). The envelope is 240×360×56 mm (9.449×14.173×2.205 in) with a 60.0 mm radial section height, C 255 kN, C0 315 kN and Pu 7.8 kN. The open 6048 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3000 r/min, catalogue mass 19500 g.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 240 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 7.8 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The M suffix on 6048-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 19500 g quoted mass includes the heavier cage.", "Open 6048-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6048-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 6048-M home through the outer ring or balls brinells the raceways.", "A replacement 6048 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 6048 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6048-M?", "a": "The SKF 6048 M measures 240 mm bore × 360 mm OD × 56 mm width (9.449 × 14.173 × 2.205 in), mass about 19500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6048 work?", "a": "The final two digits of 6048 are bore code 48, multiplied by 5 to give 240 mm." }, { "q": "What load can 6048-M take?", "a": "Catalogue values for 6048 M: dynamic C 255 kN, static C0 315 kN, fatigue limit Pu 7.8 kN. Use C in life calculation and C0 for static checks at 240 mm bore." }, { "q": "What is the speed rating of 6048-M?", "a": "SKF lists a 3600 r/min thermal reference speed and a 3000 r/min mechanical limiting speed for 6048 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6048-M and a same-bore 62-series bearing?", "a": "Section height differs: 6048-M has a 60 mm radial section and C 255 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "6048", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6048 (open arrangement) shares the 240×360×56 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6048-NSK", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6048 on the same 240×360×56 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." }, { "equiv_sku": "6048-NTN", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6048 on the same 240×360×56 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6048-M", "6048 M" ], "locale_variants": {} }, { "sku": "6248-M", "brand": "SKF", "manufacturer_designation": "6248 M", "series": "6200-series", "type": "deep_groove", "d_mm": 240, "D_mm": 440, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 358, "static_load_kN": 465, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 3000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 51000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6248 carries code 48 = 240 mm (code × 5). The envelope is 240×440×72 mm (9.449×17.323×2.835 in) with a 100.0 mm radial section height, C 358 kN, C0 465 kN and Pu 10.8 kN. The open 6248 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2600 r/min, catalogue mass 51000 g.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Catalogue ratings for 6248-M (C 358 kN, C0 465 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 6248-M (C 358 kN, C0 465 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 M suffix on 6248-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 51000 g quoted mass includes the heavier cage.", "Open 6248-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6248-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 440 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6248-M.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6248-M?", "a": "The SKF 6248 M measures 240 mm bore × 440 mm OD × 72 mm width (9.449 × 17.323 × 2.835 in), mass about 51000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6248 work?", "a": "The final two digits of 6248 are bore code 48, multiplied by 5 to give 240 mm." }, { "q": "Which fits should I use for 6248-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 440 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6248-M?", "a": "Catalogue mass is 51000 g for 6248 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6248-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "6248", "equiv_brand": "NSK", "level": "full", "note": "NSK counterpart NSK 6248 on the same 240×440×72 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6248-M", "6248 M" ], "locale_variants": {} }, { "sku": "6348-M", "brand": "SKF", "manufacturer_designation": "6348 M", "series": "6300-series", "type": "deep_groove", "d_mm": 240, "D_mm": 500, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 442, "static_load_kN": 585, "fatigue_load_limit_kN": 12.9, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 97000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series, the last two digits encode the bore: 6348 carries code 48 = 240 mm (code × 5). The envelope is 240×500×95 mm (9.449×19.685×3.74 in) with a 130.0 mm radial section height, C 442 kN, C0 585 kN and Pu 12.9 kN. The open 6348 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2400 r/min, catalogue mass 97000 g.", "applications": [ "crusher auxiliary drives", "large industrial gearboxes", "heavy conveyor drives", "hoists and winches" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 6348-M home through the outer ring or balls brinells the raceways.", "Do not preload 6348-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6348-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 97000 g quoted mass includes the heavier cage.", "Open 6348-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6348-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 240 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6348-M?", "a": "The SKF 6348 M measures 240 mm bore × 500 mm OD × 95 mm width (9.449 × 19.685 × 3.74 in), mass about 97000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6348 work?", "a": "The final two digits of 6348 are bore code 48, multiplied by 5 to give 240 mm." }, { "q": "What is the difference between 6348-M and a same-bore 62-series bearing?", "a": "Section height differs: 6348-M has a 130 mm radial section and C 442 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6348-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 500 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6348-M?", "a": "Catalogue mass is 97000 g for 6348 M; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "6348", "equiv_brand": "NSK", "level": "partial", "note": "NSK bearing NSK 6348 on the same 240×500×95 mm envelope, but catalogue C/C0 differ (442/585 kN vs 515/625 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": [ "6348-M", "6348 M" ], "locale_variants": {} }, { "sku": "61952-MA", "brand": "SKF", "manufacturer_designation": "61952 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 260, "D_mm": 360, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 212, "static_load_kN": 270, "fatigue_load_limit_kN": 6.55, "reference_speed_rpm": 3600, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61952 carries code 52 = 260 mm (code × 5). The envelope is 260×360×46 mm (10.236×14.173×1.811 in) with a 50.0 mm radial section height, C 212 kN, C0 270 kN and Pu 6.55 kN. The open 61952 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3000 r/min, catalogue mass 14500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 61952-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The fatigue load limit is 6.55 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 61952-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 14500 g quoted mass includes the heavier cage.", "Open 61952-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61952-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 260 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.", "A replacement 61952 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 61952 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61952-MA?", "a": "The SKF 61952 MA measures 260 mm bore × 360 mm OD × 46 mm width (10.236 × 14.173 × 1.811 in), mass about 14500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61952 work?", "a": "The final two digits of 61952 are bore code 52, multiplied by 5 to give 260 mm." }, { "q": "Which fits should I use for 61952-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 360 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61952-MA?", "a": "Catalogue mass is 14500 g for 61952 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 61952-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "61952", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61952 (open arrangement) shares the 260×360×46 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61952-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6952 on the same 260×360×46 mm envelope, but catalogue C/C0 differ (212/270 kN vs 245/280 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": [ "61952-MA", "61952 MA" ], "locale_variants": {} }, { "sku": "16052-MA", "brand": "SKF", "manufacturer_designation": "16052 MA", "series": "16000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 44, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 238, "static_load_kN": 310, "fatigue_load_limit_kN": 7.2, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, the last two digits encode the bore: 16052 carries code 52 = 260 mm (code × 5). The envelope is 260×400×44 mm (10.236×15.748×1.732 in) with a 70.0 mm radial section height, C 238 kN, C0 310 kN and Pu 7.2 kN. The open 16052 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2800 r/min, catalogue mass 22500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 260 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 260 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.", "The MA suffix on 16052-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 22500 g quoted mass includes the heavier cage.", "Open 16052-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16052-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 260 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.", "Where two 16052 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 16052-MA?", "a": "The SKF 16052 MA measures 260 mm bore × 400 mm OD × 44 mm width (10.236 × 15.748 × 1.732 in), mass about 22500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16052 work?", "a": "The final two digits of 16052 are bore code 52, multiplied by 5 to give 260 mm." }, { "q": "What is the speed rating of 16052-MA?", "a": "SKF lists a 3200 r/min thermal reference speed and a 2800 r/min mechanical limiting speed for 16052 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 16052-MA and a same-bore 62-series bearing?", "a": "Section height differs: 16052-MA has a 70 mm radial section and C 238 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 16052-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 400 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "16052", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 16052 on the same 260×400×44 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "16052-MA", "16052 MA" ], "locale_variants": {} }, { "sku": "6052-M", "brand": "SKF", "manufacturer_designation": "6052 M", "series": "6000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 291, "static_load_kN": 375, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 29000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6052 carries code 52 = 260 mm (code × 5). The envelope is 260×400×65 mm (10.236×15.748×2.559 in) with a 70.0 mm radial section height, C 291 kN, C0 375 kN and Pu 8.8 kN. The open 6052 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2800 r/min, catalogue mass 29000 g.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 6052-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Fillet radii must clear the 6052-M chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6052-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 29000 g quoted mass includes the heavier cage.", "Open 6052-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6052-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6052-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6052-M?", "a": "The SKF 6052 M measures 260 mm bore × 400 mm OD × 65 mm width (10.236 × 15.748 × 2.559 in), mass about 29000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6052 work?", "a": "The final two digits of 6052 are bore code 52, multiplied by 5 to give 260 mm." }, { "q": "How heavy is 6052-M?", "a": "Catalogue mass is 29000 g for 6052 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6052-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6052-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6052", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6052 (open arrangement) shares the 260×400×65 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6052-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6052 on the same 260×400×65 mm envelope, but catalogue C/C0 differ (291/375 kN vs 325/375 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": [ "6052-M", "6052 M" ], "locale_variants": {} }, { "sku": "6252-M", "brand": "SKF", "manufacturer_designation": "6252 M", "series": "6200-series", "type": "deep_groove", "d_mm": 260, "D_mm": 480, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 390, "static_load_kN": 530, "fatigue_load_limit_kN": 11.8, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 65500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6252 carries code 52 = 260 mm (code × 5). The envelope is 260×480×80 mm (10.236×18.898×3.15 in) with a 110.0 mm radial section height, C 390 kN, C0 530 kN and Pu 11.8 kN. The open 6252 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2400 r/min, catalogue mass 65500 g.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Do not preload 6252-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6252-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The M suffix on 6252-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 65500 g quoted mass includes the heavier cage.", "Open 6252-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6252-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 6252-M chamfer so the 80 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 6252 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 6252 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 6252-M?", "a": "The SKF 6252 M measures 260 mm bore × 480 mm OD × 80 mm width (10.236 × 18.898 × 3.15 in), mass about 65500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6252 work?", "a": "The final two digits of 6252 are bore code 52, multiplied by 5 to give 260 mm." }, { "q": "What load can 6252-M take?", "a": "Catalogue values for 6252 M: dynamic C 390 kN, static C0 530 kN, fatigue limit Pu 11.8 kN. Use C in life calculation and C0 for static checks at 260 mm bore." }, { "q": "What is the speed rating of 6252-M?", "a": "SKF lists a 2600 r/min thermal reference speed and a 2400 r/min mechanical limiting speed for 6252 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6252-M and a same-bore 62-series bearing?", "a": "Section height differs: 6252-M has a 110 mm radial section and C 390 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "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": [ "6252-M", "6252 M" ], "locale_variants": {} }, { "sku": "61856-MA", "brand": "SKF", "manufacturer_designation": "61856 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 280, "D_mm": 350, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 138, "static_load_kN": 200, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 3400, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 7250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61856 carries code 56 = 280 mm (code × 5). The envelope is 280×350×33 mm (11.024×13.78×1.299 in) with a 35.0 mm radial section height, C 138 kN, C0 200 kN and Pu 4.75 kN. The open 61856 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2800 r/min, catalogue mass 7250 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The fatigue load limit is 4.75 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 4.75 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 61856-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 7250 g quoted mass includes the heavier cage.", "Open 61856-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61856-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 280 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 61856 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61856-MA?", "a": "The SKF 61856 MA measures 280 mm bore × 350 mm OD × 33 mm width (11.024 × 13.78 × 1.299 in), mass about 7250 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61856 work?", "a": "The final two digits of 61856 are bore code 56, multiplied by 5 to give 280 mm." }, { "q": "What is the speed rating of 61856-MA?", "a": "SKF lists a 3400 r/min thermal reference speed and a 2800 r/min mechanical limiting speed for 61856 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61856-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61856-MA has a 35 mm radial section and C 138 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61856-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 350 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "61856", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61856 (open arrangement) shares the 280×350×33 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61856-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6856 on the same 280×350×33 mm envelope, but catalogue C/C0 differ (138/200 kN vs 151/177 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": [ "61856-MA", "61856 MA" ], "locale_variants": {} }, { "sku": "61956-MA", "brand": "SKF", "manufacturer_designation": "61956 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 280, "D_mm": 380, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 216, "static_load_kN": 285, "fatigue_load_limit_kN": 6.7, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 15500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61956 carries code 56 = 280 mm (code × 5). The envelope is 280×380×46 mm (11.024×14.961×1.811 in) with a 50.0 mm radial section height, C 216 kN, C0 285 kN and Pu 6.7 kN. The open 61956 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2800 r/min, catalogue mass 15500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Fillet radii must clear the 61956-MA chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Clearance suffixes follow the seal code in the designation stack (e.g. 61956-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MA suffix on 61956-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 15500 g quoted mass includes the heavier cage.", "Open 61956-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61956-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 380 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61956-MA.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 61956-MA?", "a": "The SKF 61956 MA measures 280 mm bore × 380 mm OD × 46 mm width (11.024 × 14.961 × 1.811 in), mass about 15500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61956 work?", "a": "The final two digits of 61956 are bore code 56, multiplied by 5 to give 280 mm." }, { "q": "Which fits should I use for 61956-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 380 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61956-MA?", "a": "Catalogue mass is 15500 g for 61956 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 61956-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "61956", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61956 (open arrangement) shares the 280×380×46 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61956-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6956 on the same 280×380×46 mm envelope, but catalogue C/C0 differ (216/285 kN vs 252/299 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": [ "61956-MA", "61956 MA" ], "locale_variants": {} }, { "sku": "16056-MA", "brand": "SKF", "manufacturer_designation": "16056 MA", "series": "16000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 44, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 242, "static_load_kN": 335, "fatigue_load_limit_kN": 7.5, "reference_speed_rpm": 3000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 23500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, the last two digits encode the bore: 16056 carries code 56 = 280 mm (code × 5). The envelope is 280×420×44 mm (11.024×16.535×1.732 in) with a 70.0 mm radial section height, C 242 kN, C0 335 kN and Pu 7.5 kN. The open 16056 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2600 r/min, catalogue mass 23500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 16056-MA home through the outer ring or balls brinells the raceways.", "Do not preload 16056-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The MA suffix on 16056-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 23500 g quoted mass includes the heavier cage.", "Open 16056-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16056-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 16056-MA chamfer so the 44 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 16056 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 16056-MA?", "a": "The SKF 16056 MA measures 280 mm bore × 420 mm OD × 44 mm width (11.024 × 16.535 × 1.732 in), mass about 23500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16056 work?", "a": "The final two digits of 16056 are bore code 56, multiplied by 5 to give 280 mm." }, { "q": "Which fits should I use for 16056-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 420 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 16056-MA?", "a": "Catalogue mass is 23500 g for 16056 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 16056-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "16056", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 16056 on the same 280×420×44 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "16056-MA", "16056 MA" ], "locale_variants": {} }, { "sku": "6056-M", "brand": "SKF", "manufacturer_designation": "6056 M", "series": "6000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 302, "static_load_kN": 405, "fatigue_load_limit_kN": 9.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6056 carries code 56 = 280 mm (code × 5). The envelope is 280×420×65 mm (11.024×16.535×2.559 in) with a 70.0 mm radial section height, C 302 kN, C0 405 kN and Pu 9.3 kN. The open 6056 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2600 r/min, catalogue mass 31000 g.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "large industrial gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 6056-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Fillet radii must clear the 6056-M chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6056-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 31000 g quoted mass includes the heavier cage.", "Open 6056-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6056-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 6056-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6056-M?", "a": "The SKF 6056 M measures 280 mm bore × 420 mm OD × 65 mm width (11.024 × 16.535 × 2.559 in), mass about 31000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6056 work?", "a": "The final two digits of 6056 are bore code 56, multiplied by 5 to give 280 mm." }, { "q": "How heavy is 6056-M?", "a": "Catalogue mass is 31000 g for 6056 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6056-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6056-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6056", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 6056 (open arrangement) shares the 280×420×65 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "6056-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6056 on the same 280×420×65 mm envelope, but catalogue C/C0 differ (302/405 kN vs 360/420 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": [ "6056-M", "6056 M" ], "locale_variants": {} }, { "sku": "6256-M", "brand": "SKF", "manufacturer_designation": "6256 M", "series": "6200-series", "type": "deep_groove", "d_mm": 280, "D_mm": 500, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 423, "static_load_kN": 600, "fatigue_load_limit_kN": 12.9, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 72000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6256 carries code 56 = 280 mm (code × 5). The envelope is 280×500×80 mm (11.024×19.685×3.15 in) with a 110.0 mm radial section height, C 423 kN, C0 600 kN and Pu 12.9 kN. The open 6256 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2200 r/min, catalogue mass 72000 g.", "applications": [ "crusher auxiliary drives", "large industrial gearboxes", "heavy conveyor drives", "hoists and winches" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Catalogue ratings for 6256-M (C 423 kN, C0 600 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 280 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.", "The M suffix on 6256-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 72000 g quoted mass includes the heavier cage.", "Open 6256-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6256-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 280 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.", "Where two 6256 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 6256 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6256-M?", "a": "The SKF 6256 M measures 280 mm bore × 500 mm OD × 80 mm width (11.024 × 19.685 × 3.15 in), mass about 72000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6256 work?", "a": "The final two digits of 6256 are bore code 56, multiplied by 5 to give 280 mm." }, { "q": "What is the speed rating of 6256-M?", "a": "SKF lists a 2600 r/min thermal reference speed and a 2200 r/min mechanical limiting speed for 6256 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6256-M and a same-bore 62-series bearing?", "a": "Section height differs: 6256-M has a 110 mm radial section and C 423 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6256-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 500 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "6256-M", "6256 M" ], "locale_variants": {} }, { "sku": "61860-MA", "brand": "SKF", "manufacturer_designation": "61860 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 300, "D_mm": 380, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 172, "static_load_kN": 245, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61860 carries code 60 = 300 mm (code × 5). The envelope is 300×380×38 mm (11.811×14.961×1.496 in) with a 40.0 mm radial section height, C 172 kN, C0 245 kN and Pu 5.6 kN. The open 61860 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2600 r/min, catalogue mass 10500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "The fatigue load limit is 5.6 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Mount by heating the inner ring (max 120 °C) — driving 61860-MA home through the outer ring or balls brinells the raceways.", "The MA suffix on 61860-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 10500 g quoted mass includes the heavier cage.", "Open 61860-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61860-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 61860-MA chamfer so the 38 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 61860-MA?", "a": "The SKF 61860 MA measures 300 mm bore × 380 mm OD × 38 mm width (11.811 × 14.961 × 1.496 in), mass about 10500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61860 work?", "a": "The final two digits of 61860 are bore code 60, multiplied by 5 to give 300 mm." }, { "q": "What is the speed rating of 61860-MA?", "a": "SKF lists a 3200 r/min thermal reference speed and a 2600 r/min mechanical limiting speed for 61860 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61860-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61860-MA has a 40 mm radial section and C 172 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61860-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 380 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "61860", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61860 (open arrangement) shares the 300×380×38 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61860-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6860 on the same 300×380×38 mm envelope, but catalogue C/C0 differ (172/245 kN vs 179/210 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": [ "61860-MA", "61860 MA" ], "locale_variants": {} }, { "sku": "61960-MA", "brand": "SKF", "manufacturer_designation": "61960 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 300, "D_mm": 420, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 270, "static_load_kN": 375, "fatigue_load_limit_kN": 8.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 24500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61960 carries code 60 = 300 mm (code × 5). The envelope is 300×420×56 mm (11.811×16.535×2.205 in) with a 60.0 mm radial section height, C 270 kN, C0 375 kN and Pu 8.3 kN. The open 61960 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2400 r/min, catalogue mass 24500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 420 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61960-MA.", "Fillet radii must clear the 61960-MA chamfer so the 56 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MA suffix on 61960-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 24500 g quoted mass includes the heavier cage.", "Open 61960-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61960-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 61960-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 61960 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61960-MA?", "a": "The SKF 61960 MA measures 300 mm bore × 420 mm OD × 56 mm width (11.811 × 16.535 × 2.205 in), mass about 24500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61960 work?", "a": "The final two digits of 61960 are bore code 60, multiplied by 5 to give 300 mm." }, { "q": "How heavy is 61960-MA?", "a": "Catalogue mass is 24500 g for 61960 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 61960-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 61960-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "61960", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61960 (open arrangement) shares the 300×420×56 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61960-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6960 on the same 300×420×56 mm envelope, but catalogue C/C0 differ (270/375 kN vs 305/375 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": [ "61960-MA", "61960 MA" ], "locale_variants": {} }, { "sku": "16060-MA", "brand": "SKF", "manufacturer_designation": "16060 MA", "series": "16000-series", "type": "deep_groove", "d_mm": 300, "D_mm": 460, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 286, "static_load_kN": 405, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 2800, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 32000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, the last two digits encode the bore: 16060 carries code 60 = 300 mm (code × 5). The envelope is 300×460×50 mm (11.811×18.11×1.969 in) with a 80.0 mm radial section height, C 286 kN, C0 405 kN and Pu 8.8 kN. The open 16060 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1800 r/min, catalogue mass 32000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Catalogue ratings for 16060-MA (C 286 kN, C0 405 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.", "Mount by heating the inner ring (max 120 °C) — driving 16060-MA home through the outer ring or balls brinells the raceways.", "The MA suffix on 16060-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 32000 g quoted mass includes the heavier cage.", "Open 16060-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16060-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 16060-MA (C 286 kN, C0 405 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.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 16060-MA?", "a": "The SKF 16060 MA measures 300 mm bore × 460 mm OD × 50 mm width (11.811 × 18.11 × 1.969 in), mass about 32000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16060 work?", "a": "The final two digits of 16060 are bore code 60, multiplied by 5 to give 300 mm." }, { "q": "What is the difference between 16060-MA and a same-bore 62-series bearing?", "a": "Section height differs: 16060-MA has a 80 mm radial section and C 286 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 16060-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 460 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 16060-MA?", "a": "Catalogue mass is 32000 g for 16060 MA; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "16060", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 16060 on the same 300×460×50 mm envelope, but catalogue C/C0 differ (286/405 kN vs 325/410 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": [ "16060-MA", "16060 MA" ], "locale_variants": {} }, { "sku": "6060-M", "brand": "SKF", "manufacturer_designation": "6060 M", "series": "6000-series", "type": "deep_groove", "d_mm": 300, "D_mm": 460, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 358, "static_load_kN": 500, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 2800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 44000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6060 carries code 60 = 300 mm (code × 5). The envelope is 300×460×74 mm (11.811×18.11×2.913 in) with a 80.0 mm radial section height, C 358 kN, C0 500 kN and Pu 10.8 kN. The open 6060 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2400 r/min, catalogue mass 44000 g.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 6060-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Mount by heating the inner ring (max 120 °C) — driving 6060-M home through the outer ring or balls brinells the raceways.", "The M suffix on 6060-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 44000 g quoted mass includes the heavier cage.", "Open 6060-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6060-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 300 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.", "A replacement 6060 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 6060 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6060-M?", "a": "The SKF 6060 M measures 300 mm bore × 460 mm OD × 74 mm width (11.811 × 18.11 × 2.913 in), mass about 44000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6060 work?", "a": "The final two digits of 6060 are bore code 60, multiplied by 5 to give 300 mm." }, { "q": "What is the difference between 6060-M and a same-bore 62-series bearing?", "a": "Section height differs: 6060-M has a 80 mm radial section and C 358 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6060-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 460 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6060-M?", "a": "Catalogue mass is 44000 g for 6060 M; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "6060", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6060 on the same 300×460×74 mm envelope, but catalogue C/C0 differ (358/500 kN vs 395/480 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": [ "6060-M", "6060 M" ], "locale_variants": {} }, { "sku": "6260-M", "brand": "SKF", "manufacturer_designation": "6260 M", "series": "6200-series", "type": "deep_groove", "d_mm": 300, "D_mm": 540, "B_mm": 85, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 462, "static_load_kN": 670, "fatigue_load_limit_kN": 13.7, "reference_speed_rpm": 2400, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 88500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series, the last two digits encode the bore: 6260 carries code 60 = 300 mm (code × 5). The envelope is 300×540×85 mm (11.811×21.26×3.346 in) with a 120.0 mm radial section height, C 462 kN, C0 670 kN and Pu 13.7 kN. The open 6260 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2000 r/min, catalogue mass 88500 g.", "applications": [ "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Catalogue ratings for 6260-M (C 462 kN, C0 670 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 6260-M chamfer so the 85 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The M suffix on 6260-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 88500 g quoted mass includes the heavier cage.", "Open 6260-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6260-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 6260-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6260-M?", "a": "The SKF 6260 M measures 300 mm bore × 540 mm OD × 85 mm width (11.811 × 21.26 × 3.346 in), mass about 88500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6260 work?", "a": "The final two digits of 6260 are bore code 60, multiplied by 5 to give 300 mm." }, { "q": "What load can 6260-M take?", "a": "Catalogue values for 6260 M: dynamic C 462 kN, static C0 670 kN, fatigue limit Pu 13.7 kN. Use C in life calculation and C0 for static checks at 300 mm bore." }, { "q": "What is the speed rating of 6260-M?", "a": "SKF lists a 2400 r/min thermal reference speed and a 2000 r/min mechanical limiting speed for 6260 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6260-M and a same-bore 62-series bearing?", "a": "Section height differs: 6260-M has a 120 mm radial section and C 462 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "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": [ "6260-M", "6260 M" ], "locale_variants": {} }, { "sku": "61864-MA", "brand": "SKF", "manufacturer_designation": "61864 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 320, "D_mm": 400, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 172, "static_load_kN": 255, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 3000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61864 carries code 64 = 320 mm (code × 5). The envelope is 320×400×38 mm (12.598×15.748×1.496 in) with a 40.0 mm radial section height, C 172 kN, C0 255 kN and Pu 5.7 kN. The open 61864 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2400 r/min, catalogue mass 11000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 61864-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Catalogue ratings for 61864-MA (C 172 kN, C0 255 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 MA suffix on 61864-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 11000 g quoted mass includes the heavier cage.", "Open 61864-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61864-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 61864-MA home through the outer ring or balls brinells the raceways.", "A replacement 61864 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 61864 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61864-MA?", "a": "The SKF 61864 MA measures 320 mm bore × 400 mm OD × 38 mm width (12.598 × 15.748 × 1.496 in), mass about 11000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61864 work?", "a": "The final two digits of 61864 are bore code 64, multiplied by 5 to give 320 mm." }, { "q": "Which fits should I use for 61864-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 400 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61864-MA?", "a": "Catalogue mass is 11000 g for 61864 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 61864-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "61864", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61864 (open arrangement) shares the 320×400×38 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61864-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6864 on the same 320×400×38 mm envelope, but catalogue C/C0 differ (172/255 kN vs 186/228 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": [ "61864-MA", "61864 MA" ], "locale_variants": {} }, { "sku": "61964-MA", "brand": "SKF", "manufacturer_designation": "61964 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 320, "D_mm": 440, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 276, "static_load_kN": 400, "fatigue_load_limit_kN": 8.65, "reference_speed_rpm": 2800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 25500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61964 carries code 64 = 320 mm (code × 5). The envelope is 320×440×56 mm (12.598×17.323×2.205 in) with a 60.0 mm radial section height, C 276 kN, C0 400 kN and Pu 8.65 kN. The open 61964 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2400 r/min, catalogue mass 25500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Do not preload 61964-MA 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 61964-MA (C 276 kN, C0 400 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 MA suffix on 61964-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 25500 g quoted mass includes the heavier cage.", "Open 61964-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61964-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 61964-MA chamfer so the 56 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 61964 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 61964 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 61964-MA?", "a": "The SKF 61964 MA measures 320 mm bore × 440 mm OD × 56 mm width (12.598 × 17.323 × 2.205 in), mass about 25500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61964 work?", "a": "The final two digits of 61964 are bore code 64, multiplied by 5 to give 320 mm." }, { "q": "What internal clearance does 61964-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 61964-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 61964-MA take?", "a": "Catalogue values for 61964 MA: dynamic C 276 kN, static C0 400 kN, fatigue limit Pu 8.65 kN. Use C in life calculation and C0 for static checks at 320 mm bore." } ], "cross_ref": [ { "equiv_sku": "61964", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6964 on the same 320×440×56 mm envelope, but catalogue C/C0 differ (276/400 kN vs 315/405 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": [ "61964-MA", "61964 MA" ], "locale_variants": {} }, { "sku": "16064-MA", "brand": "SKF", "manufacturer_designation": "16064 MA", "series": "16000-series", "type": "deep_groove", "d_mm": 320, "D_mm": 480, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 281, "static_load_kN": 405, "fatigue_load_limit_kN": 8.65, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 34000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, the last two digits encode the bore: 16064 carries code 64 = 320 mm (code × 5). The envelope is 320×480×50 mm (12.598×18.898×1.969 in) with a 80.0 mm radial section height, C 281 kN, C0 405 kN and Pu 8.65 kN. The open 16064 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2200 r/min, catalogue mass 34000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 16064-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Deep-groove geometry tolerates only minutes of misalignment; if the 480 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 16064-MA.", "The MA suffix on 16064-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 34000 g quoted mass includes the heavier cage.", "Open 16064-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16064-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 16064-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 16064 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 16064 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 16064-MA?", "a": "The SKF 16064 MA measures 320 mm bore × 480 mm OD × 50 mm width (12.598 × 18.898 × 1.969 in), mass about 34000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16064 work?", "a": "The final two digits of 16064 are bore code 64, multiplied by 5 to give 320 mm." }, { "q": "What is the speed rating of 16064-MA?", "a": "SKF lists a 2600 r/min thermal reference speed and a 2200 r/min mechanical limiting speed for 16064 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 16064-MA and a same-bore 62-series bearing?", "a": "Section height differs: 16064-MA has a 80 mm radial section and C 281 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 16064-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 480 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "16064", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 16064 on the same 320×480×50 mm envelope, but catalogue C/C0 differ (281/405 kN vs 335/440 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": [ "16064-MA", "16064 MA" ], "locale_variants": {} }, { "sku": "6064-M", "brand": "SKF", "manufacturer_designation": "6064 M", "series": "6000-series", "type": "deep_groove", "d_mm": 320, "D_mm": 480, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 371, "static_load_kN": 540, "fatigue_load_limit_kN": 11.4, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 46000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6064 carries code 64 = 320 mm (code × 5). The envelope is 320×480×74 mm (12.598×18.898×2.913 in) with a 80.0 mm radial section height, C 371 kN, C0 540 kN and Pu 11.4 kN. The open 6064 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2200 r/min, catalogue mass 46000 g.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 6064-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Do not preload 6064-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6064-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 46000 g quoted mass includes the heavier cage.", "Open 6064-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6064-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 480 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6064-M.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 6064 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 6064-M?", "a": "The SKF 6064 M measures 320 mm bore × 480 mm OD × 74 mm width (12.598 × 18.898 × 2.913 in), mass about 46000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6064 work?", "a": "The final two digits of 6064 are bore code 64, multiplied by 5 to give 320 mm." }, { "q": "How heavy is 6064-M?", "a": "Catalogue mass is 46000 g for 6064 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6064-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6064-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6064", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6064 on the same 320×480×74 mm envelope, but catalogue C/C0 differ (371/540 kN vs 410/530 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": [ "6064-M", "6064 M" ], "locale_variants": {} }, { "sku": "61868-MA", "brand": "SKF", "manufacturer_designation": "61868 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 340, "D_mm": 420, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 178, "static_load_kN": 275, "fatigue_load_limit_kN": 6, "reference_speed_rpm": 2800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61868 carries code 68 = 340 mm (code × 5). The envelope is 340×420×38 mm (13.386×16.535×1.496 in) with a 40.0 mm radial section height, C 178 kN, C0 275 kN and Pu 6 kN. The open 61868 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2400 r/min, catalogue mass 11500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "At 340 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.", "Clearance suffixes follow the seal code in the designation stack (e.g. 61868-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MA suffix on 61868-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 11500 g quoted mass includes the heavier cage.", "Open 61868-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61868-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 61868-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 61868 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 61868-MA?", "a": "The SKF 61868 MA measures 340 mm bore × 420 mm OD × 38 mm width (13.386 × 16.535 × 1.496 in), mass about 11500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61868 work?", "a": "The final two digits of 61868 are bore code 68, multiplied by 5 to give 340 mm." }, { "q": "What is the speed rating of 61868-MA?", "a": "SKF lists a 2800 r/min thermal reference speed and a 2400 r/min mechanical limiting speed for 61868 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61868-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61868-MA has a 40 mm radial section and C 178 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61868-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 420 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "61868", "equiv_brand": "SKF", "level": "full", "note": "SKF SKF 61868 (open arrangement) shares the 340×420×38 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable." }, { "equiv_sku": "61868-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6868 on the same 340×420×38 mm envelope, but catalogue C/C0 differ (178/275 kN vs 189/236 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": [ "61868-MA", "61868 MA" ], "locale_variants": {} }, { "sku": "61968-MA", "brand": "SKF", "manufacturer_designation": "61968 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 340, "D_mm": 460, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 281, "static_load_kN": 425, "fatigue_load_limit_kN": 9, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 26500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61968 carries code 68 = 340 mm (code × 5). The envelope is 340×460×56 mm (13.386×18.11×2.205 in) with a 60.0 mm radial section height, C 281 kN, C0 425 kN and Pu 9 kN. The open 61968 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2200 r/min, catalogue mass 26500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Fillet radii must clear the 61968-MA chamfer so the 56 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Clearance suffixes follow the seal code in the designation stack (e.g. 61968-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MA suffix on 61968-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 26500 g quoted mass includes the heavier cage.", "Open 61968-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61968-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 61968-MA chamfer so the 56 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 61968 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 61968 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 61968-MA?", "a": "The SKF 61968 MA measures 340 mm bore × 460 mm OD × 56 mm width (13.386 × 18.11 × 2.205 in), mass about 26500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61968 work?", "a": "The final two digits of 61968 are bore code 68, multiplied by 5 to give 340 mm." }, { "q": "What internal clearance does 61968-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 61968-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 61968-MA take?", "a": "Catalogue values for 61968 MA: dynamic C 281 kN, static C0 425 kN, fatigue limit Pu 9 kN. Use C in life calculation and C0 for static checks at 340 mm bore." } ], "cross_ref": [ { "equiv_sku": "61968", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6968 on the same 340×460×56 mm envelope, but catalogue C/C0 differ (281/425 kN vs 325/430 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": [ "61968-MA", "61968 MA" ], "locale_variants": {} }, { "sku": "16068-MA", "brand": "SKF", "manufacturer_designation": "16068 MA", "series": "16000-series", "type": "deep_groove", "d_mm": 340, "D_mm": 520, "B_mm": 57, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 345, "static_load_kN": 520, "fatigue_load_limit_kN": 10.6, "reference_speed_rpm": 2400, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 45000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, the last two digits encode the bore: 16068 carries code 68 = 340 mm (code × 5). The envelope is 340×520×57 mm (13.386×20.472×2.244 in) with a 90.0 mm radial section height, C 345 kN, C0 520 kN and Pu 10.6 kN. The open 16068 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2000 r/min, catalogue mass 45000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 340 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. 16068-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MA suffix on 16068-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 45000 g quoted mass includes the heavier cage.", "Open 16068-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16068-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 340 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.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 16068 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 16068-MA?", "a": "The SKF 16068 MA measures 340 mm bore × 520 mm OD × 57 mm width (13.386 × 20.472 × 2.244 in), mass about 45000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16068 work?", "a": "The final two digits of 16068 are bore code 68, multiplied by 5 to give 340 mm." }, { "q": "What load can 16068-MA take?", "a": "Catalogue values for 16068 MA: dynamic C 345 kN, static C0 520 kN, fatigue limit Pu 10.6 kN. Use C in life calculation and C0 for static checks at 340 mm bore." }, { "q": "What is the speed rating of 16068-MA?", "a": "SKF lists a 2400 r/min thermal reference speed and a 2000 r/min mechanical limiting speed for 16068 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 16068-MA and a same-bore 62-series bearing?", "a": "Section height differs: 16068-MA has a 90 mm radial section and C 345 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "16068", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 16068 on the same 340×520×57 mm envelope, but catalogue C/C0 differ (345/520 kN vs 380/515 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": [ "16068-MA", "16068 MA" ], "locale_variants": {} }, { "sku": "6068-M", "brand": "SKF", "manufacturer_designation": "6068 M", "series": "6000-series", "type": "deep_groove", "d_mm": 340, "D_mm": 520, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 423, "static_load_kN": 640, "fatigue_load_limit_kN": 13.2, "reference_speed_rpm": 2400, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 62000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6068 carries code 68 = 340 mm (code × 5). The envelope is 340×520×82 mm (13.386×20.472×3.228 in) with a 90.0 mm radial section height, C 423 kN, C0 640 kN and Pu 13.2 kN. The open 6068 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2200 r/min, catalogue mass 62000 g.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Fillet radii must clear the 6068-M chamfer so the 82 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Catalogue ratings for 6068-M (C 423 kN, C0 640 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 M suffix on 6068-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 62000 g quoted mass includes the heavier cage.", "Open 6068-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6068-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 340 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.", "A replacement 6068 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6068-M?", "a": "The SKF 6068 M measures 340 mm bore × 520 mm OD × 82 mm width (13.386 × 20.472 × 3.228 in), mass about 62000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6068 work?", "a": "The final two digits of 6068 are bore code 68, multiplied by 5 to give 340 mm." }, { "q": "Which fits should I use for 6068-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 520 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6068-M?", "a": "Catalogue mass is 62000 g for 6068 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6068-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "6068", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6068 on the same 340×520×82 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6068-M", "6068 M" ], "locale_variants": {} }, { "sku": "61872-MA", "brand": "SKF", "manufacturer_designation": "61872 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 360, "D_mm": 440, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 182, "static_load_kN": 285, "fatigue_load_limit_kN": 6.1, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 12000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61872 carries code 72 = 360 mm (code × 5). The envelope is 360×440×38 mm (14.173×17.323×1.496 in) with a 40.0 mm radial section height, C 182 kN, C0 285 kN and Pu 6.1 kN. The open 61872 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2200 r/min, catalogue mass 12000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 61872-MA home through the outer ring or balls brinells the raceways.", "Fillet radii must clear the 61872-MA chamfer so the 38 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MA suffix on 61872-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 12000 g quoted mass includes the heavier cage.", "Open 61872-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61872-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 61872-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 61872 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 61872-MA?", "a": "The SKF 61872 MA measures 360 mm bore × 440 mm OD × 38 mm width (14.173 × 17.323 × 1.496 in), mass about 12000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61872 work?", "a": "The final two digits of 61872 are bore code 72, multiplied by 5 to give 360 mm." }, { "q": "How long can a greased 61872-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 61872-MA take?", "a": "Catalogue values for 61872 MA: dynamic C 182 kN, static C0 285 kN, fatigue limit Pu 6.1 kN. Use C in life calculation and C0 for static checks at 360 mm bore." }, { "q": "What is the speed rating of 61872-MA?", "a": "SKF lists a 2600 r/min thermal reference speed and a 2200 r/min mechanical limiting speed for 61872 MA; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "61872", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6872 on the same 360×440×38 mm envelope, but catalogue C/C0 differ (182/285 kN vs 207/258 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": [ "61872-MA", "61872 MA" ], "locale_variants": {} }, { "sku": "61972-MA", "brand": "SKF", "manufacturer_designation": "61972 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 360, "D_mm": 480, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 291, "static_load_kN": 450, "fatigue_load_limit_kN": 9.15, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 28000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61972 carries code 72 = 360 mm (code × 5). The envelope is 360×480×56 mm (14.173×18.898×2.205 in) with a 60.0 mm radial section height, C 291 kN, C0 450 kN and Pu 9.15 kN. The open 61972 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2200 r/min, catalogue mass 28000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "The fatigue load limit is 9.15 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Mount by heating the inner ring (max 120 °C) — driving 61972-MA home through the outer ring or balls brinells the raceways.", "The MA suffix on 61972-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 28000 g quoted mass includes the heavier cage.", "Open 61972-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61972-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 9.15 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 61972 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 61972-MA?", "a": "The SKF 61972 MA measures 360 mm bore × 480 mm OD × 56 mm width (14.173 × 18.898 × 2.205 in), mass about 28000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61972 work?", "a": "The final two digits of 61972 are bore code 72, multiplied by 5 to give 360 mm." }, { "q": "How heavy is 61972-MA?", "a": "Catalogue mass is 28000 g for 61972 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 61972-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 61972-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "61972", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6972 on the same 360×480×56 mm envelope, but catalogue C/C0 differ (291/450 kN vs 330/455 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": [ "61972-MA", "61972 MA" ], "locale_variants": {} }, { "sku": "16072-MA", "brand": "SKF", "manufacturer_designation": "16072 MA", "series": "16000-series", "type": "deep_groove", "d_mm": 360, "D_mm": 540, "B_mm": 57, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 351, "static_load_kN": 550, "fatigue_load_limit_kN": 11, "reference_speed_rpm": 1800, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 49000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, the last two digits encode the bore: 16072 carries code 72 = 360 mm (code × 5). The envelope is 360×540×57 mm (14.173×21.26×2.244 in) with a 90.0 mm radial section height, C 351 kN, C0 550 kN and Pu 11 kN. The open 16072 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1400 r/min, catalogue mass 49000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Do not preload 16072-MA 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 360 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 MA suffix on 16072-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 49000 g quoted mass includes the heavier cage.", "Open 16072-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16072-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 16072-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 16072 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 16072 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 16072-MA?", "a": "The SKF 16072 MA measures 360 mm bore × 540 mm OD × 57 mm width (14.173 × 21.26 × 2.244 in), mass about 49000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16072 work?", "a": "The final two digits of 16072 are bore code 72, multiplied by 5 to give 360 mm." }, { "q": "What is the speed rating of 16072-MA?", "a": "SKF lists a 1800 r/min thermal reference speed and a 1400 r/min mechanical limiting speed for 16072 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 16072-MA and a same-bore 62-series bearing?", "a": "Section height differs: 16072-MA has a 90 mm radial section and C 351 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 16072-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 540 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "16072", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 16072 on the same 360×540×57 mm envelope, but catalogue C/C0 differ (351/550 kN vs 390/550 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": [ "16072-MA", "16072 MA" ], "locale_variants": {} }, { "sku": "6072-M", "brand": "SKF", "manufacturer_designation": "6072 M", "series": "6000-series", "type": "deep_groove", "d_mm": 360, "D_mm": 540, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 442, "static_load_kN": 695, "fatigue_load_limit_kN": 14, "reference_speed_rpm": 2400, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 64500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6072 carries code 72 = 360 mm (code × 5). The envelope is 360×540×82 mm (14.173×21.26×3.228 in) with a 90.0 mm radial section height, C 442 kN, C0 695 kN and Pu 14 kN. The open 6072 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1900 r/min, catalogue mass 64500 g.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "The fatigue load limit is 14 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Mount by heating the inner ring (max 120 °C) — driving 6072-M home through the outer ring or balls brinells the raceways.", "The M suffix on 6072-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 64500 g quoted mass includes the heavier cage.", "Open 6072-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6072-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 6072-M chamfer so the 82 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 6072 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 6072 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 6072-M?", "a": "The SKF 6072 M measures 360 mm bore × 540 mm OD × 82 mm width (14.173 × 21.26 × 3.228 in), mass about 64500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6072 work?", "a": "The final two digits of 6072 are bore code 72, multiplied by 5 to give 360 mm." }, { "q": "What internal clearance does 6072-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6072-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6072-M take?", "a": "Catalogue values for 6072 M: dynamic C 442 kN, static C0 695 kN, fatigue limit Pu 14 kN. Use C in life calculation and C0 for static checks at 360 mm bore." } ], "cross_ref": [ { "equiv_sku": "6072", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6072 on the same 360×540×82 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6072-M", "6072 M" ], "locale_variants": {} }, { "sku": "61876-MA", "brand": "SKF", "manufacturer_designation": "61876 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 380, "D_mm": 480, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 242, "static_load_kN": 390, "fatigue_load_limit_kN": 8, "reference_speed_rpm": 2400, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 20000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61876 carries code 76 = 380 mm (code × 5). The envelope is 380×480×46 mm (14.961×18.898×1.811 in) with a 50.0 mm radial section height, C 242 kN, C0 390 kN and Pu 8 kN. The open 61876 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 2000 r/min, catalogue mass 20000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 380 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 61876-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The MA suffix on 61876-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 20000 g quoted mass includes the heavier cage.", "Open 61876-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61876-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 61876-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 61876 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 61876-MA?", "a": "The SKF 61876 MA measures 380 mm bore × 480 mm OD × 46 mm width (14.961 × 18.898 × 1.811 in), mass about 20000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61876 work?", "a": "The final two digits of 61876 are bore code 76, multiplied by 5 to give 380 mm." }, { "q": "What load can 61876-MA take?", "a": "Catalogue values for 61876 MA: dynamic C 242 kN, static C0 390 kN, fatigue limit Pu 8 kN. Use C in life calculation and C0 for static checks at 380 mm bore." }, { "q": "What is the speed rating of 61876-MA?", "a": "SKF lists a 2400 r/min thermal reference speed and a 2000 r/min mechanical limiting speed for 61876 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61876-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61876-MA has a 50 mm radial section and C 242 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "61876", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6876 on the same 380×480×46 mm envelope, but catalogue C/C0 differ (242/390 kN vs 256/340 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": [ "61876-MA", "61876 MA" ], "locale_variants": {} }, { "sku": "61976-MA", "brand": "SKF", "manufacturer_designation": "61976 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 380, "D_mm": 520, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 338, "static_load_kN": 540, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 2400, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 40000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61976 carries code 76 = 380 mm (code × 5). The envelope is 380×520×65 mm (14.961×20.472×2.559 in) with a 70.0 mm radial section height, C 338 kN, C0 540 kN and Pu 10.8 kN. The open 61976 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1900 r/min, catalogue mass 40000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 520 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61976-MA.", "Clearance suffixes follow the seal code in the designation stack (e.g. 61976-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MA suffix on 61976-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 40000 g quoted mass includes the heavier cage.", "Open 61976-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61976-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 61976-MA chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 61976-MA?", "a": "The SKF 61976 MA measures 380 mm bore × 520 mm OD × 65 mm width (14.961 × 20.472 × 2.559 in), mass about 40000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61976 work?", "a": "The final two digits of 61976 are bore code 76, multiplied by 5 to give 380 mm." }, { "q": "How heavy is 61976-MA?", "a": "Catalogue mass is 40000 g for 61976 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 61976-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 61976-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "61976", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6976 on the same 380×520×65 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "61976-MA", "61976 MA" ], "locale_variants": {} }, { "sku": "16076-MA", "brand": "SKF", "manufacturer_designation": "16076 MA", "series": "16000-series", "type": "deep_groove", "d_mm": 380, "D_mm": 560, "B_mm": 57, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 377, "static_load_kN": 620, "fatigue_load_limit_kN": 12.2, "reference_speed_rpm": 2200, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 51000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series, the last two digits encode the bore: 16076 carries code 76 = 380 mm (code × 5). The envelope is 380×560×57 mm (14.961×22.047×2.244 in) with a 90.0 mm radial section height, C 377 kN, C0 620 kN and Pu 12.2 kN. The open 16076 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1400 r/min, catalogue mass 51000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 16076-MA home through the outer ring or balls brinells the raceways.", "Deep-groove geometry tolerates only minutes of misalignment; if the 560 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 16076-MA.", "The MA suffix on 16076-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 51000 g quoted mass includes the heavier cage.", "Open 16076-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 16076-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 12.2 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 16076 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 16076-MA?", "a": "The SKF 16076 MA measures 380 mm bore × 560 mm OD × 57 mm width (14.961 × 22.047 × 2.244 in), mass about 51000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 16076 work?", "a": "The final two digits of 16076 are bore code 76, multiplied by 5 to give 380 mm." }, { "q": "What is the speed rating of 16076-MA?", "a": "SKF lists a 2200 r/min thermal reference speed and a 1400 r/min mechanical limiting speed for 16076 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 16076-MA and a same-bore 62-series bearing?", "a": "Section height differs: 16076-MA has a 90 mm radial section and C 377 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 16076-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 560 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "16076-MA", "16076 MA" ], "locale_variants": {} }, { "sku": "6076-M", "brand": "SKF", "manufacturer_designation": "6076 M", "series": "6000-series", "type": "deep_groove", "d_mm": 380, "D_mm": 560, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 436, "static_load_kN": 695, "fatigue_load_limit_kN": 13.7, "reference_speed_rpm": 2200, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 70500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6076 carries code 76 = 380 mm (code × 5). The envelope is 380×560×82 mm (14.961×22.047×3.228 in) with a 90.0 mm radial section height, C 436 kN, C0 695 kN and Pu 13.7 kN. The open 6076 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1800 r/min, catalogue mass 70500 g.", "applications": [ "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives", "hoists and winches" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 6076-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Do not preload 6076-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6076-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 70500 g quoted mass includes the heavier cage.", "Open 6076-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6076-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 380 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.", "Where two 6076 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 6076-M?", "a": "The SKF 6076 M measures 380 mm bore × 560 mm OD × 82 mm width (14.961 × 22.047 × 3.228 in), mass about 70500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6076 work?", "a": "The final two digits of 6076 are bore code 76, multiplied by 5 to give 380 mm." }, { "q": "How long can a greased 6076-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 6076-M take?", "a": "Catalogue values for 6076 M: dynamic C 436 kN, static C0 695 kN, fatigue limit Pu 13.7 kN. Use C in life calculation and C0 for static checks at 380 mm bore." }, { "q": "What is the speed rating of 6076-M?", "a": "SKF lists a 2200 r/min thermal reference speed and a 1800 r/min mechanical limiting speed for 6076 M; real limits also depend on lubrication and fits." } ], "cross_ref": [ { "equiv_sku": "6076", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6076 on the same 380×560×82 mm envelope, but catalogue C/C0 differ (436/695 kN vs 505/725 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": [ "6076-M", "6076 M" ], "locale_variants": {} }, { "sku": "61880-MA", "brand": "SKF", "manufacturer_designation": "61880 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 400, "D_mm": 500, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 247, "static_load_kN": 405, "fatigue_load_limit_kN": 8.15, "reference_speed_rpm": 2400, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 20500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61880 carries code 80 = 400 mm (code × 5). The envelope is 400×500×46 mm (15.748×19.685×1.811 in) with a 50.0 mm radial section height, C 247 kN, C0 405 kN and Pu 8.15 kN. The open 61880 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1900 r/min, catalogue mass 20500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 500 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61880-MA.", "Assign interference to the rotating ring: on a conventional shaft-mounted 400 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 MA suffix on 61880-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 20500 g quoted mass includes the heavier cage.", "Open 61880-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61880-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 61880-MA home through the outer ring or balls brinells the raceways.", "A replacement 61880 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 61880-MA?", "a": "The SKF 61880 MA measures 400 mm bore × 500 mm OD × 46 mm width (15.748 × 19.685 × 1.811 in), mass about 20500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61880 work?", "a": "The final two digits of 61880 are bore code 80, multiplied by 5 to give 400 mm." }, { "q": "Which fits should I use for 61880-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 500 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61880-MA?", "a": "Catalogue mass is 20500 g for 61880 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 61880-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "cross_ref": [ { "equiv_sku": "61880", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6880 on the same 400×500×46 mm envelope, but catalogue C/C0 differ (247/405 kN vs 251/340 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": [ "61880-MA", "61880 MA" ], "locale_variants": {} }, { "sku": "61980-MA", "brand": "SKF", "manufacturer_designation": "61980 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 400, "D_mm": 540, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 345, "static_load_kN": 570, "fatigue_load_limit_kN": 11.2, "reference_speed_rpm": 2200, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 41500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61980 carries code 80 = 400 mm (code × 5). The envelope is 400×540×65 mm (15.748×21.26×2.559 in) with a 70.0 mm radial section height, C 345 kN, C0 570 kN and Pu 11.2 kN. The open 61980 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1800 r/min, catalogue mass 41500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 540 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61980-MA.", "Do not preload 61980-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The MA suffix on 61980-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 41500 g quoted mass includes the heavier cage.", "Open 61980-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61980-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 61980-MA home through the outer ring or balls brinells the raceways.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 61980 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61980-MA?", "a": "The SKF 61980 MA measures 400 mm bore × 540 mm OD × 65 mm width (15.748 × 21.26 × 2.559 in), mass about 41500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61980 work?", "a": "The final two digits of 61980 are bore code 80, multiplied by 5 to give 400 mm." }, { "q": "What internal clearance does 61980-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 61980-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 61980-MA take?", "a": "Catalogue values for 61980 MA: dynamic C 345 kN, static C0 570 kN, fatigue limit Pu 11.2 kN. Use C in life calculation and C0 for static checks at 400 mm bore." } ], "cross_ref": [ { "equiv_sku": "61980", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6980 on the same 400×540×65 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "61980-MA", "61980 MA" ], "locale_variants": {} }, { "sku": "6080-M", "brand": "SKF", "manufacturer_designation": "6080 M", "series": "6000-series", "type": "deep_groove", "d_mm": 400, "D_mm": 600, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 520, "static_load_kN": 865, "fatigue_load_limit_kN": 16.3, "reference_speed_rpm": 2000, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 87500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6080 carries code 80 = 400 mm (code × 5). The envelope is 400×600×90 mm (15.748×23.622×3.543 in) with a 100.0 mm radial section height, C 520 kN, C0 865 kN and Pu 16.3 kN. The open 6080 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1700 r/min, catalogue mass 87500 g.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "At 400 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.", "The fatigue load limit is 16.3 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The M suffix on 6080-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 87500 g quoted mass includes the heavier cage.", "Open 6080-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6080-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 6080-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 6080-M?", "a": "The SKF 6080 M measures 400 mm bore × 600 mm OD × 90 mm width (15.748 × 23.622 × 3.543 in), mass about 87500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6080 work?", "a": "The final two digits of 6080 are bore code 80, multiplied by 5 to give 400 mm." }, { "q": "What is the speed rating of 6080-M?", "a": "SKF lists a 2000 r/min thermal reference speed and a 1700 r/min mechanical limiting speed for 6080 M; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6080-M and a same-bore 62-series bearing?", "a": "Section height differs: 6080-M has a 100 mm radial section and C 520 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6080-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 600 mm housing; reverse the interference if the outer ring rotates." } ], "cross_ref": [ { "equiv_sku": "6080", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6080 on the same 400×600×90 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "6080-M", "6080 M" ], "locale_variants": {} }, { "sku": "61884-MA", "brand": "SKF", "manufacturer_designation": "61884 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 420, "D_mm": 520, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 251, "static_load_kN": 425, "fatigue_load_limit_kN": 8.3, "reference_speed_rpm": 2200, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 21500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61884 carries code 84 = 420 mm (code × 5). The envelope is 420×520×46 mm (16.535×20.472×1.811 in) with a 50.0 mm radial section height, C 251 kN, C0 425 kN and Pu 8.3 kN. The open 61884 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1800 r/min, catalogue mass 21500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 420 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. 61884-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MA suffix on 61884-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 21500 g quoted mass includes the heavier cage.", "Open 61884-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61884-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 8.3 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 61884 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 61884-MA?", "a": "The SKF 61884 MA measures 420 mm bore × 520 mm OD × 46 mm width (16.535 × 20.472 × 1.811 in), mass about 21500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61884 work?", "a": "The final two digits of 61884 are bore code 84, multiplied by 5 to give 420 mm." }, { "q": "What is the difference between 61884-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61884-MA has a 50 mm radial section and C 251 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61884-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 520 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61884-MA?", "a": "Catalogue mass is 21500 g for 61884 MA; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "61884", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6884 on the same 420×520×46 mm envelope, but catalogue C/C0 differ (251/425 kN vs 288/405 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": [ "61884-MA", "61884 MA" ], "locale_variants": {} }, { "sku": "61984-MA", "brand": "SKF", "manufacturer_designation": "61984 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 420, "D_mm": 560, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 351, "static_load_kN": 600, "fatigue_load_limit_kN": 11.4, "reference_speed_rpm": 2200, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 43000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61984 carries code 84 = 420 mm (code × 5). The envelope is 420×560×65 mm (16.535×22.047×2.559 in) with a 70.0 mm radial section height, C 351 kN, C0 600 kN and Pu 11.4 kN. The open 61984 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1800 r/min, catalogue mass 43000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Fillet radii must clear the 61984-MA chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "At 420 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.", "The MA suffix on 61984-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 43000 g quoted mass includes the heavier cage.", "Open 61984-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61984-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 420 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 61984 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 61984-MA?", "a": "The SKF 61984 MA measures 420 mm bore × 560 mm OD × 65 mm width (16.535 × 22.047 × 2.559 in), mass about 43000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61984 work?", "a": "The final two digits of 61984 are bore code 84, multiplied by 5 to give 420 mm." }, { "q": "What is the difference between 61984-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61984-MA has a 70 mm radial section and C 351 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61984-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 560 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61984-MA?", "a": "Catalogue mass is 43000 g for 61984 MA; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "61984", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6984 on the same 420×560×65 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "61984-MA", "61984 MA" ], "locale_variants": {} }, { "sku": "6084-M", "brand": "SKF", "manufacturer_designation": "6084 M", "series": "6000-series", "type": "deep_groove", "d_mm": 420, "D_mm": 620, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 507, "static_load_kN": 880, "fatigue_load_limit_kN": 16.3, "reference_speed_rpm": 2000, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 91500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6084 carries code 84 = 420 mm (code × 5). The envelope is 420×620×90 mm (16.535×24.409×3.543 in) with a 100.0 mm radial section height, C 507 kN, C0 880 kN and Pu 16.3 kN. The open 6084 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1600 r/min, catalogue mass 91500 g.", "applications": [ "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Fillet radii must clear the 6084-M chamfer so the 90 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload 6084-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The M suffix on 6084-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 91500 g quoted mass includes the heavier cage.", "Open 6084-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6084-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 16.3 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6084-M?", "a": "The SKF 6084 M measures 420 mm bore × 620 mm OD × 90 mm width (16.535 × 24.409 × 3.543 in), mass about 91500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6084 work?", "a": "The final two digits of 6084 are bore code 84, multiplied by 5 to give 420 mm." }, { "q": "How heavy is 6084-M?", "a": "Catalogue mass is 91500 g for 6084 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6084-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 6084-M be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "cross_ref": [ { "equiv_sku": "6084", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6084 on the same 420×620×90 mm envelope, but catalogue C/C0 differ (507/880 kN vs 590/895 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": [ "6084-M", "6084 M" ], "locale_variants": {} }, { "sku": "61888-MA", "brand": "SKF", "manufacturer_designation": "61888 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 440, "D_mm": 540, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 255, "static_load_kN": 440, "fatigue_load_limit_kN": 8.5, "reference_speed_rpm": 2200, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61888 carries code 88 = 440 mm (code × 5). The envelope is 440×540×46 mm (17.323×21.26×1.811 in) with a 50.0 mm radial section height, C 255 kN, C0 440 kN and Pu 8.5 kN. The open 61888 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1800 r/min, catalogue mass 22500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "At 440 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 540 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61888-MA.", "The MA suffix on 61888-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 22500 g quoted mass includes the heavier cage.", "Open 61888-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61888-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 440 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.", "A replacement 61888 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 61888-MA?", "a": "The SKF 61888 MA measures 440 mm bore × 540 mm OD × 46 mm width (17.323 × 21.26 × 1.811 in), mass about 22500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61888 work?", "a": "The final two digits of 61888 are bore code 88, multiplied by 5 to give 440 mm." }, { "q": "What load can 61888-MA take?", "a": "Catalogue values for 61888 MA: dynamic C 255 kN, static C0 440 kN, fatigue limit Pu 8.5 kN. Use C in life calculation and C0 for static checks at 440 mm bore." }, { "q": "What is the speed rating of 61888-MA?", "a": "SKF lists a 2200 r/min thermal reference speed and a 1800 r/min mechanical limiting speed for 61888 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61888-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61888-MA has a 50 mm radial section and C 255 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "61888", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6888 on the same 440×540×46 mm envelope, but catalogue C/C0 differ (255/440 kN vs 292/420 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": [ "61888-MA", "61888 MA" ], "locale_variants": {} }, { "sku": "61988-MA", "brand": "SKF", "manufacturer_designation": "61988 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 440, "D_mm": 600, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 410, "static_load_kN": 720, "fatigue_load_limit_kN": 13.2, "reference_speed_rpm": 2000, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 60500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61988 carries code 88 = 440 mm (code × 5). The envelope is 440×600×74 mm (17.323×23.622×2.913 in) with a 80.0 mm radial section height, C 410 kN, C0 720 kN and Pu 13.2 kN. The open 61988 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1600 r/min, catalogue mass 60500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 600 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61988-MA.", "Mount by heating the inner ring (max 120 °C) — driving 61988-MA home through the outer ring or balls brinells the raceways.", "The MA suffix on 61988-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 60500 g quoted mass includes the heavier cage.", "Open 61988-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61988-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 440 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.", "Where two 61988 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 61988-MA?", "a": "The SKF 61988 MA measures 440 mm bore × 600 mm OD × 74 mm width (17.323 × 23.622 × 2.913 in), mass about 60500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61988 work?", "a": "The final two digits of 61988 are bore code 88, multiplied by 5 to give 440 mm." }, { "q": "What load can 61988-MA take?", "a": "Catalogue values for 61988 MA: dynamic C 410 kN, static C0 720 kN, fatigue limit Pu 13.2 kN. Use C in life calculation and C0 for static checks at 440 mm bore." }, { "q": "What is the speed rating of 61988-MA?", "a": "SKF lists a 2000 r/min thermal reference speed and a 1600 r/min mechanical limiting speed for 61988 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 61988-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61988-MA has a 80 mm radial section and C 410 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "cross_ref": [ { "equiv_sku": "61988", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6988 on the same 440×600×74 mm envelope, but catalogue C/C0 differ (410/720 kN vs 405/615 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": [ "61988-MA", "61988 MA" ], "locale_variants": {} }, { "sku": "6088-M", "brand": "SKF", "manufacturer_designation": "6088 M", "series": "6000-series", "type": "deep_groove", "d_mm": 440, "D_mm": 650, "B_mm": 94, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 553, "static_load_kN": 965, "fatigue_load_limit_kN": 17.6, "reference_speed_rpm": 1900, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 105000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6088 carries code 88 = 440 mm (code × 5). The envelope is 440×650×94 mm (17.323×25.591×3.701 in) with a 105.0 mm radial section height, C 553 kN, C0 965 kN and Pu 17.6 kN. The open 6088 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1500 r/min, catalogue mass 105000 g.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "At 440 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.", "The fatigue load limit is 17.6 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The M suffix on 6088-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 105000 g quoted mass includes the heavier cage.", "Open 6088-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6088-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 440 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.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 6088 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6088-M?", "a": "The SKF 6088 M measures 440 mm bore × 650 mm OD × 94 mm width (17.323 × 25.591 × 3.701 in), mass about 105000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6088 work?", "a": "The final two digits of 6088 are bore code 88, multiplied by 5 to give 440 mm." }, { "q": "Which fits should I use for 6088-M?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 650 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 6088-M?", "a": "Catalogue mass is 105000 g for 6088 M; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 6088-M have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "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": [ "6088-M", "6088 M" ], "locale_variants": {} }, { "sku": "61892-MA", "brand": "SKF", "manufacturer_designation": "61892 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 460, "D_mm": 580, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 319, "static_load_kN": 570, "fatigue_load_limit_kN": 10.6, "reference_speed_rpm": 2000, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 35000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61892 carries code 92 = 460 mm (code × 5). The envelope is 460×580×56 mm (18.11×22.835×2.205 in) with a 60.0 mm radial section height, C 319 kN, C0 570 kN and Pu 10.6 kN. The open 61892 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1600 r/min, catalogue mass 35000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 61892-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Assign interference to the rotating ring: on a conventional shaft-mounted 460 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 MA suffix on 61892-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 35000 g quoted mass includes the heavier cage.", "Open 61892-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61892-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 460 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 61892-MA?", "a": "The SKF 61892 MA measures 460 mm bore × 580 mm OD × 56 mm width (18.11 × 22.835 × 2.205 in), mass about 35000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61892 work?", "a": "The final two digits of 61892 are bore code 92, multiplied by 5 to give 460 mm." }, { "q": "What is the difference between 61892-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61892-MA has a 60 mm radial section and C 319 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61892-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 580 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61892-MA?", "a": "Catalogue mass is 35000 g for 61892 MA; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "61892", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6892 on the same 460×580×56 mm envelope, but catalogue C/C0 differ (319/570 kN vs 350/515 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": [ "61892-MA", "61892 MA" ], "locale_variants": {} }, { "sku": "61992-MA", "brand": "SKF", "manufacturer_designation": "61992 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 460, "D_mm": 620, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 423, "static_load_kN": 750, "fatigue_load_limit_kN": 13.7, "reference_speed_rpm": 1900, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 62500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61992 carries code 92 = 460 mm (code × 5). The envelope is 460×620×74 mm (18.11×24.409×2.913 in) with a 80.0 mm radial section height, C 423 kN, C0 750 kN and Pu 13.7 kN. The open 61992 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1600 r/min, catalogue mass 62500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 620 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61992-MA.", "The fatigue load limit is 13.7 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 61992-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 62500 g quoted mass includes the heavier cage.", "Open 61992-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61992-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 61992-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 61992-MA?", "a": "The SKF 61992 MA measures 460 mm bore × 620 mm OD × 74 mm width (18.11 × 24.409 × 2.913 in), mass about 62500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61992 work?", "a": "The final two digits of 61992 are bore code 92, multiplied by 5 to give 460 mm." }, { "q": "What is the difference between 61992-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61992-MA has a 80 mm radial section and C 423 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61992-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 620 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61992-MA?", "a": "Catalogue mass is 62500 g for 61992 MA; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "61992", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6992 on the same 460×620×74 mm envelope, but catalogue C/C0 differ (423/750 kN vs 415/645 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": [ "61992-MA", "61992 MA" ], "locale_variants": {} }, { "sku": "6092-MB", "brand": "SKF", "manufacturer_designation": "6092 MB", "series": "6000-series", "type": "deep_groove", "d_mm": 460, "D_mm": 680, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 582, "static_load_kN": 1060, "fatigue_load_limit_kN": 19, "reference_speed_rpm": 1800, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 120000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6092 carries code 92 = 460 mm (code × 5). The envelope is 460×680×100 mm (18.11×26.772×3.937 in) with a 110.0 mm radial section height, C 582 kN, C0 1060 kN and Pu 19 kN. The open 6092 MB carries no shields or seals and relies on application lubrication and external sealing. The MB suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1500 r/min, catalogue mass 120000 g.", "applications": [ "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "At 460 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 460 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.", "The MB suffix on 6092-MB denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 120000 g quoted mass includes the heavier cage.", "Open 6092-MB needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6092-MB; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 460 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.", "Where two 6092 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 6092-MB?", "a": "The SKF 6092 MB measures 460 mm bore × 680 mm OD × 100 mm width (18.11 × 26.772 × 3.937 in), mass about 120000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6092 work?", "a": "The final two digits of 6092 are bore code 92, multiplied by 5 to give 460 mm." }, { "q": "What is the speed rating of 6092-MB?", "a": "SKF lists a 1800 r/min thermal reference speed and a 1500 r/min mechanical limiting speed for 6092 MB; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6092-MB and a same-bore 62-series bearing?", "a": "Section height differs: 6092-MB has a 110 mm radial section and C 582 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 6092-MB?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 680 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "6092-MB", "6092 MB" ], "locale_variants": {} }, { "sku": "61896-MA", "brand": "SKF", "manufacturer_designation": "61896 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 480, "D_mm": 600, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 325, "static_load_kN": 600, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 1900, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 36500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series, the last two digits encode the bore: 61896 carries code 96 = 480 mm (code × 5). The envelope is 480×600×56 mm (18.898×23.622×2.205 in) with a 60.0 mm radial section height, C 325 kN, C0 600 kN and Pu 10.8 kN. The open 61896 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1600 r/min, catalogue mass 36500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives", "hoists and winches" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 61896-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Mount by heating the inner ring (max 120 °C) — driving 61896-MA home through the outer ring or balls brinells the raceways.", "The MA suffix on 61896-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 36500 g quoted mass includes the heavier cage.", "Open 61896-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61896-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 10.8 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 61896 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 61896-MA?", "a": "The SKF 61896 MA measures 480 mm bore × 600 mm OD × 56 mm width (18.898 × 23.622 × 2.205 in), mass about 36500 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61896 work?", "a": "The final two digits of 61896 are bore code 96, multiplied by 5 to give 480 mm." }, { "q": "What is the difference between 61896-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61896-MA has a 60 mm radial section and C 325 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61896-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 600 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61896-MA?", "a": "Catalogue mass is 36500 g for 61896 MA; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "61896", "equiv_brand": "NTN", "level": "partial", "note": "NTN bearing 6896 on the same 480×600×56 mm envelope, but catalogue C/C0 differ (325/600 kN vs 355/540 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": [ "61896-MA", "61896 MA" ], "locale_variants": {} }, { "sku": "61996-MA", "brand": "SKF", "manufacturer_designation": "61996 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 480, "D_mm": 650, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 449, "static_load_kN": 815, "fatigue_load_limit_kN": 14.6, "reference_speed_rpm": 1800, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 74000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series, the last two digits encode the bore: 61996 carries code 96 = 480 mm (code × 5). The envelope is 480×650×78 mm (18.898×25.591×3.071 in) with a 85.0 mm radial section height, C 449 kN, C0 815 kN and Pu 14.6 kN. The open 61996 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1500 r/min, catalogue mass 74000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes", "heavy conveyor drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 480 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 480 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.", "The MA suffix on 61996-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 74000 g quoted mass includes the heavier cage.", "Open 61996-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 61996-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 61996-MA home through the outer ring or balls brinells the raceways.", "A replacement 61996 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 61996 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 61996-MA?", "a": "The SKF 61996 MA measures 480 mm bore × 650 mm OD × 78 mm width (18.898 × 25.591 × 3.071 in), mass about 74000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 61996 work?", "a": "The final two digits of 61996 are bore code 96, multiplied by 5 to give 480 mm." }, { "q": "What is the difference between 61996-MA and a same-bore 62-series bearing?", "a": "Section height differs: 61996-MA has a 85 mm radial section and C 449 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 61996-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 650 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 61996-MA?", "a": "Catalogue mass is 74000 g for 61996 MA; seal and cage executions of the same envelope differ by a few grams." } ], "cross_ref": [ { "equiv_sku": "61996", "equiv_brand": "NTN", "level": "full", "note": "NTN counterpart 6996 on the same 480×650×78 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "61996-MA", "61996 MA" ], "locale_variants": {} }, { "sku": "6096-MB", "brand": "SKF", "manufacturer_designation": "6096 MB", "series": "6000-series", "type": "deep_groove", "d_mm": 480, "D_mm": 700, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 618, "static_load_kN": 1140, "fatigue_load_limit_kN": 20, "reference_speed_rpm": 1700, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series, the last two digits encode the bore: 6096 carries code 96 = 480 mm (code × 5). The envelope is 480×700×100 mm (18.898×27.559×3.937 in) with a 110.0 mm radial section height, C 618 kN, C0 1140 kN and Pu 20 kN. The open 6096 MB carries no shields or seals and relies on application lubrication and external sealing. The MB suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1400 r/min, catalogue mass 125000 g.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Fillet radii must clear the 6096-MB chamfer so the 100 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Fillet radii must clear the 6096-MB chamfer so the 100 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MB suffix on 6096-MB denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 125000 g quoted mass includes the heavier cage.", "Open 6096-MB needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 6096-MB; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 480 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 6096 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 6096-MB?", "a": "The SKF 6096 MB measures 480 mm bore × 700 mm OD × 100 mm width (18.898 × 27.559 × 3.937 in), mass about 125000 g. It is open, with no shields or seals." }, { "q": "How does the bore code in 6096 work?", "a": "The final two digits of 6096 are bore code 96, multiplied by 5 to give 480 mm." }, { "q": "What load can 6096-MB take?", "a": "Catalogue values for 6096 MB: dynamic C 618 kN, static C0 1140 kN, fatigue limit Pu 20 kN. Use C in life calculation and C0 for static checks at 480 mm bore." }, { "q": "What is the speed rating of 6096-MB?", "a": "SKF lists a 1700 r/min thermal reference speed and a 1400 r/min mechanical limiting speed for 6096 MB; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 6096-MB and a same-bore 62-series bearing?", "a": "Section height differs: 6096-MB has a 110 mm radial section and C 618 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "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": [ "6096-MB", "6096 MB" ], "locale_variants": {} }, { "sku": "618-500-MA", "brand": "SKF", "manufacturer_designation": "618/500 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 500, "D_mm": 620, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 332, "static_load_kN": 620, "fatigue_load_limit_kN": 11.2, "reference_speed_rpm": 1800, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 40500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 500 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 500×620×56 mm (19.685×24.409×2.205 in) with a 60.0 mm radial section height, C 332 kN, C0 620 kN and Pu 11.2 kN. The open 618/500 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1500 r/min, catalogue mass 40500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Catalogue ratings for 618-500-MA (C 332 kN, C0 620 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.", "Mount by heating the inner ring (max 120 °C) — driving 618-500-MA home through the outer ring or balls brinells the raceways.", "The MA suffix on 618-500-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 40500 g quoted mass includes the heavier cage.", "Open 618-500-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-500-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 618-500-MA home through the outer ring or balls brinells the raceways.", "A replacement 618/500 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 618-500-MA?", "a": "The SKF 618/500 MA measures 500 mm bore × 620 mm OD × 56 mm width (19.685 × 24.409 × 2.205 in), mass about 40500 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/500 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/500 means 500 mm bore. The site slug 618-500-MA replaces the slash with a hyphen." }, { "q": "Which fits should I use for 618-500-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 620 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 618-500-MA?", "a": "Catalogue mass is 40500 g for 618/500 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 618-500-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "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": [ "618-500-MA", "618/500 MA" ], "locale_variants": {} }, { "sku": "619-500-MA", "brand": "SKF", "manufacturer_designation": "619/500 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 500, "D_mm": 670, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 462, "static_load_kN": 865, "fatigue_load_limit_kN": 15, "reference_speed_rpm": 1700, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 81500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 500 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 500×670×78 mm (19.685×26.378×3.071 in) with a 85.0 mm radial section height, C 462 kN, C0 865 kN and Pu 15 kN. The open 619/500 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1400 r/min, catalogue mass 81500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 619/500-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Catalogue ratings for 619-500-MA (C 462 kN, C0 865 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 MA suffix on 619-500-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 81500 g quoted mass includes the heavier cage.", "Open 619-500-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-500-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 619-500-MA home through the outer ring or balls brinells the raceways.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 619-500-MA?", "a": "The SKF 619/500 MA measures 500 mm bore × 670 mm OD × 78 mm width (19.685 × 26.378 × 3.071 in), mass about 81500 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/500 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/500 means 500 mm bore. The site slug 619-500-MA replaces the slash with a hyphen." }, { "q": "How long can a greased 619-500-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 619-500-MA take?", "a": "Catalogue values for 619/500 MA: dynamic C 462 kN, static C0 865 kN, fatigue limit Pu 15 kN. Use C in life calculation and C0 for static checks at 500 mm bore." }, { "q": "What is the speed rating of 619-500-MA?", "a": "SKF lists a 1700 r/min thermal reference speed and a 1400 r/min mechanical limiting speed for 619/500 MA; real limits also depend on lubrication and fits." } ], "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": [ "619-500-MA", "619/500 MA" ], "locale_variants": {} }, { "sku": "60-500-N1MAS", "brand": "SKF", "manufacturer_designation": "60/500 N1MAS", "series": "6000-series", "type": "deep_groove", "d_mm": 500, "D_mm": 720, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 605, "static_load_kN": 1140, "fatigue_load_limit_kN": 19.6, "reference_speed_rpm": 1600, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 135000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6000-series, the bore is written directly after the slash as 500 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 500×720×100 mm (19.685×28.346×3.937 in) with a 110.0 mm radial section height, C 605 kN, C0 1140 kN and Pu 19.6 kN. The open 60/500 N1MAS carries no shields or seals and relies on application lubrication and external sealing. The N1MAS suffix identifies the machined brass cage execution (special cage variant for this large thin-section size), a separate order number from the pressed-steel version. Limiting speed 1300 r/min, catalogue mass 135000 g.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Fillet radii must clear the 60-500-N1MAS chamfer so the 100 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 720 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 60-500-N1MAS.", "The N1MAS execution of 60-500-N1MAS is a special machined-brass cage variant listed in catalogue 17000 for the largest thin-section sizes; confirm the exact cage feature set with SKF when ordering and servicing.", "The N1MAS suffix on 60-500-N1MAS denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 135000 g quoted mass includes the heavier cage.", "Open 60-500-N1MAS needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 60-500-N1MAS; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 60/500 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 60-500-N1MAS?", "a": "The SKF 60/500 N1MAS measures 500 mm bore × 720 mm OD × 100 mm width (19.685 × 28.346 × 3.937 in), mass about 135000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 60/500 N1MAS?", "a": "The slash writes a bore that falls outside the two-digit code table: 60/500 means 500 mm bore. The site slug 60-500-N1MAS replaces the slash with a hyphen." }, { "q": "What internal clearance does 60-500-N1MAS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 60-500-N1MAS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 60-500-N1MAS take?", "a": "Catalogue values for 60/500 N1MAS: dynamic C 605 kN, static C0 1140 kN, fatigue limit Pu 19.6 kN. Use C in life calculation and C0 for static checks at 500 mm bore." } ], "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": [ "60-500-N1MAS", "60/500 N1MAS" ], "locale_variants": {} }, { "sku": "618-530-MA", "brand": "SKF", "manufacturer_designation": "618/530 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 530, "D_mm": 650, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 332, "static_load_kN": 655, "fatigue_load_limit_kN": 11.2, "reference_speed_rpm": 1700, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 39500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 530 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 530×650×56 mm (20.866×25.591×2.205 in) with a 60.0 mm radial section height, C 332 kN, C0 655 kN and Pu 11.2 kN. The open 618/530 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1400 r/min, catalogue mass 39500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Fillet radii must clear the 618-530-MA chamfer so the 56 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "At 530 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.", "The MA suffix on 618-530-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 39500 g quoted mass includes the heavier cage.", "Open 618-530-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-530-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "The fatigue load limit is 11.2 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Where two 618/530 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "For positions that need relubrication, choose the open execution of 618/530 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 618-530-MA?", "a": "The SKF 618/530 MA measures 530 mm bore × 650 mm OD × 56 mm width (20.866 × 25.591 × 2.205 in), mass about 39500 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/530 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/530 means 530 mm bore. The site slug 618-530-MA replaces the slash with a hyphen." }, { "q": "What load can 618-530-MA take?", "a": "Catalogue values for 618/530 MA: dynamic C 332 kN, static C0 655 kN, fatigue limit Pu 11.2 kN. Use C in life calculation and C0 for static checks at 530 mm bore." }, { "q": "What is the speed rating of 618-530-MA?", "a": "SKF lists a 1700 r/min thermal reference speed and a 1400 r/min mechanical limiting speed for 618/530 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-530-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-530-MA has a 60 mm radial section and C 332 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "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": [ "618-530-MA", "618/530 MA" ], "locale_variants": {} }, { "sku": "619-530-MA", "brand": "SKF", "manufacturer_designation": "619/530 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 530, "D_mm": 710, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 488, "static_load_kN": 930, "fatigue_load_limit_kN": 15.6, "reference_speed_rpm": 1600, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 90500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 530 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 530×710×82 mm (20.866×27.953×3.228 in) with a 90.0 mm radial section height, C 488 kN, C0 930 kN and Pu 15.6 kN. The open 619/530 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1300 r/min, catalogue mass 90500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "The fatigue load limit is 15.6 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 619-530-MA chamfer so the 82 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MA suffix on 619-530-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 90500 g quoted mass includes the heavier cage.", "Open 619-530-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-530-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 710 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 619-530-MA.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 619/530 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 619-530-MA?", "a": "The SKF 619/530 MA measures 530 mm bore × 710 mm OD × 82 mm width (20.866 × 27.953 × 3.228 in), mass about 90500 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/530 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/530 means 530 mm bore. The site slug 619-530-MA replaces the slash with a hyphen." }, { "q": "How heavy is 619-530-MA?", "a": "Catalogue mass is 90500 g for 619/530 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 619-530-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 619-530-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "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": [ "619-530-MA", "619/530 MA" ], "locale_variants": {} }, { "sku": "60-530-N1MAS", "brand": "SKF", "manufacturer_designation": "60/530 N1MAS", "series": "6000-series", "type": "deep_groove", "d_mm": 530, "D_mm": 780, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 650, "static_load_kN": 1270, "fatigue_load_limit_kN": 20.8, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 185000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6000-series, the bore is written directly after the slash as 530 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 530×780×112 mm (20.866×30.709×4.409 in) with a 125.0 mm radial section height, C 650 kN, C0 1270 kN and Pu 20.8 kN. The open 60/530 N1MAS carries no shields or seals and relies on application lubrication and external sealing. The N1MAS suffix identifies the machined brass cage execution (special cage variant for this large thin-section size), a separate order number from the pressed-steel version. Limiting speed 1200 r/min, catalogue mass 185000 g.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Catalogue ratings for 60-530-N1MAS (C 650 kN, C0 1270 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.", "Do not preload 60-530-N1MAS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The N1MAS execution of 60-530-N1MAS is a special machined-brass cage variant listed in catalogue 17000 for the largest thin-section sizes; confirm the exact cage feature set with SKF when ordering and servicing.", "The N1MAS suffix on 60-530-N1MAS denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 185000 g quoted mass includes the heavier cage.", "Open 60-530-N1MAS needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 60-530-N1MAS; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 60-530-N1MAS?", "a": "The SKF 60/530 N1MAS measures 530 mm bore × 780 mm OD × 112 mm width (20.866 × 30.709 × 4.409 in), mass about 185000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 60/530 N1MAS?", "a": "The slash writes a bore that falls outside the two-digit code table: 60/530 means 530 mm bore. The site slug 60-530-N1MAS replaces the slash with a hyphen." }, { "q": "Which fits should I use for 60-530-N1MAS?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 780 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 60-530-N1MAS?", "a": "Catalogue mass is 185000 g for 60/530 N1MAS; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 60-530-N1MAS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "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": [ "60-530-N1MAS", "60/530 N1MAS" ], "locale_variants": {} }, { "sku": "618-560-MA", "brand": "SKF", "manufacturer_designation": "618/560 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 560, "D_mm": 680, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 345, "static_load_kN": 695, "fatigue_load_limit_kN": 11.8, "reference_speed_rpm": 1600, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 42000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 560 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 560×680×56 mm (22.047×26.772×2.205 in) with a 60.0 mm radial section height, C 345 kN, C0 695 kN and Pu 11.8 kN. The open 618/560 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1300 r/min, catalogue mass 42000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 618/560-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Clearance suffixes follow the seal code in the designation stack (e.g. 618/560-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MA suffix on 618-560-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 42000 g quoted mass includes the heavier cage.", "Open 618-560-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-560-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 618-560-MA home through the outer ring or balls brinells the raceways.", "A replacement 618/560 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 618/560 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 618-560-MA?", "a": "The SKF 618/560 MA measures 560 mm bore × 680 mm OD × 56 mm width (22.047 × 26.772 × 2.205 in), mass about 42000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/560 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/560 means 560 mm bore. The site slug 618-560-MA replaces the slash with a hyphen." }, { "q": "What is the speed rating of 618-560-MA?", "a": "SKF lists a 1600 r/min thermal reference speed and a 1300 r/min mechanical limiting speed for 618/560 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-560-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-560-MA has a 60 mm radial section and C 345 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-560-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 680 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "618-560-MA", "618/560 MA" ], "locale_variants": {} }, { "sku": "619-560-MA", "brand": "SKF", "manufacturer_designation": "619/560 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 560, "D_mm": 750, "B_mm": 85, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 494, "static_load_kN": 980, "fatigue_load_limit_kN": 16.3, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 105000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 560 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 560×750×85 mm (22.047×29.528×3.346 in) with a 95.0 mm radial section height, C 494 kN, C0 980 kN and Pu 16.3 kN. The open 619/560 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1200 r/min, catalogue mass 105000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Fillet radii must clear the 619-560-MA chamfer so the 85 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 560 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 MA suffix on 619-560-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 105000 g quoted mass includes the heavier cage.", "Open 619-560-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-560-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 619-560-MA (C 494 kN, C0 980 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.", "For positions that need relubrication, choose the open execution of 619/560 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 619/560 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 619-560-MA?", "a": "The SKF 619/560 MA measures 560 mm bore × 750 mm OD × 85 mm width (22.047 × 29.528 × 3.346 in), mass about 105000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/560 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/560 means 560 mm bore. The site slug 619-560-MA replaces the slash with a hyphen." }, { "q": "What load can 619-560-MA take?", "a": "Catalogue values for 619/560 MA: dynamic C 494 kN, static C0 980 kN, fatigue limit Pu 16.3 kN. Use C in life calculation and C0 for static checks at 560 mm bore." }, { "q": "What is the speed rating of 619-560-MA?", "a": "SKF lists a 1500 r/min thermal reference speed and a 1200 r/min mechanical limiting speed for 619/560 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 619-560-MA and a same-bore 62-series bearing?", "a": "Section height differs: 619-560-MA has a 95 mm radial section and C 494 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "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": [ "619-560-MA", "619/560 MA" ], "locale_variants": {} }, { "sku": "60-560-N1MAS", "brand": "SKF", "manufacturer_designation": "60/560 N1MAS", "series": "6000-series", "type": "deep_groove", "d_mm": 560, "D_mm": 820, "B_mm": 115, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 663, "static_load_kN": 1370, "fatigue_load_limit_kN": 22, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 210000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6000-series, the bore is written directly after the slash as 560 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 560×820×115 mm (22.047×32.283×4.528 in) with a 130.0 mm radial section height, C 663 kN, C0 1370 kN and Pu 22 kN. The open 60/560 N1MAS carries no shields or seals and relies on application lubrication and external sealing. The N1MAS suffix identifies the machined brass cage execution (special cage variant for this large thin-section size), a separate order number from the pressed-steel version. Limiting speed 1200 r/min, catalogue mass 210000 g.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 560 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 60-560-N1MAS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The N1MAS execution of 60-560-N1MAS is a special machined-brass cage variant listed in catalogue 17000 for the largest thin-section sizes; confirm the exact cage feature set with SKF when ordering and servicing.", "The N1MAS suffix on 60-560-N1MAS denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 210000 g quoted mass includes the heavier cage.", "Open 60-560-N1MAS needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 60-560-N1MAS; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "For positions that need relubrication, choose the open execution of 60/560 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Where two 60/560 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 60-560-N1MAS?", "a": "The SKF 60/560 N1MAS measures 560 mm bore × 820 mm OD × 115 mm width (22.047 × 32.283 × 4.528 in), mass about 210000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 60/560 N1MAS?", "a": "The slash writes a bore that falls outside the two-digit code table: 60/560 means 560 mm bore. The site slug 60-560-N1MAS replaces the slash with a hyphen." }, { "q": "Which fits should I use for 60-560-N1MAS?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 820 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 60-560-N1MAS?", "a": "Catalogue mass is 210000 g for 60/560 N1MAS; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 60-560-N1MAS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "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": [ "60-560-N1MAS", "60/560 N1MAS" ], "locale_variants": {} }, { "sku": "618-600-MA", "brand": "SKF", "manufacturer_designation": "618/600 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 600, "D_mm": 730, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 364, "static_load_kN": 765, "fatigue_load_limit_kN": 12.5, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 52000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 600 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 600×730×60 mm (23.622×28.74×2.362 in) with a 65.0 mm radial section height, C 364 kN, C0 765 kN and Pu 12.5 kN. The open 618/600 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1200 r/min, catalogue mass 52000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 600 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 618-600-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The MA suffix on 618-600-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 52000 g quoted mass includes the heavier cage.", "Open 618-600-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-600-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 618-600-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 618/600 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 618-600-MA?", "a": "The SKF 618/600 MA measures 600 mm bore × 730 mm OD × 60 mm width (23.622 × 28.74 × 2.362 in), mass about 52000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/600 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/600 means 600 mm bore. The site slug 618-600-MA replaces the slash with a hyphen." }, { "q": "What internal clearance does 618-600-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 618-600-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 618-600-MA take?", "a": "Catalogue values for 618/600 MA: dynamic C 364 kN, static C0 765 kN, fatigue limit Pu 12.5 kN. Use C in life calculation and C0 for static checks at 600 mm bore." } ], "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": [ "618-600-MA", "618/600 MA" ], "locale_variants": {} }, { "sku": "619-600-MA", "brand": "SKF", "manufacturer_designation": "619/600 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 600, "D_mm": 800, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 585, "static_load_kN": 1220, "fatigue_load_limit_kN": 19.6, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 600 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 600×800×90 mm (23.622×31.496×3.543 in) with a 100.0 mm radial section height, C 585 kN, C0 1220 kN and Pu 19.6 kN. The open 619/600 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1100 r/min, catalogue mass 125000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "At 600 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 619-600-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The MA suffix on 619-600-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 125000 g quoted mass includes the heavier cage.", "Open 619-600-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-600-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 600 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.", "A replacement 619/600 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 619-600-MA?", "a": "The SKF 619/600 MA measures 600 mm bore × 800 mm OD × 90 mm width (23.622 × 31.496 × 3.543 in), mass about 125000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/600 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/600 means 600 mm bore. The site slug 619-600-MA replaces the slash with a hyphen." }, { "q": "How long can a greased 619-600-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 619-600-MA take?", "a": "Catalogue values for 619/600 MA: dynamic C 585 kN, static C0 1220 kN, fatigue limit Pu 19.6 kN. Use C in life calculation and C0 for static checks at 600 mm bore." }, { "q": "What is the speed rating of 619-600-MA?", "a": "SKF lists a 1400 r/min thermal reference speed and a 1100 r/min mechanical limiting speed for 619/600 MA; real limits also depend on lubrication and fits." } ], "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": [ "619-600-MA", "619/600 MA" ], "locale_variants": {} }, { "sku": "60-600-MA", "brand": "SKF", "manufacturer_designation": "60/600 MA", "series": "6000-series", "type": "deep_groove", "d_mm": 600, "D_mm": 870, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 728, "static_load_kN": 1500, "fatigue_load_limit_kN": 23.6, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 230000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6000-series, the bore is written directly after the slash as 600 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 600×870×118 mm (23.622×34.252×4.646 in) with a 135.0 mm radial section height, C 728 kN, C0 1500 kN and Pu 23.6 kN. The open 60/600 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1100 r/min, catalogue mass 230000 g.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 870 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 60-600-MA.", "The fatigue load limit is 23.6 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 60-600-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 230000 g quoted mass includes the heavier cage.", "Open 60-600-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 60-600-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 870 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 60-600-MA.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 60/600 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 60-600-MA?", "a": "The SKF 60/600 MA measures 600 mm bore × 870 mm OD × 118 mm width (23.622 × 34.252 × 4.646 in), mass about 230000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 60/600 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 60/600 means 600 mm bore. The site slug 60-600-MA replaces the slash with a hyphen." }, { "q": "What internal clearance does 60-600-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 60-600-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 60-600-MA take?", "a": "Catalogue values for 60/600 MA: dynamic C 728 kN, static C0 1500 kN, fatigue limit Pu 23.6 kN. Use C in life calculation and C0 for static checks at 600 mm bore." } ], "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": [ "60-600-MA", "60/600 MA" ], "locale_variants": {} }, { "sku": "618-630-MA", "brand": "SKF", "manufacturer_designation": "618/630 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 630, "D_mm": 780, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 442, "static_load_kN": 965, "fatigue_load_limit_kN": 15.3, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 73000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 630 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 630×780×69 mm (24.803×30.709×2.717 in) with a 75.0 mm radial section height, C 442 kN, C0 965 kN and Pu 15.3 kN. The open 618/630 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1100 r/min, catalogue mass 73000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 780 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 618-630-MA.", "Do not preload 618-630-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The MA suffix on 618-630-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 73000 g quoted mass includes the heavier cage.", "Open 618-630-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-630-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 630 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.", "A replacement 618/630 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 618-630-MA?", "a": "The SKF 618/630 MA measures 630 mm bore × 780 mm OD × 69 mm width (24.803 × 30.709 × 2.717 in), mass about 73000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/630 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/630 means 630 mm bore. The site slug 618-630-MA replaces the slash with a hyphen." }, { "q": "What is the speed rating of 618-630-MA?", "a": "SKF lists a 1400 r/min thermal reference speed and a 1100 r/min mechanical limiting speed for 618/630 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-630-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-630-MA has a 75 mm radial section and C 442 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-630-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 780 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "618-630-MA", "618/630 MA" ], "locale_variants": {} }, { "sku": "619-630", "brand": "SKF", "manufacturer_designation": "619/630", "series": "61900-series", "type": "deep_groove", "d_mm": 630, "D_mm": 850, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 624, "static_load_kN": 1340, "fatigue_load_limit_kN": 21.2, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 160000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 630 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 630×850×100 mm (24.803×33.465×3.937 in) with a 110.0 mm radial section height, C 624 kN, C0 1340 kN and Pu 21.2 kN. The open 619/630 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 1100 r/min, catalogue mass 160000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 850 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 619-630.", "The fatigue load limit is 21.2 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Open 619-630 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-630; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 619-630 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. 619/630-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 619/630 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 619-630?", "a": "The SKF 619/630 measures 630 mm bore × 850 mm OD × 100 mm width (24.803 × 33.465 × 3.937 in), mass about 160000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/630?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/630 means 630 mm bore. The site slug 619-630 replaces the slash with a hyphen." }, { "q": "What load can 619-630 take?", "a": "Catalogue values for 619/630: dynamic C 624 kN, static C0 1340 kN, fatigue limit Pu 21.2 kN. Use C in life calculation and C0 for static checks at 630 mm bore." }, { "q": "What is the speed rating of 619-630?", "a": "SKF lists a 1300 r/min thermal reference speed and a 1100 r/min mechanical limiting speed for 619/630; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 619-630 and a same-bore 62-series bearing?", "a": "Section height differs: 619-630 has a 110 mm radial section and C 624 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "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": [ "619-630", "619/630" ], "locale_variants": {} }, { "sku": "60-630", "brand": "SKF", "manufacturer_designation": "60/630", "series": "6000-series", "type": "deep_groove", "d_mm": 630, "D_mm": 920, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 819, "static_load_kN": 1760, "fatigue_load_limit_kN": 27, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 285000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6000-series, the bore is written directly after the slash as 630 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 630×920×128 mm (24.803×36.22×5.039 in) with a 145.0 mm radial section height, C 819 kN, C0 1760 kN and Pu 27 kN. The open 60/630 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 1000 r/min, catalogue mass 285000 g.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "At 630 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 630 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.", "Open 60-630 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 60-630; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 60-630 home through the outer ring or balls brinells the raceways.", "The fatigue load limit is 27 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 60/630 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 60-630?", "a": "The SKF 60/630 measures 630 mm bore × 920 mm OD × 128 mm width (24.803 × 36.22 × 5.039 in), mass about 285000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 60/630?", "a": "The slash writes a bore that falls outside the two-digit code table: 60/630 means 630 mm bore. The site slug 60-630 replaces the slash with a hyphen." }, { "q": "What is the difference between 60-630 and a same-bore 62-series bearing?", "a": "Section height differs: 60-630 has a 145 mm radial section and C 819 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 60-630?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 920 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 60-630?", "a": "Catalogue mass is 285000 g for 60/630; seal and cage executions of the same envelope differ by a few grams." } ], "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": [ "60-630", "60/630" ], "locale_variants": {} }, { "sku": "618-670-MA", "brand": "SKF", "manufacturer_designation": "618/670 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 670, "D_mm": 820, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 442, "static_load_kN": 1000, "fatigue_load_limit_kN": 15.6, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 83500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 670 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 670×820×69 mm (26.378×32.283×2.717 in) with a 75.0 mm radial section height, C 442 kN, C0 1000 kN and Pu 15.6 kN. The open 618/670 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1100 r/min, catalogue mass 83500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 618/670-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Fillet radii must clear the 618-670-MA chamfer so the 69 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MA suffix on 618-670-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 83500 g quoted mass includes the heavier cage.", "Open 618-670-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-670-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 618/670-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "A replacement 618/670 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 618/670 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 618-670-MA?", "a": "The SKF 618/670 MA measures 670 mm bore × 820 mm OD × 69 mm width (26.378 × 32.283 × 2.717 in), mass about 83500 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/670 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/670 means 670 mm bore. The site slug 618-670-MA replaces the slash with a hyphen." }, { "q": "What load can 618-670-MA take?", "a": "Catalogue values for 618/670 MA: dynamic C 442 kN, static C0 1000 kN, fatigue limit Pu 15.6 kN. Use C in life calculation and C0 for static checks at 670 mm bore." }, { "q": "What is the speed rating of 618-670-MA?", "a": "SKF lists a 1300 r/min thermal reference speed and a 1100 r/min mechanical limiting speed for 618/670 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-670-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-670-MA has a 75 mm radial section and C 442 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "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": [ "618-670-MA", "618/670 MA" ], "locale_variants": {} }, { "sku": "619-670-MA", "brand": "SKF", "manufacturer_designation": "619/670 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 670, "D_mm": 900, "B_mm": 103, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 676, "static_load_kN": 1500, "fatigue_load_limit_kN": 22.4, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 192000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 670 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 670×900×103 mm (26.378×35.433×4.055 in) with a 115.0 mm radial section height, C 676 kN, C0 1500 kN and Pu 22.4 kN. The open 619/670 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1000 r/min, catalogue mass 192000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "The fatigue load limit is 22.4 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 619-670-MA chamfer so the 103 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MA suffix on 619-670-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 192000 g quoted mass includes the heavier cage.", "Open 619-670-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-670-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 670 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "Where two 619/670 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 619-670-MA?", "a": "The SKF 619/670 MA measures 670 mm bore × 900 mm OD × 103 mm width (26.378 × 35.433 × 4.055 in), mass about 192000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/670 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/670 means 670 mm bore. The site slug 619-670-MA replaces the slash with a hyphen." }, { "q": "Which fits should I use for 619-670-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 900 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 619-670-MA?", "a": "Catalogue mass is 192000 g for 619/670 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 619-670-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "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": [ "619-670-MA", "619/670 MA" ], "locale_variants": {} }, { "sku": "60-670-N1MAS", "brand": "SKF", "manufacturer_designation": "60/670 N1MAS", "series": "6000-series", "type": "deep_groove", "d_mm": 670, "D_mm": 980, "B_mm": 136, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 904, "static_load_kN": 2040, "fatigue_load_limit_kN": 30, "reference_speed_rpm": 1100, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 345000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6000-series, the bore is written directly after the slash as 670 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 670×980×136 mm (26.378×38.583×5.354 in) with a 155.0 mm radial section height, C 904 kN, C0 2040 kN and Pu 30 kN. The open 60/670 N1MAS carries no shields or seals and relies on application lubrication and external sealing. The N1MAS suffix identifies the machined brass cage execution (special cage variant for this large thin-section size), a separate order number from the pressed-steel version. Limiting speed 900 r/min, catalogue mass 345000 g.", "applications": [ "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "The fatigue load limit is 30 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Mount by heating the inner ring (max 120 °C) — driving 60-670-N1MAS home through the outer ring or balls brinells the raceways.", "The N1MAS execution of 60-670-N1MAS is a special machined-brass cage variant listed in catalogue 17000 for the largest thin-section sizes; confirm the exact cage feature set with SKF when ordering and servicing.", "The N1MAS suffix on 60-670-N1MAS denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 345000 g quoted mass includes the heavier cage.", "Open 60-670-N1MAS needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 60-670-N1MAS; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Where two 60/670 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 60-670-N1MAS?", "a": "The SKF 60/670 N1MAS measures 670 mm bore × 980 mm OD × 136 mm width (26.378 × 38.583 × 5.354 in), mass about 345000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 60/670 N1MAS?", "a": "The slash writes a bore that falls outside the two-digit code table: 60/670 means 670 mm bore. The site slug 60-670-N1MAS replaces the slash with a hyphen." }, { "q": "What load can 60-670-N1MAS take?", "a": "Catalogue values for 60/670 N1MAS: dynamic C 904 kN, static C0 2040 kN, fatigue limit Pu 30 kN. Use C in life calculation and C0 for static checks at 670 mm bore." }, { "q": "What is the speed rating of 60-670-N1MAS?", "a": "SKF lists a 1100 r/min thermal reference speed and a 900 r/min mechanical limiting speed for 60/670 N1MAS; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 60-670-N1MAS and a same-bore 62-series bearing?", "a": "Section height differs: 60-670-N1MAS has a 155 mm radial section and C 904 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "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": [ "60-670-N1MAS", "60/670 N1MAS" ], "locale_variants": {} }, { "sku": "618-710-MA", "brand": "SKF", "manufacturer_designation": "618/710 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 710, "D_mm": 870, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 475, "static_load_kN": 1100, "fatigue_load_limit_kN": 16.6, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 93500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 710 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 710×870×74 mm (27.953×34.252×2.913 in) with a 80.0 mm radial section height, C 475 kN, C0 1100 kN and Pu 16.6 kN. The open 618/710 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 1000 r/min, catalogue mass 93500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives", "large industrial gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Clearance suffixes follow the seal code in the designation stack (e.g. 618/710-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "At 710 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.", "The MA suffix on 618-710-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 93500 g quoted mass includes the heavier cage.", "Open 618-710-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-710-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 710 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 618-710-MA?", "a": "The SKF 618/710 MA measures 710 mm bore × 870 mm OD × 74 mm width (27.953 × 34.252 × 2.913 in), mass about 93500 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/710 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/710 means 710 mm bore. The site slug 618-710-MA replaces the slash with a hyphen." }, { "q": "What is the speed rating of 618-710-MA?", "a": "SKF lists a 1200 r/min thermal reference speed and a 1000 r/min mechanical limiting speed for 618/710 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-710-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-710-MA has a 80 mm radial section and C 475 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-710-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 870 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "618-710-MA", "618/710 MA" ], "locale_variants": {} }, { "sku": "619-710-MA", "brand": "SKF", "manufacturer_designation": "619/710 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 710, "D_mm": 950, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 663, "static_load_kN": 1500, "fatigue_load_limit_kN": 22, "reference_speed_rpm": 1100, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 220000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 710 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 710×950×106 mm (27.953×37.402×4.173 in) with a 120.0 mm radial section height, C 663 kN, C0 1500 kN and Pu 22 kN. The open 619/710 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 900 r/min, catalogue mass 220000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Deep-groove geometry tolerates only minutes of misalignment; if the 950 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 619-710-MA.", "At 710 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.", "The MA suffix on 619-710-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 220000 g quoted mass includes the heavier cage.", "Open 619-710-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-710-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 950 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 619-710-MA.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "For positions that need relubrication, choose the open execution of 619/710 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 619-710-MA?", "a": "The SKF 619/710 MA measures 710 mm bore × 950 mm OD × 106 mm width (27.953 × 37.402 × 4.173 in), mass about 220000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/710 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/710 means 710 mm bore. The site slug 619-710-MA replaces the slash with a hyphen." }, { "q": "What is the speed rating of 619-710-MA?", "a": "SKF lists a 1100 r/min thermal reference speed and a 900 r/min mechanical limiting speed for 619/710 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 619-710-MA and a same-bore 62-series bearing?", "a": "Section height differs: 619-710-MA has a 120 mm radial section and C 663 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 619-710-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 950 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "619-710-MA", "619/710 MA" ], "locale_variants": {} }, { "sku": "60-710-MA", "brand": "SKF", "manufacturer_designation": "60/710 MA", "series": "6000-series", "type": "deep_groove", "d_mm": 710, "D_mm": 1030, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 956, "static_load_kN": 2200, "fatigue_load_limit_kN": 31.5, "reference_speed_rpm": 1000, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 382000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6000-series, the bore is written directly after the slash as 710 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 710×1030×140 mm (27.953×40.551×5.512 in) with a 160.0 mm radial section height, C 956 kN, C0 2200 kN and Pu 31.5 kN. The open 60/710 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 850 r/min, catalogue mass 382000 g.", "applications": [ "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Catalogue ratings for 60-710-MA (C 956 kN, C0 2200 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. 60/710-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MA suffix on 60-710-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 382000 g quoted mass includes the heavier cage.", "Open 60-710-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 60-710-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 1030 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 60-710-MA.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 60-710-MA?", "a": "The SKF 60/710 MA measures 710 mm bore × 1030 mm OD × 140 mm width (27.953 × 40.551 × 5.512 in), mass about 382000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 60/710 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 60/710 means 710 mm bore. The site slug 60-710-MA replaces the slash with a hyphen." }, { "q": "What internal clearance does 60-710-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 60-710-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 60-710-MA take?", "a": "Catalogue values for 60/710 MA: dynamic C 956 kN, static C0 2200 kN, fatigue limit Pu 31.5 kN. Use C in life calculation and C0 for static checks at 710 mm bore." } ], "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": [ "60-710-MA", "60/710 MA" ], "locale_variants": {} }, { "sku": "618-750-MA", "brand": "SKF", "manufacturer_designation": "618/750 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 750, "D_mm": 920, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 527, "static_load_kN": 1250, "fatigue_load_limit_kN": 18.3, "reference_speed_rpm": 1100, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 110000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 750 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 750×920×78 mm (29.528×36.22×3.071 in) with a 85.0 mm radial section height, C 527 kN, C0 1250 kN and Pu 18.3 kN. The open 618/750 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 900 r/min, catalogue mass 110000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Fillet radii must clear the 618-750-MA chamfer so the 78 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 18.3 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 618-750-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 110000 g quoted mass includes the heavier cage.", "Open 618-750-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-750-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Do not preload 618-750-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "For positions that need relubrication, choose the open execution of 618/750 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 618/750 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 618-750-MA?", "a": "The SKF 618/750 MA measures 750 mm bore × 920 mm OD × 78 mm width (29.528 × 36.22 × 3.071 in), mass about 110000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/750 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/750 means 750 mm bore. The site slug 618-750-MA replaces the slash with a hyphen." }, { "q": "How heavy is 618-750-MA?", "a": "Catalogue mass is 110000 g for 618/750 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 618-750-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 618-750-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "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": [ "618-750-MA", "618/750 MA" ], "locale_variants": {} }, { "sku": "619-750-MA", "brand": "SKF", "manufacturer_designation": "619/750 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 750, "D_mm": 1000, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 761, "static_load_kN": 1800, "fatigue_load_limit_kN": 25.5, "reference_speed_rpm": 1000, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 255000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 750 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 750×1000×112 mm (29.528×39.37×4.409 in) with a 125.0 mm radial section height, C 761 kN, C0 1800 kN and Pu 25.5 kN. The open 619/750 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 850 r/min, catalogue mass 255000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "The fatigue load limit is 25.5 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 25.5 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 619-750-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 255000 g quoted mass includes the heavier cage.", "Open 619-750-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-750-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 619-750-MA (C 761 kN, C0 1800 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.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 619-750-MA?", "a": "The SKF 619/750 MA measures 750 mm bore × 1000 mm OD × 112 mm width (29.528 × 39.37 × 4.409 in), mass about 255000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/750 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/750 means 750 mm bore. The site slug 619-750-MA replaces the slash with a hyphen." }, { "q": "How long can a greased 619-750-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 619-750-MA take?", "a": "Catalogue values for 619/750 MA: dynamic C 761 kN, static C0 1800 kN, fatigue limit Pu 25.5 kN. Use C in life calculation and C0 for static checks at 750 mm bore." }, { "q": "What is the speed rating of 619-750-MA?", "a": "SKF lists a 1000 r/min thermal reference speed and a 850 r/min mechanical limiting speed for 619/750 MA; real limits also depend on lubrication and fits." } ], "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": [ "619-750-MA", "619/750 MA" ], "locale_variants": {} }, { "sku": "60-750-MA", "brand": "SKF", "manufacturer_designation": "60/750 MA", "series": "6000-series", "type": "deep_groove", "d_mm": 750, "D_mm": 1090, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 995, "static_load_kN": 2360, "fatigue_load_limit_kN": 33.5, "reference_speed_rpm": 950, "limiting_speed_rpm": 800, "max_rpm": 800, "weight_g": 485000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6000-series, the bore is written directly after the slash as 750 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 750×1090×150 mm (29.528×42.913×5.906 in) with a 170.0 mm radial section height, C 995 kN, C0 2360 kN and Pu 33.5 kN. The open 60/750 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 800 r/min, catalogue mass 485000 g.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 750 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 60-750-MA home through the outer ring or balls brinells the raceways.", "The MA suffix on 60-750-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 485000 g quoted mass includes the heavier cage.", "Open 60-750-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 60-750-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 60-750-MA home through the outer ring or balls brinells the raceways.", "A replacement 60/750 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "Where two 60/750 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set." ], "faq": [ { "q": "What are the dimensions of 60-750-MA?", "a": "The SKF 60/750 MA measures 750 mm bore × 1090 mm OD × 150 mm width (29.528 × 42.913 × 5.906 in), mass about 485000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 60/750 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 60/750 means 750 mm bore. The site slug 60-750-MA replaces the slash with a hyphen." }, { "q": "What is the difference between 60-750-MA and a same-bore 62-series bearing?", "a": "Section height differs: 60-750-MA has a 170 mm radial section and C 995 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 60-750-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 1090 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 60-750-MA?", "a": "Catalogue mass is 485000 g for 60/750 MA; seal and cage executions of the same envelope differ by a few grams." } ], "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": [ "60-750-MA", "60/750 MA" ], "locale_variants": {} }, { "sku": "618-800-MA", "brand": "SKF", "manufacturer_designation": "618/800 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 800, "D_mm": 980, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 559, "static_load_kN": 1370, "fatigue_load_limit_kN": 19.3, "reference_speed_rpm": 1000, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 130000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 800 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 800×980×82 mm (31.496×38.583×3.228 in) with a 90.0 mm radial section height, C 559 kN, C0 1370 kN and Pu 19.3 kN. The open 618/800 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 850 r/min, catalogue mass 130000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Fillet radii must clear the 618-800-MA chamfer so the 82 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload 618-800-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The MA suffix on 618-800-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 130000 g quoted mass includes the heavier cage.", "Open 618-800-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-800-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 618/800-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 618/800 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 618-800-MA?", "a": "The SKF 618/800 MA measures 800 mm bore × 980 mm OD × 82 mm width (31.496 × 38.583 × 3.228 in), mass about 130000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/800 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/800 means 800 mm bore. The site slug 618-800-MA replaces the slash with a hyphen." }, { "q": "How heavy is 618-800-MA?", "a": "Catalogue mass is 130000 g for 618/800 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 618-800-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 618-800-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." } ], "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": [ "618-800-MA", "618/800 MA" ], "locale_variants": {} }, { "sku": "619-800-MA", "brand": "SKF", "manufacturer_designation": "619/800 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 800, "D_mm": 1060, "B_mm": 115, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 832, "static_load_kN": 2040, "fatigue_load_limit_kN": 28.5, "reference_speed_rpm": 950, "limiting_speed_rpm": 800, "max_rpm": 800, "weight_g": 275000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 800 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 800×1060×115 mm (31.496×41.732×4.528 in) with a 130.0 mm radial section height, C 832 kN, C0 2040 kN and Pu 28.5 kN. The open 619/800 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 800 r/min, catalogue mass 275000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "mill and kiln auxiliaries", "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Catalogue ratings for 619-800-MA (C 832 kN, C0 2040 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.", "Deep-groove geometry tolerates only minutes of misalignment; if the 1060 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 619-800-MA.", "The MA suffix on 619-800-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 275000 g quoted mass includes the heavier cage.", "Open 619-800-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-800-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 619-800-MA (C 832 kN, C0 2040 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.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 619-800-MA?", "a": "The SKF 619/800 MA measures 800 mm bore × 1060 mm OD × 115 mm width (31.496 × 41.732 × 4.528 in), mass about 275000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/800 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/800 means 800 mm bore. The site slug 619-800-MA replaces the slash with a hyphen." }, { "q": "How long can a greased 619-800-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 619-800-MA take?", "a": "Catalogue values for 619/800 MA: dynamic C 832 kN, static C0 2040 kN, fatigue limit Pu 28.5 kN. Use C in life calculation and C0 for static checks at 800 mm bore." }, { "q": "What is the speed rating of 619-800-MA?", "a": "SKF lists a 950 r/min thermal reference speed and a 800 r/min mechanical limiting speed for 619/800 MA; real limits also depend on lubrication and fits." } ], "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": [ "619-800-MA", "619/800 MA" ], "locale_variants": {} }, { "sku": "60-800-N1MAS", "brand": "SKF", "manufacturer_designation": "60/800 N1MAS", "series": "6000-series", "type": "deep_groove", "d_mm": 800, "D_mm": 1150, "B_mm": 155, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1010, "static_load_kN": 2550, "fatigue_load_limit_kN": 34.5, "reference_speed_rpm": 900, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 523000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 6000-series, the bore is written directly after the slash as 800 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 800×1150×155 mm (31.496×45.276×6.102 in) with a 175.0 mm radial section height, C 1010 kN, C0 2550 kN and Pu 34.5 kN. The open 60/800 N1MAS carries no shields or seals and relies on application lubrication and external sealing. The N1MAS suffix identifies the machined brass cage execution (special cage variant for this large thin-section size), a separate order number from the pressed-steel version. Limiting speed 750 r/min, catalogue mass 523000 g.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "electrical pitting in VFD-driven motors without shaft grounding" ], "pitfalls": [ "Do not preload 60-800-N1MAS 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 34.5 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The N1MAS execution of 60-800-N1MAS is a special machined-brass cage variant listed in catalogue 17000 for the largest thin-section sizes; confirm the exact cage feature set with SKF when ordering and servicing.", "The N1MAS suffix on 60-800-N1MAS denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 523000 g quoted mass includes the heavier cage.", "Open 60-800-N1MAS needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 60-800-N1MAS; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 60-800-N1MAS?", "a": "The SKF 60/800 N1MAS measures 800 mm bore × 1150 mm OD × 155 mm width (31.496 × 45.276 × 6.102 in), mass about 523000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 60/800 N1MAS?", "a": "The slash writes a bore that falls outside the two-digit code table: 60/800 means 800 mm bore. The site slug 60-800-N1MAS replaces the slash with a hyphen." }, { "q": "What internal clearance does 60-800-N1MAS have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 60-800-N1MAS be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 60-800-N1MAS take?", "a": "Catalogue values for 60/800 N1MAS: dynamic C 1010 kN, static C0 2550 kN, fatigue limit Pu 34.5 kN. Use C in life calculation and C0 for static checks at 800 mm bore." } ], "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": [ "60-800-N1MAS", "60/800 N1MAS" ], "locale_variants": {} }, { "sku": "618-850-MA", "brand": "SKF", "manufacturer_designation": "618/850 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 850, "D_mm": 1030, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 559, "static_load_kN": 1430, "fatigue_load_limit_kN": 19.6, "reference_speed_rpm": 950, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 140000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 850 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 850×1030×82 mm (33.465×40.551×3.228 in) with a 90.0 mm radial section height, C 559 kN, C0 1430 kN and Pu 19.6 kN. The open 618/850 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 750 r/min, catalogue mass 140000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "large industrial gearboxes", "heavy conveyor drives", "hoists and winches", "industrial fans and blowers" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 850 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 1030 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 618-850-MA.", "The MA suffix on 618-850-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 140000 g quoted mass includes the heavier cage.", "Open 618-850-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-850-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 1030 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 618-850-MA.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "A replacement 618/850 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 618-850-MA?", "a": "The SKF 618/850 MA measures 850 mm bore × 1030 mm OD × 82 mm width (33.465 × 40.551 × 3.228 in), mass about 140000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/850 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/850 means 850 mm bore. The site slug 618-850-MA replaces the slash with a hyphen." }, { "q": "What is the speed rating of 618-850-MA?", "a": "SKF lists a 950 r/min thermal reference speed and a 750 r/min mechanical limiting speed for 618/850 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-850-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-850-MA has a 90 mm radial section and C 559 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-850-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 1030 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "618-850-MA", "618/850 MA" ], "locale_variants": {} }, { "sku": "619-850-MA", "brand": "SKF", "manufacturer_designation": "619/850 MA", "series": "61900-series", "type": "deep_groove", "d_mm": 850, "D_mm": 1120, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 852, "static_load_kN": 2120, "fatigue_load_limit_kN": 28.5, "reference_speed_rpm": 850, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 320000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61900-series, the bore is written directly after the slash as 850 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 850×1120×118 mm (33.465×44.094×4.646 in) with a 135.0 mm radial section height, C 852 kN, C0 2120 kN and Pu 28.5 kN. The open 619/850 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 750 r/min, catalogue mass 320000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 619-850-MA home through the outer ring or balls brinells the raceways.", "Do not preload 619-850-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "The MA suffix on 619-850-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 320000 g quoted mass includes the heavier cage.", "Open 619-850-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 619-850-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 619-850-MA chamfer so the 118 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 619/850 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed." ], "faq": [ { "q": "What are the dimensions of 619-850-MA?", "a": "The SKF 619/850 MA measures 850 mm bore × 1120 mm OD × 118 mm width (33.465 × 44.094 × 4.646 in), mass about 320000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 619/850 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 619/850 means 850 mm bore. The site slug 619-850-MA replaces the slash with a hyphen." }, { "q": "What internal clearance does 619-850-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." }, { "q": "How long can a greased 619-850-MA be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 619-850-MA take?", "a": "Catalogue values for 619/850 MA: dynamic C 852 kN, static C0 2120 kN, fatigue limit Pu 28.5 kN. Use C in life calculation and C0 for static checks at 850 mm bore." } ], "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": [ "619-850-MA", "619/850 MA" ], "locale_variants": {} }, { "sku": "618-900-MA", "brand": "SKF", "manufacturer_designation": "618/900 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 900, "D_mm": 1090, "B_mm": 85, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 618, "static_load_kN": 1600, "fatigue_load_limit_kN": 21.6, "reference_speed_rpm": 850, "limiting_speed_rpm": 700, "max_rpm": 700, "weight_g": 167000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 900 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 900×1090×85 mm (35.433×42.913×3.346 in) with a 95.0 mm radial section height, C 618 kN, C0 1600 kN and Pu 21.6 kN. The open 618/900 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 700 r/min, catalogue mass 167000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Do not preload 618-900-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Mount by heating the inner ring (max 120 °C) — driving 618-900-MA home through the outer ring or balls brinells the raceways.", "The MA suffix on 618-900-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 167000 g quoted mass includes the heavier cage.", "Open 618-900-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-900-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "At 900 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.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 618-900-MA?", "a": "The SKF 618/900 MA measures 900 mm bore × 1090 mm OD × 85 mm width (35.433 × 42.913 × 3.346 in), mass about 167000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/900 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/900 means 900 mm bore. The site slug 618-900-MA replaces the slash with a hyphen." }, { "q": "What is the speed rating of 618-900-MA?", "a": "SKF lists a 850 r/min thermal reference speed and a 700 r/min mechanical limiting speed for 618/900 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-900-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-900-MA has a 95 mm radial section and C 618 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-900-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 1090 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "618-900-MA", "618/900 MA" ], "locale_variants": {} }, { "sku": "618-950-MA", "brand": "SKF", "manufacturer_designation": "618/950 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 950, "D_mm": 1150, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 637, "static_load_kN": 1730, "fatigue_load_limit_kN": 22.4, "reference_speed_rpm": 800, "limiting_speed_rpm": 670, "max_rpm": 670, "weight_g": 197000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 950 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 950×1150×90 mm (37.402×45.276×3.543 in) with a 100.0 mm radial section height, C 637 kN, C0 1730 kN and Pu 22.4 kN. The open 618/950 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 670 r/min, catalogue mass 197000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "pulp and paper machinery", "marine deck machinery", "crusher auxiliary drives", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "electrical pitting in VFD-driven motors without shaft grounding", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Catalogue ratings for 618-950-MA (C 637 kN, C0 1730 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 22.4 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 618-950-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 197000 g quoted mass includes the heavier cage.", "Open 618-950-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-950-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Clearance suffixes follow the seal code in the designation stack (e.g. 618/950-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "For positions that need relubrication, choose the open execution of 618/950 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units." ], "faq": [ { "q": "What are the dimensions of 618-950-MA?", "a": "The SKF 618/950 MA measures 950 mm bore × 1150 mm OD × 90 mm width (37.402 × 45.276 × 3.543 in), mass about 197000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/950 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/950 means 950 mm bore. The site slug 618-950-MA replaces the slash with a hyphen." }, { "q": "What is the difference between 618-950-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-950-MA has a 100 mm radial section and C 637 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-950-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 1150 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 618-950-MA?", "a": "Catalogue mass is 197000 g for 618/950 MA; seal and cage executions of the same envelope differ by a few grams." } ], "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": [ "618-950-MA", "618/950 MA" ], "locale_variants": {} }, { "sku": "618-1000-MA", "brand": "SKF", "manufacturer_designation": "618/1000 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 1000, "D_mm": 1220, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 637, "static_load_kN": 1800, "fatigue_load_limit_kN": 22.8, "reference_speed_rpm": 750, "limiting_speed_rpm": 600, "max_rpm": 600, "weight_g": 245000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 1000 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 1000×1220×100 mm (39.37×48.031×3.937 in) with a 110.0 mm radial section height, C 637 kN, C0 1800 kN and Pu 22.8 kN. The open 618/1000 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 600 r/min, catalogue mass 245000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries", "pulp and paper machinery" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Catalogue ratings for 618-1000-MA (C 637 kN, C0 1800 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 618-1000-MA chamfer so the 100 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MA suffix on 618-1000-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 245000 g quoted mass includes the heavier cage.", "Open 618-1000-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-1000-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Deep-groove geometry tolerates only minutes of misalignment; if the 1220 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 618-1000-MA.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 618-1000-MA?", "a": "The SKF 618/1000 MA measures 1000 mm bore × 1220 mm OD × 100 mm width (39.37 × 48.031 × 3.937 in), mass about 245000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/1000 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/1000 means 1000 mm bore. The site slug 618-1000-MA replaces the slash with a hyphen." }, { "q": "Which fits should I use for 618-1000-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 1220 mm housing; reverse the interference if the outer ring rotates." }, { "q": "How heavy is 618-1000-MA?", "a": "Catalogue mass is 245000 g for 618/1000 MA; seal and cage executions of the same envelope differ by a few grams." }, { "q": "What internal clearance does 618-1000-MA have?", "a": "Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life." } ], "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": [ "618-1000-MA", "618/1000 MA" ], "locale_variants": {} }, { "sku": "618-1060-MA", "brand": "SKF", "manufacturer_designation": "618/1060 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 1060, "D_mm": 1280, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 728, "static_load_kN": 2120, "fatigue_load_limit_kN": 26.5, "reference_speed_rpm": 670, "limiting_speed_rpm": 560, "max_rpm": 560, "weight_g": 260000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 1060 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 1060×1280×100 mm (41.732×50.394×3.937 in) with a 110.0 mm radial section height, C 728 kN, C0 2120 kN and Pu 26.5 kN. The open 618/1060 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 560 r/min, catalogue mass 260000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "fretting corrosion on a creeping shaft or housing seat", "cage damage from running beyond the limiting speed" ], "pitfalls": [ "Fillet radii must clear the 618-1060-MA chamfer so the 100 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 26.5 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "The MA suffix on 618-1060-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 260000 g quoted mass includes the heavier cage.", "Open 618-1060-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-1060-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Mount by heating the inner ring (max 120 °C) — driving 618-1060-MA home through the outer ring or balls brinells the raceways.", "A replacement 618/1060 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation." ], "faq": [ { "q": "What are the dimensions of 618-1060-MA?", "a": "The SKF 618/1060 MA measures 1060 mm bore × 1280 mm OD × 100 mm width (41.732 × 50.394 × 3.937 in), mass about 260000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/1060 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/1060 means 1060 mm bore. The site slug 618-1060-MA replaces the slash with a hyphen." }, { "q": "What is the speed rating of 618-1060-MA?", "a": "SKF lists a 670 r/min thermal reference speed and a 560 r/min mechanical limiting speed for 618/1060 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-1060-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-1060-MA has a 110 mm radial section and C 728 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-1060-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 1280 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "618-1060-MA", "618/1060 MA" ], "locale_variants": {} }, { "sku": "618-1120-MA", "brand": "SKF", "manufacturer_designation": "618/1120 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 1120, "D_mm": 1360, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 741, "static_load_kN": 2200, "fatigue_load_limit_kN": 26.5, "reference_speed_rpm": 630, "limiting_speed_rpm": 530, "max_rpm": 530, "weight_g": 315000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 1120 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 1120×1360×106 mm (44.094×53.543×4.173 in) with a 120.0 mm radial section height, C 741 kN, C0 2200 kN and Pu 26.5 kN. The open 618/1120 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 530 r/min, catalogue mass 315000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "false brinelling from vibration while the shaft stands idle", "fretting corrosion on a creeping shaft or housing seat" ], "pitfalls": [ "Do not preload 618-1120-MA 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 1120 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 MA suffix on 618-1120-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 315000 g quoted mass includes the heavier cage.", "Open 618-1120-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-1120-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Fillet radii must clear the 618-1120-MA chamfer so the 106 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "For positions that need relubrication, choose the open execution of 618/1120 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.", "A replacement 618/1120 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 618-1120-MA?", "a": "The SKF 618/1120 MA measures 1120 mm bore × 1360 mm OD × 106 mm width (44.094 × 53.543 × 4.173 in), mass about 315000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/1120 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/1120 means 1120 mm bore. The site slug 618-1120-MA replaces the slash with a hyphen." }, { "q": "What is the speed rating of 618-1120-MA?", "a": "SKF lists a 630 r/min thermal reference speed and a 530 r/min mechanical limiting speed for 618/1120 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-1120-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-1120-MA has a 120 mm radial section and C 741 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-1120-MA?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 1360 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "618-1120-MA", "618/1120 MA" ], "locale_variants": {} }, { "sku": "618-1180-MB", "brand": "SKF", "manufacturer_designation": "618/1180 MB", "series": "61800-series", "type": "deep_groove", "d_mm": 1180, "D_mm": 1420, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 761, "static_load_kN": 2360, "fatigue_load_limit_kN": 27.5, "reference_speed_rpm": 560, "limiting_speed_rpm": 480, "max_rpm": 480, "weight_g": 337000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 1180 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 1180×1420×106 mm (46.457×55.906×4.173 in) with a 120.0 mm radial section height, C 761 kN, C0 2360 kN and Pu 27.5 kN. The open 618/1180 MB carries no shields or seals and relies on application lubrication and external sealing. The MB suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 480 r/min, catalogue mass 337000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile and packaging machinery", "slew and indexing drives" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "brinelling from static overload or hammer blows during mounting", "false brinelling from vibration while the shaft stands idle" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 618-1180-MB home through the outer ring or balls brinells the raceways.", "Clearance suffixes follow the seal code in the designation stack (e.g. 618/1180-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The MB suffix on 618-1180-MB denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 337000 g quoted mass includes the heavier cage.", "Open 618-1180-MB needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-1180-MB; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Catalogue ratings for 618-1180-MB (C 761 kN, C0 2360 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.", "SKF Explorer deep-groove bearings of this size are produced to tight internal-geometry control; rating revisions between catalogue years do not change the designation, so keep the catalogue edition with the machine documentation.", "A replacement 618/1180 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats." ], "faq": [ { "q": "What are the dimensions of 618-1180-MB?", "a": "The SKF 618/1180 MB measures 1180 mm bore × 1420 mm OD × 106 mm width (46.457 × 55.906 × 4.173 in), mass about 337000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/1180 MB?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/1180 means 1180 mm bore. The site slug 618-1180-MB replaces the slash with a hyphen." }, { "q": "How long can a greased 618-1180-MB be stored?", "a": "Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly." }, { "q": "What load can 618-1180-MB take?", "a": "Catalogue values for 618/1180 MB: dynamic C 761 kN, static C0 2360 kN, fatigue limit Pu 27.5 kN. Use C in life calculation and C0 for static checks at 1180 mm bore." }, { "q": "What is the speed rating of 618-1180-MB?", "a": "SKF lists a 560 r/min thermal reference speed and a 480 r/min mechanical limiting speed for 618/1180 MB; real limits also depend on lubrication and fits." } ], "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": [ "618-1180-MB", "618/1180 MB" ], "locale_variants": {} }, { "sku": "618-1320-MA", "brand": "SKF", "manufacturer_designation": "618/1320 MA", "series": "61800-series", "type": "deep_groove", "d_mm": 1320, "D_mm": 1600, "B_mm": 122, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 956, "static_load_kN": 3150, "fatigue_load_limit_kN": 35.5, "reference_speed_rpm": 480, "limiting_speed_rpm": 400, "max_rpm": 400, "weight_g": 500000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 1320 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 1320×1600×122 mm (51.969×62.992×4.803 in) with a 140.0 mm radial section height, C 956 kN, C0 3150 kN and Pu 35.5 kN. The open 618/1320 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 400 r/min, catalogue mass 500000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "crusher auxiliary drives", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "rolling-contact fatigue spalling once the catalogue L10 life is exceeded", "brinelling from static overload or hammer blows during mounting" ], "pitfalls": [ "Assign interference to the rotating ring: on a conventional shaft-mounted 1320 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 618-1320-MA chamfer so the 122 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The MA suffix on 618-1320-MA denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 500000 g quoted mass includes the heavier cage.", "Open 618-1320-MA needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-1320-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 1320 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 618-1320-MA?", "a": "The SKF 618/1320 MA measures 1320 mm bore × 1600 mm OD × 122 mm width (51.969 × 62.992 × 4.803 in), mass about 500000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/1320 MA?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/1320 means 1320 mm bore. The site slug 618-1320-MA replaces the slash with a hyphen." }, { "q": "What load can 618-1320-MA take?", "a": "Catalogue values for 618/1320 MA: dynamic C 956 kN, static C0 3150 kN, fatigue limit Pu 35.5 kN. Use C in life calculation and C0 for static checks at 1320 mm bore." }, { "q": "What is the speed rating of 618-1320-MA?", "a": "SKF lists a 480 r/min thermal reference speed and a 400 r/min mechanical limiting speed for 618/1320 MA; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-1320-MA and a same-bore 62-series bearing?", "a": "Section height differs: 618-1320-MA has a 140 mm radial section and C 956 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." } ], "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": [ "618-1320-MA", "618/1320 MA" ], "locale_variants": {} }, { "sku": "618-1500-TN", "brand": "SKF", "manufacturer_designation": "618/1500 TN", "series": "61800-series", "type": "deep_groove", "d_mm": 1500, "D_mm": 1820, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 1170, "static_load_kN": 4150, "fatigue_load_limit_kN": 43, "reference_speed_rpm": 380, "limiting_speed_rpm": 240, "max_rpm": 240, "weight_g": 638000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the large-bore 61800-series, the bore is written directly after the slash as 1500 mm (large thin-section bores use the slash spelling instead of the two-digit code). The envelope is 1500×1820×140 mm (59.055×71.654×5.512 in) with a 160.0 mm radial section height, C 1170 kN, C0 4150 kN and Pu 43 kN. The open 618/1500 TN carries no shields or seals and relies on application lubrication and external sealing. The TN suffix identifies the glass-fibre polyamide cage execution, a separate order number from the steel-cage version. Limiting speed 240 r/min, catalogue mass 638000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.", "applications": [ "heavy conveyor drives", "hoists and winches", "industrial fans and blowers", "mill and kiln auxiliaries" ], "failure_modes": [ "contamination wear when the open arrangement is used without external seals", "lubricant starvation where no regreasing interval is maintained", "cage damage from running beyond the limiting speed", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount by heating the inner ring (max 120 °C) — driving 618-1500-TN home through the outer ring or balls brinells the raceways.", "Deep-groove geometry tolerates only minutes of misalignment; if the 1820 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 618-1500-TN.", "Suffix TN is a glass-fibre-reinforced polyamide cage: quiet and light at the 240 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.", "Open 618-1500-TN needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.", "Plan a relubrication interval for 618-1500-TN; run-to-failure on open deep-groove bearings is the dominant early-failure cause.", "Assign interference to the rotating ring: on a conventional shaft-mounted 1500 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.", "Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.", "SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration." ], "faq": [ { "q": "What are the dimensions of 618-1500-TN?", "a": "The SKF 618/1500 TN measures 1500 mm bore × 1820 mm OD × 140 mm width (59.055 × 71.654 × 5.512 in), mass about 638000 g. It is open, with no shields or seals." }, { "q": "Why is there a slash in the designation 618/1500 TN?", "a": "The slash writes a bore that falls outside the two-digit code table: 618/1500 means 1500 mm bore. The site slug 618-1500-TN replaces the slash with a hyphen." }, { "q": "What is the speed rating of 618-1500-TN?", "a": "SKF lists a 380 r/min thermal reference speed and a 240 r/min mechanical limiting speed for 618/1500 TN; real limits also depend on lubrication and fits." }, { "q": "What is the difference between 618-1500-TN and a same-bore 62-series bearing?", "a": "Section height differs: 618-1500-TN has a 160 mm radial section and C 1170 kN; always match d, D and B — same bore alone never makes two bearings interchangeable." }, { "q": "Which fits should I use for 618-1500-TN?", "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 1820 mm housing; reverse the interference if the outer ring rotates." } ], "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": [ "618-1500-TN", "618/1500 TN" ], "locale_variants": {} }, { "sku": "W618-1", "brand": "SKF", "manufacturer_designation": "W 618/1", "series": "61800-series", "type": "deep_groove", "d_mm": 1, "D_mm": 3, "B_mm": 1, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.052, "static_load_kN": 0.012, "fatigue_load_limit_kN": 0.001, "reference_speed_rpm": 240000, "limiting_speed_rpm": 150000, "max_rpm": 150000, "weight_g": 0.03, "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 bore is written directly after the slash as 1 mm (bores below 10 mm use the slash spelling). Envelope 1×3×1 mm (0.039×0.118×0.039 in), C 0.052 kN, C0 0.012 kN, Pu 0.001 kN; limiting speed 150000 r/min and mass 0.03 g. The open W 618/1 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 W618-1; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W618-1 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 W618-1 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 — W618-1 is not marine-grade stainless.", "At 1 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.", "The fatigue load limit is 0.001 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 W618-1?", "a": "SKF W 618/1 measures 1×3×1 mm (0.039×0.118×0.039 in), about 0.03 g, C 0.052 kN." }, { "q": "What does the W in W 618/1 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 W618-1; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W618-1?", "a": "The envelope matches, but stainless rates lower (C 0.052 kN for W 618/1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "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": [ "W618-1", "W 618/1" ], "locale_variants": {} }, { "sku": "W618-1-5", "brand": "SKF", "manufacturer_designation": "W 618/1.5", "series": "61800-series", "type": "deep_groove", "d_mm": 1.5, "D_mm": 4, "B_mm": 1.2, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.062, "static_load_kN": 0.016, "fatigue_load_limit_kN": 0.001, "reference_speed_rpm": 220000, "limiting_speed_rpm": 140000, "max_rpm": 140000, "weight_g": 0.1, "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, the bore is written directly after the slash as 1.5 mm (bores below 10 mm use the slash spelling). Envelope 1.5×4×1.2 mm (0.059×0.157×0.047 in), C 0.062 kN, C0 0.016 kN, Pu 0.001 kN; limiting speed 140000 r/min and mass 0.1 g. The open W 618/1.5 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 W618-1-5; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W618-1-5 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 W618-1-5 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 — W618-1-5 is not marine-grade stainless.", "Do not preload W618-1-5 to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "At 1.5 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 W618-1-5?", "a": "SKF W 618/1.5 measures 1.5×4×1.2 mm (0.059×0.157×0.047 in), about 0.1 g, C 0.062 kN." }, { "q": "What does the W in W 618/1.5 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 W618-1-5 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 W618-1-5?", "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": [], "source_ref": "https://cdn.skfmediahub.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": [ "W618-1-5", "W 618/1.5" ], "locale_variants": {} }, { "sku": "W638-1-5-ZZ", "brand": "SKF", "manufacturer_designation": "W 638/1.5-2Z", "series": "63800-series", "type": "deep_groove", "d_mm": 1.5, "D_mm": 4, "B_mm": 2, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.062, "static_load_kN": 0.016, "fatigue_load_limit_kN": 0.001, "reference_speed_rpm": 220000, "limiting_speed_rpm": 110000, "max_rpm": 110000, "weight_g": 0.1, "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 63800-series, the bore is written directly after the slash as 1.5 mm (bores below 10 mm use the slash spelling). Envelope 1.5×4×2 mm (0.059×0.157×0.079 in), C 0.062 kN, C0 0.016 kN, Pu 0.001 kN; limiting speed 110000 r/min and mass 0.1 g. SKF spells the double shield W 638/1.5-2Z (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 W638-1-5-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 W638-1-5-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 — W638-1-5-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W638-1-5-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "The fatigue load limit is 0.001 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 0.001 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 W638-1-5-ZZ?", "a": "SKF W 638/1.5-2Z measures 1.5×4×2 mm (0.059×0.157×0.079 in), about 0.1 g, C 0.062 kN." }, { "q": "What does the W in W 638/1.5-2Z 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 W638-1-5-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 W638-1-5-ZZ; add seals and food-grade grease for wet positions." } ], "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": [ "W638-1-5-ZZ", "W 638/1.5-2Z" ], "locale_variants": {} }, { "sku": "W618-2", "brand": "SKF", "manufacturer_designation": "W 618/2", "series": "61800-series", "type": "deep_groove", "d_mm": 2, "D_mm": 5, "B_mm": 1.5, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.094, "static_load_kN": 0.025, "fatigue_load_limit_kN": 0.001, "reference_speed_rpm": 200000, "limiting_speed_rpm": 120000, "max_rpm": 120000, "weight_g": 0.1, "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, the bore is written directly after the slash as 2 mm (bores below 10 mm use the slash spelling). Envelope 2×5×1.5 mm (0.079×0.197×0.059 in), C 0.094 kN, C0 0.025 kN, Pu 0.001 kN; limiting speed 120000 r/min and mass 0.1 g. The open W 618/2 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 — W618-2 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W618-2 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: W618-2 is quoted at C 0.094 kN versus the 1.5 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 W618-2; standard fill is industrial grease unless specified otherwise.", "Deep-groove geometry tolerates only minutes of misalignment; if the 5 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W618-2.", "Fillet radii must clear the W618-2 chamfer so the 1.5 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 W618-2?", "a": "SKF W 618/2 measures 2×5×1.5 mm (0.079×0.197×0.059 in), about 0.1 g, C 0.094 kN." }, { "q": "What does the W in W 618/2 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 W618-2?", "a": "The envelope matches, but stainless rates lower (C 0.094 kN for W 618/2); 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": [], "source_ref": "https://cdn.skfmediahub.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": [ "W618-2", "W 618/2" ], "locale_variants": {} }, { "sku": "W638-2-ZZ", "brand": "SKF", "manufacturer_designation": "W 638/2-2Z", "series": "63800-series", "type": "deep_groove", "d_mm": 2, "D_mm": 5, "B_mm": 2.3, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.094, "static_load_kN": 0.025, "fatigue_load_limit_kN": 0.001, "reference_speed_rpm": 200000, "limiting_speed_rpm": 100000, "max_rpm": 100000, "weight_g": 0.2, "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 63800-series, the bore is written directly after the slash as 2 mm (bores below 10 mm use the slash spelling). Envelope 2×5×2.3 mm (0.079×0.197×0.091 in), C 0.094 kN, C0 0.025 kN, Pu 0.001 kN; limiting speed 100000 r/min and mass 0.2 g. SKF spells the double shield W 638/2-2Z (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 W638-2-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W638-2-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 W638-2-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 — W638-2-ZZ is not marine-grade stainless.", "Fillet radii must clear the W638-2-ZZ chamfer so the 2.3 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 2 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 W638-2-ZZ?", "a": "SKF W 638/2-2Z measures 2×5×2.3 mm (0.079×0.197×0.091 in), about 0.2 g, C 0.094 kN." }, { "q": "What does the W in W 638/2-2Z 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 W638-2-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "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": [ "W638-2-ZZ", "W 638/2-2Z" ], "locale_variants": {} }, { "sku": "W639-2-ZZ", "brand": "SKF", "manufacturer_designation": "W 639/2-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 2, "D_mm": 6, "B_mm": 3, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.19, "static_load_kN": 0.051, "fatigue_load_limit_kN": 0.002, "reference_speed_rpm": 180000, "limiting_speed_rpm": 90000, "max_rpm": 90000, "weight_g": 0.31, "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 bore is written directly after the slash as 2 mm (bores below 10 mm use the slash spelling). Envelope 2×6×3 mm (0.079×0.236×0.118 in), C 0.19 kN, C0 0.051 kN, Pu 0.002 kN; limiting speed 90000 r/min and mass 0.31 g. SKF spells the double shield W 639/2-2Z (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: W639-2-ZZ is quoted at C 0.19 kN versus the 3 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 W639-2-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W639-2-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 W639-2-ZZ inside the quoted grease temperature range.", "Fillet radii must clear the W639-2-ZZ chamfer so the 3 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Fillet radii must clear the W639-2-ZZ chamfer so the 3 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 W639-2-ZZ?", "a": "SKF W 639/2-2Z measures 2×6×3 mm (0.079×0.236×0.118 in), about 0.31 g, C 0.19 kN." }, { "q": "What does the W in W 639/2-2Z 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 W639-2-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": "W638-2-5-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 2×6×3 mm envelope as SKF W 638/2.5-2Z, but catalogue C/C0 differ (0.19/0.051 kN vs 0.117/0.036 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": [ "W639-2-ZZ", "W 639/2-2Z" ], "locale_variants": {} }, { "sku": "W638-2-5-ZZ", "brand": "SKF", "manufacturer_designation": "W 638/2.5-2Z", "series": "63800-series", "type": "deep_groove", "d_mm": 2.5, "D_mm": 6, "B_mm": 2.6, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.117, "static_load_kN": 0.036, "fatigue_load_limit_kN": 0.002, "reference_speed_rpm": 170000, "limiting_speed_rpm": 85000, "max_rpm": 85000, "weight_g": 0.31, "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 63800-series, the bore is written directly after the slash as 2.5 mm (bores below 10 mm use the slash spelling). Envelope 2.5×6×2.6 mm (0.098×0.236×0.102 in), C 0.117 kN, C0 0.036 kN, Pu 0.002 kN; limiting speed 85000 r/min and mass 0.31 g. SKF spells the double shield W 638/2.5-2Z (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 W638-2-5-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 — W638-2-5-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W638-2-5-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: W638-2-5-ZZ is quoted at C 0.117 kN versus the 2.6 mm-wide 52100 version — do not swap on dimensions alone.", "Do not preload W638-2-5-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 2.5 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 W638-2-5-ZZ?", "a": "SKF W 638/2.5-2Z measures 2.5×6×2.6 mm (0.098×0.236×0.102 in), about 0.31 g, C 0.117 kN." }, { "q": "What does the W in W 638/2.5-2Z 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 W638-2-5-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 W638-2-5-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": "W639-2-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 2.5×6×2.6 mm envelope as SKF W 639/2-2Z, but catalogue C/C0 differ (0.117/0.036 kN vs 0.19/0.051 kN) — envelope match only after a load check." }, { "equiv_sku": "W637-3-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (2.5×6×2.6 mm) SKF deep-groove bearing W 637/3-2Z with ratings within 10 % — interchangeable after checking the execution details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W638-2-5-ZZ", "W 638/2.5-2Z" ], "locale_variants": {} }, { "sku": "W637-3-ZZ", "brand": "SKF", "manufacturer_designation": "W 637/3-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 3, "D_mm": 6, "B_mm": 3, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.117, "static_load_kN": 0.036, "fatigue_load_limit_kN": 0.002, "reference_speed_rpm": 170000, "limiting_speed_rpm": 85000, "max_rpm": 85000, "weight_g": 0.31, "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 bore is written directly after the slash as 3 mm (bores below 10 mm use the slash spelling). Envelope 3×6×3 mm (0.118×0.236×0.118 in), C 0.117 kN, C0 0.036 kN, Pu 0.002 kN; limiting speed 85000 r/min and mass 0.31 g. SKF spells the double shield W 637/3-2Z (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": [ "The stainless steel is martensitic and MAGNETIC; do not reject W637-3-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: W637-3-ZZ is quoted at C 0.117 kN versus the 3 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 W637-3-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W637-3-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Deep-groove geometry tolerates only minutes of misalignment; if the 6 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W637-3-ZZ.", "The fatigue load limit is 0.002 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 W637-3-ZZ?", "a": "SKF W 637/3-2Z measures 3×6×3 mm (0.118×0.236×0.118 in), about 0.31 g, C 0.117 kN." }, { "q": "What does the W in W 637/3-2Z 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 W637-3-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": "W638-2-5-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Envelope-identical (3×6×3 mm) SKF deep-groove bearing W 638/2.5-2Z with ratings within 10 % — interchangeable after checking the execution details on both pages." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W637-3-ZZ", "W 637/3-2Z" ], "locale_variants": {} }, { "sku": "W618-3", "brand": "SKF", "manufacturer_designation": "W 618/3", "series": "61800-series", "type": "deep_groove", "d_mm": 3, "D_mm": 7, "B_mm": 2, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.178, "static_load_kN": 0.057, "fatigue_load_limit_kN": 0.002, "reference_speed_rpm": 160000, "limiting_speed_rpm": 100000, "max_rpm": 100000, "weight_g": 0.3, "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 bore is written directly after the slash as 3 mm (bores below 10 mm use the slash spelling). Envelope 3×7×2 mm (0.118×0.276×0.079 in), C 0.178 kN, C0 0.057 kN, Pu 0.002 kN; limiting speed 100000 r/min and mass 0.3 g. The open W 618/3 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 W618-3 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 — W618-3 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W618-3 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: W618-3 is quoted at C 0.178 kN versus the 2 mm-wide 52100 version — do not swap on dimensions alone.", "Do not preload W618-3 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 3 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 W618-3?", "a": "SKF W 618/3 measures 3×7×2 mm (0.118×0.276×0.079 in), about 0.3 g, C 0.178 kN." }, { "q": "What does the W in W 618/3 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 W618-3 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "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": [ "W618-3", "W 618/3" ], "locale_variants": {} }, { "sku": "W638-3-ZZ", "brand": "SKF", "manufacturer_designation": "W 638/3-2Z", "series": "63800-series", "type": "deep_groove", "d_mm": 3, "D_mm": 7, "B_mm": 3, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.178, "static_load_kN": 0.057, "fatigue_load_limit_kN": 0.002, "reference_speed_rpm": 160000, "limiting_speed_rpm": 80000, "max_rpm": 80000, "weight_g": 0.41, "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 63800-series, the bore is written directly after the slash as 3 mm (bores below 10 mm use the slash spelling). Envelope 3×7×3 mm (0.118×0.276×0.118 in), C 0.178 kN, C0 0.057 kN, Pu 0.002 kN; limiting speed 80000 r/min and mass 0.41 g. SKF spells the double shield W 638/3-2Z (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": [ "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 — W638-3-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W638-3-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: W638-3-ZZ is quoted at C 0.178 kN versus the 3 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 W638-3-ZZ; standard fill is industrial grease unless specified otherwise.", "Do not preload W638-3-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 7 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W638-3-ZZ." ], "faq": [ { "q": "What are the dimensions of the stainless W638-3-ZZ?", "a": "SKF W 638/3-2Z measures 3×7×3 mm (0.118×0.276×0.118 in), about 0.41 g, C 0.178 kN." }, { "q": "What does the W in W 638/3-2Z 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 W638-3-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "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": [ "W638-3-ZZ", "W 638/3-2Z" ], "locale_variants": {} }, { "sku": "W619-3-ZZ", "brand": "SKF", "manufacturer_designation": "W 619/3-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 3, "D_mm": 8, "B_mm": 3, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.225, "static_load_kN": 0.072, "fatigue_load_limit_kN": 0.003, "reference_speed_rpm": 150000, "limiting_speed_rpm": 75000, "max_rpm": 75000, "weight_g": 0.61, "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 bore is written directly after the slash as 3 mm (bores below 10 mm use the slash spelling). Envelope 3×8×3 mm (0.118×0.315×0.118 in), C 0.225 kN, C0 0.072 kN, Pu 0.003 kN; limiting speed 75000 r/min and mass 0.61 g. SKF spells the double shield W 619/3-2Z (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 W619-3-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W619-3-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 W619-3-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 — W619-3-ZZ is not marine-grade stainless.", "Do not preload W619-3-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 8 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W619-3-ZZ." ], "faq": [ { "q": "What are the dimensions of the stainless W619-3-ZZ?", "a": "SKF W 619/3-2Z measures 3×8×3 mm (0.118×0.315×0.118 in), about 0.61 g, C 0.225 kN." }, { "q": "What does the W in W 619/3-2Z 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 W619-3-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W619-3-ZZ?", "a": "The envelope matches, but stainless rates lower (C 0.225 kN for W 619/3-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "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": [ "W619-3-ZZ", "W 619/3-2Z" ], "locale_variants": {} }, { "sku": "W639-3-ZZ", "brand": "SKF", "manufacturer_designation": "W 639/3-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 3, "D_mm": 8, "B_mm": 4, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.319, "static_load_kN": 0.09, "fatigue_load_limit_kN": 0.004, "reference_speed_rpm": 150000, "limiting_speed_rpm": 75000, "max_rpm": 75000, "weight_g": 0.82, "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, the bore is written directly after the slash as 3 mm (bores below 10 mm use the slash spelling). Envelope 3×8×4 mm (0.118×0.315×0.157 in), C 0.319 kN, C0 0.09 kN, Pu 0.004 kN; limiting speed 75000 r/min and mass 0.82 g. SKF spells the double shield W 639/3-2Z (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 W639-3-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W639-3-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 W639-3-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 — W639-3-ZZ is not marine-grade stainless.", "Mount by heating the inner ring (max 120 °C) — driving W639-3-ZZ home through the outer ring or balls brinells the raceways.", "Do not preload W639-3-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 W639-3-ZZ?", "a": "SKF W 639/3-2Z measures 3×8×4 mm (0.118×0.315×0.157 in), about 0.82 g, C 0.319 kN." }, { "q": "What does the W in W 639/3-2Z 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 W639-3-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 W639-3-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": [], "source_ref": "https://cdn.skfmediahub.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": [ "W639-3-ZZ", "W 639/3-2Z" ], "locale_variants": {} }, { "sku": "W623-2RS", "brand": "SKF", "manufacturer_designation": "W 623-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 3, "D_mm": 10, "B_mm": 4, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.358, "static_load_kN": 0.11, "fatigue_load_limit_kN": 0.005, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 1.5, "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 final digit is the bore in millimetres: 623 fits a 3 mm shaft (direct-number miniature spelling). Envelope 3×10×4 mm (0.118×0.394×0.157 in), C 0.358 kN, C0 0.11 kN, Pu 0.005 kN; limiting speed 40000 r/min and mass 1.5 g. SKF catalogues the sealed execution as W 623-2RS1: 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 W623-2RS 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 — W623-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W623-2RS 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: W623-2RS is quoted at C 0.358 kN versus the 4 mm-wide 52100 version — do not swap on dimensions alone.", "Mount by heating the inner ring (max 120 °C) — driving W623-2RS home through the outer ring or balls brinells the raceways.", "Mount by heating the inner ring (max 120 °C) — driving W623-2RS home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W623-2RS?", "a": "SKF W 623-2RS1 measures 3×10×4 mm (0.118×0.394×0.157 in), about 1.5 g, C 0.358 kN." }, { "q": "What does the W in W 623-2RS1 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 W623-2RS?", "a": "The envelope matches, but stainless rates lower (C 0.358 kN for W 623-2RS1); 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": "W623-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 3×10×4 mm envelope and equivalent catalogue ratings; W 623-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W623-2RS", "W 623-2RS1" ], "locale_variants": {} }, { "sku": "W623-ZZ", "brand": "SKF", "manufacturer_designation": "W 623-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 3, "D_mm": 10, "B_mm": 4, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.358, "static_load_kN": 0.11, "fatigue_load_limit_kN": 0.005, "reference_speed_rpm": 140000, "limiting_speed_rpm": 70000, "max_rpm": 70000, "weight_g": 1.6, "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 6200-series, the final digit is the bore in millimetres: 623 fits a 3 mm shaft (direct-number miniature spelling). Envelope 3×10×4 mm (0.118×0.394×0.157 in), C 0.358 kN, C0 0.11 kN, Pu 0.005 kN; limiting speed 70000 r/min and mass 1.6 g. SKF spells the double shield W 623-2Z (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 W623-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 W623-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 — W623-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W623-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Do not preload W623-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "At 3 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 W623-ZZ?", "a": "SKF W 623-2Z measures 3×10×4 mm (0.118×0.394×0.157 in), about 1.6 g, C 0.358 kN." }, { "q": "What does the W in W 623-2Z 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 W623-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W623-ZZ?", "a": "The envelope matches, but stainless rates lower (C 0.358 kN for W 623-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W623-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 3×10×4 mm envelope and equivalent catalogue ratings; W 623-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W623-ZZ", "W 623-2Z" ], "locale_variants": {} }, { "sku": "W627-4-ZZ", "brand": "SKF", "manufacturer_designation": "W 627/4-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 4, "D_mm": 7, "B_mm": 2.5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.143, "static_load_kN": 0.053, "fatigue_load_limit_kN": 0.002, "reference_speed_rpm": 150000, "limiting_speed_rpm": 75000, "max_rpm": 75000, "weight_g": 0.31, "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 bore is written directly after the slash as 4 mm (bores below 10 mm use the slash spelling). Envelope 4×7×2.5 mm (0.157×0.276×0.098 in), C 0.143 kN, C0 0.053 kN, Pu 0.002 kN; limiting speed 75000 r/min and mass 0.31 g. SKF spells the double shield W 627/4-2Z (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": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W627-4-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W627-4-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 W627-4-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 — W627-4-ZZ is not marine-grade stainless.", "The fatigue load limit is 0.002 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Catalogue ratings for W627-4-ZZ (C 0.143 kN, C0 0.053 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 W627-4-ZZ?", "a": "SKF W 627/4-2Z measures 4×7×2.5 mm (0.157×0.276×0.098 in), about 0.31 g, C 0.143 kN." }, { "q": "What does the W in W 627/4-2Z 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 W627-4-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "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": [ "W627-4-ZZ", "W 627/4-2Z" ], "locale_variants": {} }, { "sku": "W618-4", "brand": "SKF", "manufacturer_designation": "W 618/4", "series": "61800-series", "type": "deep_groove", "d_mm": 4, "D_mm": 9, "B_mm": 2.5, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.364, "static_load_kN": 0.114, "fatigue_load_limit_kN": 0.005, "reference_speed_rpm": 140000, "limiting_speed_rpm": 85000, "max_rpm": 85000, "weight_g": 0.6, "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, the bore is written directly after the slash as 4 mm (bores below 10 mm use the slash spelling). Envelope 4×9×2.5 mm (0.157×0.354×0.098 in), C 0.364 kN, C0 0.114 kN, Pu 0.005 kN; limiting speed 85000 r/min and mass 0.6 g. The open W 618/4 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 — W618-4 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W618-4 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: W618-4 is quoted at C 0.364 kN versus the 2.5 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 W618-4; standard fill is industrial grease unless specified otherwise.", "Fillet radii must clear the W618-4 chamfer so the 2.5 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload W618-4 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 W618-4?", "a": "SKF W 618/4 measures 4×9×2.5 mm (0.157×0.354×0.098 in), about 0.6 g, C 0.364 kN." }, { "q": "What does the W in W 618/4 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 W618-4; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W618-4?", "a": "The envelope matches, but stainless rates lower (C 0.364 kN for W 618/4); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "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": [ "W618-4", "W 618/4" ], "locale_variants": {} }, { "sku": "W638-4-ZZ", "brand": "SKF", "manufacturer_designation": "W 638/4-2Z", "series": "63800-series", "type": "deep_groove", "d_mm": 4, "D_mm": 9, "B_mm": 4, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.364, "static_load_kN": 0.114, "fatigue_load_limit_kN": 0.005, "reference_speed_rpm": 140000, "limiting_speed_rpm": 70000, "max_rpm": 70000, "weight_g": 0.93, "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 63800-series, the bore is written directly after the slash as 4 mm (bores below 10 mm use the slash spelling). Envelope 4×9×4 mm (0.157×0.354×0.157 in), C 0.364 kN, C0 0.114 kN, Pu 0.005 kN; limiting speed 70000 r/min and mass 0.93 g. SKF spells the double shield W 638/4-2Z (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": [ "The stainless steel is martensitic and MAGNETIC; do not reject W638-4-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: W638-4-ZZ is quoted at C 0.364 kN versus the 4 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 W638-4-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W638-4-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Fillet radii must clear the W638-4-ZZ chamfer so the 4 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Do not preload W638-4-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 W638-4-ZZ?", "a": "SKF W 638/4-2Z measures 4×9×4 mm (0.157×0.354×0.157 in), about 0.93 g, C 0.364 kN." }, { "q": "What does the W in W 638/4-2Z 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 W638-4-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 W638-4-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": [], "source_ref": "https://cdn.skfmediahub.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": [ "W638-4-ZZ", "W 638/4-2Z" ], "locale_variants": {} }, { "sku": "W619-4-ZZ", "brand": "SKF", "manufacturer_designation": "W 619/4-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 4, "D_mm": 11, "B_mm": 4, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.54, "static_load_kN": 0.176, "fatigue_load_limit_kN": 0.008, "reference_speed_rpm": 130000, "limiting_speed_rpm": 63000, "max_rpm": 63000, "weight_g": 1.65, "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 bore is written directly after the slash as 4 mm (bores below 10 mm use the slash spelling). Envelope 4×11×4 mm (0.157×0.433×0.157 in), C 0.54 kN, C0 0.176 kN, Pu 0.008 kN; limiting speed 63000 r/min and mass 1.65 g. SKF spells the double shield W 619/4-2Z (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: W619-4-ZZ is quoted at C 0.54 kN versus the 4 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 W619-4-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W619-4-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 W619-4-ZZ inside the quoted grease temperature range.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 619/4-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 619/4-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W619-4-ZZ?", "a": "SKF W 619/4-2Z measures 4×11×4 mm (0.157×0.433×0.157 in), about 1.65 g, C 0.54 kN." }, { "q": "What does the W in W 619/4-2Z 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 W619-4-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 W619-4-ZZ; add seals and food-grade grease for wet positions." } ], "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": [ "W619-4-ZZ", "W 619/4-2Z" ], "locale_variants": {} }, { "sku": "W604-2RS", "brand": "SKF", "manufacturer_designation": "W 604-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 4, "D_mm": 12, "B_mm": 4, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.54, "static_load_kN": 0.176, "fatigue_load_limit_kN": 0.008, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 2.15, "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 final digit is the bore in millimetres: 604 fits a 4 mm shaft (direct-number miniature spelling). Envelope 4×12×4 mm (0.157×0.472×0.157 in), C 0.54 kN, C0 0.176 kN, Pu 0.008 kN; limiting speed 36000 r/min and mass 2.15 g. SKF catalogues the sealed execution as W 604-2RS1: 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: W604-2RS is quoted at C 0.54 kN versus the 4 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 W604-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W604-2RS 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 W604-2RS inside the quoted grease temperature range.", "Mount by heating the inner ring (max 120 °C) — driving W604-2RS home through the outer ring or balls brinells the raceways.", "Do not preload W604-2RS 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 W604-2RS?", "a": "SKF W 604-2RS1 measures 4×12×4 mm (0.157×0.472×0.157 in), about 2.15 g, C 0.54 kN." }, { "q": "What does the W in W 604-2RS1 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 W604-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W604-2RS?", "a": "The envelope matches, but stainless rates lower (C 0.54 kN for W 604-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W604-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 4×12×4 mm envelope and equivalent catalogue ratings; W 604-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W604", "equiv_brand": "SKF", "level": "full", "note": "Same 4×12×4 mm envelope and equivalent catalogue ratings; W 604 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W604-2RS", "W 604-2RS1" ], "locale_variants": {} }, { "sku": "W604-ZZ", "brand": "SKF", "manufacturer_designation": "W 604-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 4, "D_mm": 12, "B_mm": 4, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.54, "static_load_kN": 0.176, "fatigue_load_limit_kN": 0.008, "reference_speed_rpm": 130000, "limiting_speed_rpm": 63000, "max_rpm": 63000, "weight_g": 2.15, "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 final digit is the bore in millimetres: 604 fits a 4 mm shaft (direct-number miniature spelling). Envelope 4×12×4 mm (0.157×0.472×0.157 in), C 0.54 kN, C0 0.176 kN, Pu 0.008 kN; limiting speed 63000 r/min and mass 2.15 g. SKF spells the double shield W 604-2Z (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": [ "The stainless steel is martensitic and MAGNETIC; do not reject W604-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: W604-ZZ is quoted at C 0.54 kN versus the 4 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 W604-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W604-ZZ 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 604-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Fillet radii must clear the W604-ZZ chamfer so the 4 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 W604-ZZ?", "a": "SKF W 604-2Z measures 4×12×4 mm (0.157×0.472×0.157 in), about 2.15 g, C 0.54 kN." }, { "q": "What does the W in W 604-2Z 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 W604-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": "W604-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 4×12×4 mm envelope and equivalent catalogue ratings; W 604-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W604", "equiv_brand": "SKF", "level": "full", "note": "Same 4×12×4 mm envelope and equivalent catalogue ratings; W 604 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W604-ZZ", "W 604-2Z" ], "locale_variants": {} }, { "sku": "W604", "brand": "SKF", "manufacturer_designation": "W 604", "series": "6000-series", "type": "deep_groove", "d_mm": 4, "D_mm": 12, "B_mm": 4, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.54, "static_load_kN": 0.176, "fatigue_load_limit_kN": 0.008, "reference_speed_rpm": 130000, "limiting_speed_rpm": 80000, "max_rpm": 80000, "weight_g": 2, "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 final digit is the bore in millimetres: 604 fits a 4 mm shaft (direct-number miniature spelling). Envelope 4×12×4 mm (0.157×0.472×0.157 in), C 0.54 kN, C0 0.176 kN, Pu 0.008 kN; limiting speed 80000 r/min and mass 2 g. The open W 604 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 W604 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 W604 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 — W604 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W604 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 4 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 W604 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 W604?", "a": "SKF W 604 measures 4×12×4 mm (0.157×0.472×0.157 in), about 2 g, C 0.54 kN." }, { "q": "What does the W in W 604 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 W604 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 W604?", "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": "W604-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 4×12×4 mm envelope and equivalent catalogue ratings; W 604-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W604-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 4×12×4 mm envelope and equivalent catalogue ratings; W 604-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W604", "W 604" ], "locale_variants": {} }, { "sku": "W624-2RS", "brand": "SKF", "manufacturer_designation": "W 624-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 4, "D_mm": 13, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.741, "static_load_kN": 0.25, "fatigue_load_limit_kN": 0.011, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 3.05, "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 final digit is the bore in millimetres: 624 fits a 4 mm shaft (direct-number miniature spelling). Envelope 4×13×5 mm (0.157×0.512×0.197 in), C 0.741 kN, C0 0.25 kN, Pu 0.011 kN; limiting speed 32000 r/min and mass 3.05 g. SKF catalogues the sealed execution as W 624-2RS1: 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 — W624-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W624-2RS 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: W624-2RS is quoted at C 0.741 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 W624-2RS; standard fill is industrial grease unless specified otherwise.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 624-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The fatigue load limit is 0.011 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 W624-2RS?", "a": "SKF W 624-2RS1 measures 4×13×5 mm (0.157×0.512×0.197 in), about 3.05 g, C 0.741 kN." }, { "q": "What does the W in W 624-2RS1 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 W624-2RS?", "a": "The envelope matches, but stainless rates lower (C 0.741 kN for W 624-2RS1); 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": "W624-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 4×13×5 mm envelope and equivalent catalogue ratings; W 624-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W624-2RS", "W 624-2RS1" ], "locale_variants": {} }, { "sku": "W624-ZZ", "brand": "SKF", "manufacturer_designation": "W 624-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 4, "D_mm": 13, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.741, "static_load_kN": 0.25, "fatigue_load_limit_kN": 0.011, "reference_speed_rpm": 110000, "limiting_speed_rpm": 56000, "max_rpm": 56000, "weight_g": 2.95, "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 final digit is the bore in millimetres: 624 fits a 4 mm shaft (direct-number miniature spelling). Envelope 4×13×5 mm (0.157×0.512×0.197 in), C 0.741 kN, C0 0.25 kN, Pu 0.011 kN; limiting speed 56000 r/min and mass 2.95 g. SKF spells the double shield W 624-2Z (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": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W624-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W624-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 W624-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 — W624-ZZ is not marine-grade stainless.", "Catalogue ratings for W624-ZZ (C 0.741 kN, C0 0.25 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.", "Mount by heating the inner ring (max 120 °C) — driving W624-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W624-ZZ?", "a": "SKF W 624-2Z measures 4×13×5 mm (0.157×0.512×0.197 in), about 2.95 g, C 0.741 kN." }, { "q": "What does the W in W 624-2Z 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 W624-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W624-ZZ?", "a": "The envelope matches, but stainless rates lower (C 0.741 kN for W 624-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W624-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 4×13×5 mm envelope and equivalent catalogue ratings; W 624-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W624-ZZ", "W 624-2Z" ], "locale_variants": {} }, { "sku": "W634-2RS", "brand": "SKF", "manufacturer_designation": "W 634-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 4, "D_mm": 16, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.265, "fatigue_load_limit_kN": 0.011, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 5.15, "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 final digit is the bore in millimetres: 634 fits a 4 mm shaft (direct-number miniature spelling). Envelope 4×16×5 mm (0.157×0.63×0.197 in), C 0.761 kN, C0 0.265 kN, Pu 0.011 kN; limiting speed 30000 r/min and mass 5.15 g. SKF catalogues the sealed execution as W 634-2RS1: 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 W634-2RS 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 — W634-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W634-2RS 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: W634-2RS is quoted at C 0.761 kN versus the 5 mm-wide 52100 version — do not swap on dimensions alone.", "Do not preload W634-2RS 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 0.011 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 W634-2RS?", "a": "SKF W 634-2RS1 measures 4×16×5 mm (0.157×0.63×0.197 in), about 5.15 g, C 0.761 kN." }, { "q": "What does the W in W 634-2RS1 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 W634-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W634-2RS?", "a": "The envelope matches, but stainless rates lower (C 0.761 kN for W 634-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W634-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 4×16×5 mm envelope and equivalent catalogue ratings; W 634-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W634-2RS", "W 634-2RS1" ], "locale_variants": {} }, { "sku": "W634-ZZ", "brand": "SKF", "manufacturer_designation": "W 634-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 4, "D_mm": 16, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.265, "fatigue_load_limit_kN": 0.011, "reference_speed_rpm": 100000, "limiting_speed_rpm": 50000, "max_rpm": 50000, "weight_g": 5.15, "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 final digit is the bore in millimetres: 634 fits a 4 mm shaft (direct-number miniature spelling). Envelope 4×16×5 mm (0.157×0.63×0.197 in), C 0.761 kN, C0 0.265 kN, Pu 0.011 kN; limiting speed 50000 r/min and mass 5.15 g. SKF spells the double shield W 634-2Z (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 W634-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 W634-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 — W634-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W634-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 634-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Assign interference to the rotating ring: on a conventional shaft-mounted 4 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 W634-ZZ?", "a": "SKF W 634-2Z measures 4×16×5 mm (0.157×0.63×0.197 in), about 5.15 g, C 0.761 kN." }, { "q": "What does the W in W 634-2Z 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 W634-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W634-ZZ?", "a": "The envelope matches, but stainless rates lower (C 0.761 kN for W 634-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W634-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 4×16×5 mm envelope and equivalent catalogue ratings; W 634-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W634-ZZ", "W 634-2Z" ], "locale_variants": {} }, { "sku": "W627-5-ZZ", "brand": "SKF", "manufacturer_designation": "W 627/5-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 5, "D_mm": 8, "B_mm": 2.5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.121, "static_load_kN": 0.045, "fatigue_load_limit_kN": 0.002, "reference_speed_rpm": 140000, "limiting_speed_rpm": 70000, "max_rpm": 70000, "weight_g": 0.41, "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 bore is written directly after the slash as 5 mm (bores below 10 mm use the slash spelling). Envelope 5×8×2.5 mm (0.197×0.315×0.098 in), C 0.121 kN, C0 0.045 kN, Pu 0.002 kN; limiting speed 70000 r/min and mass 0.41 g. SKF spells the double shield W 627/5-2Z (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: W627-5-ZZ is quoted at C 0.121 kN versus the 2.5 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 W627-5-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W627-5-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 W627-5-ZZ inside the quoted grease temperature range.", "Do not preload W627-5-ZZ 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 W627-5-ZZ chamfer so the 2.5 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 W627-5-ZZ?", "a": "SKF W 627/5-2Z measures 5×8×2.5 mm (0.197×0.315×0.098 in), about 0.41 g, C 0.121 kN." }, { "q": "What does the W in W 627/5-2Z 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 W627-5-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 W627-5-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": [], "source_ref": "https://cdn.skfmediahub.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": [ "W627-5-ZZ", "W 627/5-2Z" ], "locale_variants": {} }, { "sku": "W618-5", "brand": "SKF", "manufacturer_designation": "W 618/5", "series": "61800-series", "type": "deep_groove", "d_mm": 5, "D_mm": 11, "B_mm": 3, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.403, "static_load_kN": 0.143, "fatigue_load_limit_kN": 0.006, "reference_speed_rpm": 120000, "limiting_speed_rpm": 75000, "max_rpm": 75000, "weight_g": 1.2, "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 bore is written directly after the slash as 5 mm (bores below 10 mm use the slash spelling). Envelope 5×11×3 mm (0.197×0.433×0.118 in), C 0.403 kN, C0 0.143 kN, Pu 0.006 kN; limiting speed 75000 r/min and mass 1.2 g. The open W 618/5 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 W618-5 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 — W618-5 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W618-5 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: W618-5 is quoted at C 0.403 kN versus the 3 mm-wide 52100 version — do not swap on dimensions alone.", "Assign interference to the rotating ring: on a conventional shaft-mounted 5 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 618/5-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W618-5?", "a": "SKF W 618/5 measures 5×11×3 mm (0.197×0.433×0.118 in), about 1.2 g, C 0.403 kN." }, { "q": "What does the W in W 618/5 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 W618-5?", "a": "The envelope matches, but stainless rates lower (C 0.403 kN for W 618/5); 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": [], "source_ref": "https://cdn.skfmediahub.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": [ "W618-5", "W 618/5" ], "locale_variants": {} }, { "sku": "W628-5-ZZ", "brand": "SKF", "manufacturer_designation": "W 628/5-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 5, "D_mm": 11, "B_mm": 4, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.403, "static_load_kN": 0.143, "fatigue_load_limit_kN": 0.006, "reference_speed_rpm": 120000, "limiting_speed_rpm": 60000, "max_rpm": 60000, "weight_g": 1.55, "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 62800-series, the bore is written directly after the slash as 5 mm (bores below 10 mm use the slash spelling). Envelope 5×11×4 mm (0.197×0.433×0.157 in), C 0.403 kN, C0 0.143 kN, Pu 0.006 kN; limiting speed 60000 r/min and mass 1.55 g. SKF spells the double shield W 628/5-2Z (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 W628-5-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: W628-5-ZZ is quoted at C 0.403 kN versus the 4 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 W628-5-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W628-5-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Do not preload W628-5-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 628/5-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W628-5-ZZ?", "a": "SKF W 628/5-2Z measures 5×11×4 mm (0.197×0.433×0.157 in), about 1.55 g, C 0.403 kN." }, { "q": "What does the W in W 628/5-2Z 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 W628-5-ZZ?", "a": "The envelope matches, but stainless rates lower (C 0.403 kN for W 628/5-2Z); 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": [], "source_ref": "https://cdn.skfmediahub.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": [ "W628-5-ZZ", "W 628/5-2Z" ], "locale_variants": {} }, { "sku": "W638-5-ZZ", "brand": "SKF", "manufacturer_designation": "W 638/5-2Z", "series": "63800-series", "type": "deep_groove", "d_mm": 5, "D_mm": 11, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.403, "static_load_kN": 0.143, "fatigue_load_limit_kN": 0.006, "reference_speed_rpm": 120000, "limiting_speed_rpm": 60000, "max_rpm": 60000, "weight_g": 1.85, "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 63800-series, the bore is written directly after the slash as 5 mm (bores below 10 mm use the slash spelling). Envelope 5×11×5 mm (0.197×0.433×0.197 in), C 0.403 kN, C0 0.143 kN, Pu 0.006 kN; limiting speed 60000 r/min and mass 1.85 g. SKF spells the double shield W 638/5-2Z (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": [ "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 — W638-5-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W638-5-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: W638-5-ZZ is quoted at C 0.403 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 W638-5-ZZ; standard fill is industrial grease unless specified otherwise.", "Catalogue ratings for W638-5-ZZ (C 0.403 kN, C0 0.143 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.", "Mount by heating the inner ring (max 120 °C) — driving W638-5-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W638-5-ZZ?", "a": "SKF W 638/5-2Z measures 5×11×5 mm (0.197×0.433×0.197 in), about 1.85 g, C 0.403 kN." }, { "q": "What does the W in W 638/5-2Z 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 W638-5-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 W638-5-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": [], "source_ref": "https://cdn.skfmediahub.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": [ "W638-5-ZZ", "W 638/5-2Z" ], "locale_variants": {} }, { "sku": "W619-5-2RS", "brand": "SKF", "manufacturer_designation": "W 619/5-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 5, "D_mm": 13, "B_mm": 4, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.335, "fatigue_load_limit_kN": 0.014, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 2.35, "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 bore is written directly after the slash as 5 mm (bores below 10 mm use the slash spelling). Envelope 5×13×4 mm (0.197×0.512×0.157 in), C 0.761 kN, C0 0.335 kN, Pu 0.014 kN; limiting speed 32000 r/min and mass 2.35 g. SKF catalogues the sealed execution as W 619/5-2RS1: 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: W619-5-2RS is quoted at C 0.761 kN versus the 4 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 W619-5-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W619-5-2RS 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 W619-5-2RS inside the quoted grease temperature range.", "Deep-groove geometry tolerates only minutes of misalignment; if the 13 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W619-5-2RS.", "Catalogue ratings for W619-5-2RS (C 0.761 kN, C0 0.335 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 W619-5-2RS?", "a": "SKF W 619/5-2RS1 measures 5×13×4 mm (0.197×0.512×0.157 in), about 2.35 g, C 0.761 kN." }, { "q": "What does the W in W 619/5-2RS1 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 W619-5-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W619-5-2RS?", "a": "The envelope matches, but stainless rates lower (C 0.761 kN for W 619/5-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W619-5-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 5×13×4 mm envelope and equivalent catalogue ratings; W 619/5-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-5", "equiv_brand": "SKF", "level": "full", "note": "Same 5×13×4 mm envelope and equivalent catalogue ratings; W 619/5 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-5-2RS", "W 619/5-2RS1" ], "locale_variants": {} }, { "sku": "W619-5-ZZ", "brand": "SKF", "manufacturer_designation": "W 619/5-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 5, "D_mm": 13, "B_mm": 4, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.335, "fatigue_load_limit_kN": 0.014, "reference_speed_rpm": 110000, "limiting_speed_rpm": 56000, "max_rpm": 56000, "weight_g": 2.35, "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 bore is written directly after the slash as 5 mm (bores below 10 mm use the slash spelling). Envelope 5×13×4 mm (0.197×0.512×0.157 in), C 0.761 kN, C0 0.335 kN, Pu 0.014 kN; limiting speed 56000 r/min and mass 2.35 g. SKF spells the double shield W 619/5-2Z (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": [ "The stainless steel is martensitic and MAGNETIC; do not reject W619-5-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: W619-5-ZZ is quoted at C 0.761 kN versus the 4 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 W619-5-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W619-5-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "The fatigue load limit is 0.014 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Do not preload W619-5-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 W619-5-ZZ?", "a": "SKF W 619/5-2Z measures 5×13×4 mm (0.197×0.512×0.157 in), about 2.35 g, C 0.761 kN." }, { "q": "What does the W in W 619/5-2Z 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 W619-5-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W619-5-ZZ?", "a": "The envelope matches, but stainless rates lower (C 0.761 kN for W 619/5-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W619-5-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 5×13×4 mm envelope and equivalent catalogue ratings; W 619/5-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-5", "equiv_brand": "SKF", "level": "full", "note": "Same 5×13×4 mm envelope and equivalent catalogue ratings; W 619/5 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-5-ZZ", "W 619/5-2Z" ], "locale_variants": {} }, { "sku": "W619-5", "brand": "SKF", "manufacturer_designation": "W 619/5", "series": "61900-series", "type": "deep_groove", "d_mm": 5, "D_mm": 13, "B_mm": 4, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.335, "fatigue_load_limit_kN": 0.014, "reference_speed_rpm": 110000, "limiting_speed_rpm": 70000, "max_rpm": 70000, "weight_g": 2.1, "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 61900-series, the bore is written directly after the slash as 5 mm (bores below 10 mm use the slash spelling). Envelope 5×13×4 mm (0.197×0.512×0.157 in), C 0.761 kN, C0 0.335 kN, Pu 0.014 kN; limiting speed 70000 r/min and mass 2.1 g. The open W 619/5 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 — W619-5 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W619-5 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: W619-5 is quoted at C 0.761 kN versus the 4 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 W619-5; standard fill is industrial grease unless specified otherwise.", "Mount by heating the inner ring (max 120 °C) — driving W619-5 home through the outer ring or balls brinells the raceways.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 619/5-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W619-5?", "a": "SKF W 619/5 measures 5×13×4 mm (0.197×0.512×0.157 in), about 2.1 g, C 0.761 kN." }, { "q": "What does the W in W 619/5 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 W619-5?", "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 W619-5; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W619-5-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 5×13×4 mm envelope and equivalent catalogue ratings; W 619/5-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-5-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 5×13×4 mm envelope and equivalent catalogue ratings; W 619/5-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-5", "W 619/5" ], "locale_variants": {} }, { "sku": "W605-2RS", "brand": "SKF", "manufacturer_designation": "W 605-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 5, "D_mm": 14, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.26, "fatigue_load_limit_kN": 0.011, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 3.45, "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 final digit is the bore in millimetres: 605 fits a 5 mm shaft (direct-number miniature spelling). Envelope 5×14×5 mm (0.197×0.551×0.197 in), C 0.761 kN, C0 0.26 kN, Pu 0.011 kN; limiting speed 30000 r/min and mass 3.45 g. SKF catalogues the sealed execution as W 605-2RS1: 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 W605-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W605-2RS 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 W605-2RS 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 — W605-2RS is not marine-grade stainless.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 605-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Mount by heating the inner ring (max 120 °C) — driving W605-2RS home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W605-2RS?", "a": "SKF W 605-2RS1 measures 5×14×5 mm (0.197×0.551×0.197 in), about 3.45 g, C 0.761 kN." }, { "q": "What does the W in W 605-2RS1 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 W605-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W605-2RS?", "a": "The envelope matches, but stainless rates lower (C 0.761 kN for W 605-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W605-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 5×14×5 mm envelope and equivalent catalogue ratings; W 605-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W605-2RS", "W 605-2RS1" ], "locale_variants": {} }, { "sku": "W605-ZZ", "brand": "SKF", "manufacturer_designation": "W 605-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 5, "D_mm": 14, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.26, "fatigue_load_limit_kN": 0.011, "reference_speed_rpm": 110000, "limiting_speed_rpm": 53000, "max_rpm": 53000, "weight_g": 3.35, "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 final digit is the bore in millimetres: 605 fits a 5 mm shaft (direct-number miniature spelling). Envelope 5×14×5 mm (0.197×0.551×0.197 in), C 0.761 kN, C0 0.26 kN, Pu 0.011 kN; limiting speed 53000 r/min and mass 3.35 g. SKF spells the double shield W 605-2Z (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 W605-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 W605-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 — W605-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W605-ZZ over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "Mount by heating the inner ring (max 120 °C) — driving W605-ZZ home through the outer ring or balls brinells the raceways.", "Catalogue ratings for W605-ZZ (C 0.761 kN, C0 0.26 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 W605-ZZ?", "a": "SKF W 605-2Z measures 5×14×5 mm (0.197×0.551×0.197 in), about 3.35 g, C 0.761 kN." }, { "q": "What does the W in W 605-2Z 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 W605-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 W605-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W605-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 5×14×5 mm envelope and equivalent catalogue ratings; W 605-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W605-ZZ", "W 605-2Z" ], "locale_variants": {} }, { "sku": "W625-2RS", "brand": "SKF", "manufacturer_designation": "W 625-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 5, "D_mm": 16, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.43, "static_load_kN": 0.63, "fatigue_load_limit_kN": 0.027, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 4.85, "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 final digit is the bore in millimetres: 625 fits a 5 mm shaft (direct-number miniature spelling). Envelope 5×16×5 mm (0.197×0.63×0.197 in), C 1.43 kN, C0 0.63 kN, Pu 0.027 kN; limiting speed 28000 r/min and mass 4.85 g. SKF catalogues the sealed execution as W 625-2RS1: 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 W625-2RS 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: W625-2RS is quoted at C 1.43 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 W625-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W625-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "The fatigue load limit is 0.027 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 0.027 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 W625-2RS?", "a": "SKF W 625-2RS1 measures 5×16×5 mm (0.197×0.63×0.197 in), about 4.85 g, C 1.43 kN." }, { "q": "What does the W in W 625-2RS1 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 W625-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W625-2RS?", "a": "The envelope matches, but stainless rates lower (C 1.43 kN for W 625-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W625-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 5×16×5 mm envelope and equivalent catalogue ratings; W 625-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W625", "equiv_brand": "SKF", "level": "full", "note": "Same 5×16×5 mm envelope and equivalent catalogue ratings; W 625 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W625-2RS", "W 625-2RS1" ], "locale_variants": {} }, { "sku": "W625-ZZ", "brand": "SKF", "manufacturer_designation": "W 625-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 5, "D_mm": 16, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.43, "static_load_kN": 0.63, "fatigue_load_limit_kN": 0.027, "reference_speed_rpm": 100000, "limiting_speed_rpm": 50000, "max_rpm": 50000, "weight_g": 4.85, "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 final digit is the bore in millimetres: 625 fits a 5 mm shaft (direct-number miniature spelling). Envelope 5×16×5 mm (0.197×0.63×0.197 in), C 1.43 kN, C0 0.63 kN, Pu 0.027 kN; limiting speed 50000 r/min and mass 4.85 g. SKF spells the double shield W 625-2Z (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 — W625-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W625-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: W625-ZZ is quoted at C 1.43 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 W625-ZZ; standard fill is industrial grease unless specified otherwise.", "Catalogue ratings for W625-ZZ (C 1.43 kN, C0 0.63 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 5 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 W625-ZZ?", "a": "SKF W 625-2Z measures 5×16×5 mm (0.197×0.63×0.197 in), about 4.85 g, C 1.43 kN." }, { "q": "What does the W in W 625-2Z 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 W625-ZZ?", "a": "The envelope matches, but stainless rates lower (C 1.43 kN for W 625-2Z); 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": "W625-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 5×16×5 mm envelope and equivalent catalogue ratings; W 625-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W625", "equiv_brand": "SKF", "level": "full", "note": "Same 5×16×5 mm envelope and equivalent catalogue ratings; W 625 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W625-ZZ", "W 625-2Z" ], "locale_variants": {} }, { "sku": "W625", "brand": "SKF", "manufacturer_designation": "W 625", "series": "6200-series", "type": "deep_groove", "d_mm": 5, "D_mm": 16, "B_mm": 5, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.43, "static_load_kN": 0.63, "fatigue_load_limit_kN": 0.027, "reference_speed_rpm": 100000, "limiting_speed_rpm": 63000, "max_rpm": 63000, "weight_g": 4.4, "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 final digit is the bore in millimetres: 625 fits a 5 mm shaft (direct-number miniature spelling). Envelope 5×16×5 mm (0.197×0.63×0.197 in), C 1.43 kN, C0 0.63 kN, Pu 0.027 kN; limiting speed 63000 r/min and mass 4.4 g. The open W 625 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 W625; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W625 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 W625 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 — W625 is not marine-grade stainless.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 625-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "The fatigue load limit is 0.027 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 W625?", "a": "SKF W 625 measures 5×16×5 mm (0.197×0.63×0.197 in), about 4.4 g, C 1.43 kN." }, { "q": "What does the W in W 625 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 W625 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": "W625-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 5×16×5 mm envelope and equivalent catalogue ratings; W 625-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W625-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 5×16×5 mm envelope and equivalent catalogue ratings; W 625-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W625", "W 625" ], "locale_variants": {} }, { "sku": "W627-6-ZZ", "brand": "SKF", "manufacturer_designation": "W 627/6-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 6, "D_mm": 10, "B_mm": 3, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.286, "static_load_kN": 0.112, "fatigue_load_limit_kN": 0.005, "reference_speed_rpm": 120000, "limiting_speed_rpm": 60000, "max_rpm": 60000, "weight_g": 0.72, "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 6200-series, the bore is written directly after the slash as 6 mm (bores below 10 mm use the slash spelling). Envelope 6×10×3 mm (0.236×0.394×0.118 in), C 0.286 kN, C0 0.112 kN, Pu 0.005 kN; limiting speed 60000 r/min and mass 0.72 g. SKF spells the double shield W 627/6-2Z (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 W627-6-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 — W627-6-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W627-6-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: W627-6-ZZ is quoted at C 0.286 kN versus the 3 mm-wide 52100 version — do not swap on dimensions alone.", "Catalogue ratings for W627-6-ZZ (C 0.286 kN, C0 0.112 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 W627-6-ZZ chamfer so the 3 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 W627-6-ZZ?", "a": "SKF W 627/6-2Z measures 6×10×3 mm (0.236×0.394×0.118 in), about 0.72 g, C 0.286 kN." }, { "q": "What does the W in W 627/6-2Z 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 W627-6-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 W627-6-ZZ; add seals and food-grade grease for wet positions." } ], "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": [ "W627-6-ZZ", "W 627/6-2Z" ], "locale_variants": {} }, { "sku": "W618-6", "brand": "SKF", "manufacturer_designation": "W 618/6", "series": "61800-series", "type": "deep_groove", "d_mm": 6, "D_mm": 13, "B_mm": 3.5, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.618, "static_load_kN": 0.224, "fatigue_load_limit_kN": 0.01, "reference_speed_rpm": 110000, "limiting_speed_rpm": 67000, "max_rpm": 67000, "weight_g": 1.8, "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, the bore is written directly after the slash as 6 mm (bores below 10 mm use the slash spelling). Envelope 6×13×3.5 mm (0.236×0.512×0.138 in), C 0.618 kN, C0 0.224 kN, Pu 0.01 kN; limiting speed 67000 r/min and mass 1.8 g. The open W 618/6 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: W618-6 is quoted at C 0.618 kN versus the 3.5 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 W618-6; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W618-6 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 W618-6 inside the quoted grease temperature range.", "Mount by heating the inner ring (max 120 °C) — driving W618-6 home through the outer ring or balls brinells the raceways.", "At 6 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 W618-6?", "a": "SKF W 618/6 measures 6×13×3.5 mm (0.236×0.512×0.138 in), about 1.8 g, C 0.618 kN." }, { "q": "What does the W in W 618/6 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 W618-6 typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "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": [ "W618-6", "W 618/6" ], "locale_variants": {} }, { "sku": "W628-6-2RS", "brand": "SKF", "manufacturer_designation": "W 628/6-2RS1", "series": "62800-series", "type": "deep_groove", "d_mm": 6, "D_mm": 13, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.618, "static_load_kN": 0.224, "fatigue_load_limit_kN": 0.01, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 2.55, "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 62800-series, the bore is written directly after the slash as 6 mm (bores below 10 mm use the slash spelling). Envelope 6×13×5 mm (0.236×0.512×0.197 in), C 0.618 kN, C0 0.224 kN, Pu 0.01 kN; limiting speed 30000 r/min and mass 2.55 g. SKF catalogues the sealed execution as W 628/6-2RS1: 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 W628-6-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W628-6-2RS 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 W628-6-2RS 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 — W628-6-2RS is not marine-grade stainless.", "Deep-groove geometry tolerates only minutes of misalignment; if the 13 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W628-6-2RS.", "Catalogue ratings for W628-6-2RS (C 0.618 kN, C0 0.224 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 W628-6-2RS?", "a": "SKF W 628/6-2RS1 measures 6×13×5 mm (0.236×0.512×0.197 in), about 2.55 g, C 0.618 kN." }, { "q": "What does the W in W 628/6-2RS1 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 W628-6-2RS?", "a": "The envelope matches, but stainless rates lower (C 0.618 kN for W 628/6-2RS1); 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": "W628-6-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 6×13×5 mm envelope and equivalent catalogue ratings; W 628/6-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W628-6-2RS", "W 628/6-2RS1" ], "locale_variants": {} }, { "sku": "W628-6-ZZ", "brand": "SKF", "manufacturer_designation": "W 628/6-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 6, "D_mm": 13, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.618, "static_load_kN": 0.224, "fatigue_load_limit_kN": 0.01, "reference_speed_rpm": 110000, "limiting_speed_rpm": 53000, "max_rpm": 53000, "weight_g": 2.55, "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 62800-series, the bore is written directly after the slash as 6 mm (bores below 10 mm use the slash spelling). Envelope 6×13×5 mm (0.236×0.512×0.197 in), C 0.618 kN, C0 0.224 kN, Pu 0.01 kN; limiting speed 53000 r/min and mass 2.55 g. SKF spells the double shield W 628/6-2Z (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": [ "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 — W628-6-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W628-6-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: W628-6-ZZ is quoted at C 0.618 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 W628-6-ZZ; standard fill is industrial grease unless specified otherwise.", "Mount by heating the inner ring (max 120 °C) — driving W628-6-ZZ home through the outer ring or balls brinells the raceways.", "Do not preload W628-6-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 W628-6-ZZ?", "a": "SKF W 628/6-2Z measures 6×13×5 mm (0.236×0.512×0.197 in), about 2.55 g, C 0.618 kN." }, { "q": "What does the W in W 628/6-2Z 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 W628-6-ZZ?", "a": "The envelope matches, but stainless rates lower (C 0.618 kN for W 628/6-2Z); 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": "W628-6-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 6×13×5 mm envelope and equivalent catalogue ratings; W 628/6-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W628-6-ZZ", "W 628/6-2Z" ], "locale_variants": {} }, { "sku": "W619-6-ZZ", "brand": "SKF", "manufacturer_designation": "W 619/6-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 6, "D_mm": 15, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.265, "fatigue_load_limit_kN": 0.011, "reference_speed_rpm": 100000, "limiting_speed_rpm": 50000, "max_rpm": 50000, "weight_g": 3.85, "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 bore is written directly after the slash as 6 mm (bores below 10 mm use the slash spelling). Envelope 6×15×5 mm (0.236×0.591×0.197 in), C 0.761 kN, C0 0.265 kN, Pu 0.011 kN; limiting speed 50000 r/min and mass 3.85 g. SKF spells the double shield W 619/6-2Z (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 — W619-6-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W619-6-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: W619-6-ZZ is quoted at C 0.761 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 W619-6-ZZ; standard fill is industrial grease unless specified otherwise.", "Mount by heating the inner ring (max 120 °C) — driving W619-6-ZZ home through the outer ring or balls brinells the raceways.", "Catalogue ratings for W619-6-ZZ (C 0.761 kN, C0 0.265 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 W619-6-ZZ?", "a": "SKF W 619/6-2Z measures 6×15×5 mm (0.236×0.591×0.197 in), about 3.85 g, C 0.761 kN." }, { "q": "What does the W in W 619/6-2Z 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 W619-6-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": "W619-6", "equiv_brand": "SKF", "level": "full", "note": "Same 6×15×5 mm envelope and equivalent catalogue ratings; W 619/6 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-6-ZZ", "W 619/6-2Z" ], "locale_variants": {} }, { "sku": "W619-6", "brand": "SKF", "manufacturer_designation": "W 619/6", "series": "61900-series", "type": "deep_groove", "d_mm": 6, "D_mm": 15, "B_mm": 5, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.265, "fatigue_load_limit_kN": 0.011, "reference_speed_rpm": 100000, "limiting_speed_rpm": 63000, "max_rpm": 63000, "weight_g": 3.5, "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 bore is written directly after the slash as 6 mm (bores below 10 mm use the slash spelling). Envelope 6×15×5 mm (0.236×0.591×0.197 in), C 0.761 kN, C0 0.265 kN, Pu 0.011 kN; limiting speed 63000 r/min and mass 3.5 g. The open W 619/6 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": [ "The stainless steel is martensitic and MAGNETIC; do not reject W619-6 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: W619-6 is quoted at C 0.761 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 W619-6; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W619-6 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Catalogue ratings for W619-6 (C 0.761 kN, C0 0.265 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.", "Mount by heating the inner ring (max 120 °C) — driving W619-6 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W619-6?", "a": "SKF W 619/6 measures 6×15×5 mm (0.236×0.591×0.197 in), about 3.5 g, C 0.761 kN." }, { "q": "What does the W in W 619/6 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 W619-6 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": "W619-6-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 6×15×5 mm envelope and equivalent catalogue ratings; W 619/6-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-6", "W 619/6" ], "locale_variants": {} }, { "sku": "W606-2RS", "brand": "SKF", "manufacturer_designation": "W 606-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 6, "D_mm": 17, "B_mm": 6, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.95, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 5.8, "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 6000-series, the final digit is the bore in millimetres: 606 fits a 6 mm shaft (direct-number miniature spelling). Envelope 6×17×6 mm (0.236×0.669×0.236 in), C 1.95 kN, C0 0.83 kN, Pu 0.036 kN; limiting speed 26000 r/min and mass 5.8 g. SKF catalogues the sealed execution as W 606-2RS1: 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": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W606-2RS is quoted at C 1.95 kN versus the 6 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 W606-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W606-2RS 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 W606-2RS inside the quoted grease temperature range.", "Assign interference to the rotating ring: on a conventional shaft-mounted 6 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 0.036 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 W606-2RS?", "a": "SKF W 606-2RS1 measures 6×17×6 mm (0.236×0.669×0.236 in), about 5.8 g, C 1.95 kN." }, { "q": "What does the W in W 606-2RS1 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 W606-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W606-2RS?", "a": "The envelope matches, but stainless rates lower (C 1.95 kN for W 606-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W606-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 6×17×6 mm envelope and equivalent catalogue ratings; W 606-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W606-2RS", "W 606-2RS1" ], "locale_variants": {} }, { "sku": "W606-ZZ", "brand": "SKF", "manufacturer_designation": "W 606-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 6, "D_mm": 17, "B_mm": 6, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.95, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 95000, "limiting_speed_rpm": 48000, "max_rpm": 48000, "weight_g": 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 6000-series, the final digit is the bore in millimetres: 606 fits a 6 mm shaft (direct-number miniature spelling). Envelope 6×17×6 mm (0.236×0.669×0.236 in), C 1.95 kN, C0 0.83 kN, Pu 0.036 kN; limiting speed 48000 r/min and mass 6 g. SKF spells the double shield W 606-2Z (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 W606-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 — W606-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W606-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: W606-ZZ is quoted at C 1.95 kN versus the 6 mm-wide 52100 version — do not swap on dimensions alone.", "At 6 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 W606-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W606-ZZ?", "a": "SKF W 606-2Z measures 6×17×6 mm (0.236×0.669×0.236 in), about 6 g, C 1.95 kN." }, { "q": "What does the W in W 606-2Z 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 W606-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W606-ZZ?", "a": "The envelope matches, but stainless rates lower (C 1.95 kN for W 606-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W606-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 6×17×6 mm envelope and equivalent catalogue ratings; W 606-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W606-ZZ", "W 606-2Z" ], "locale_variants": {} }, { "sku": "W626-2RS", "brand": "SKF", "manufacturer_designation": "W 626-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 6, "D_mm": 19, "B_mm": 6, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.53, "static_load_kN": 0.585, "fatigue_load_limit_kN": 0.025, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 7.65, "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 final digit is the bore in millimetres: 626 fits a 6 mm shaft (direct-number miniature spelling). Envelope 6×19×6 mm (0.236×0.748×0.236 in), C 1.53 kN, C0 0.585 kN, Pu 0.025 kN; limiting speed 24000 r/min and mass 7.65 g. SKF catalogues the sealed execution as W 626-2RS1: 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 W626-2RS 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 W626-2RS 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 — W626-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W626-2RS 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 6 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 19 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W626-2RS." ], "faq": [ { "q": "What are the dimensions of the stainless W626-2RS?", "a": "SKF W 626-2RS1 measures 6×19×6 mm (0.236×0.748×0.236 in), about 7.65 g, C 1.53 kN." }, { "q": "What does the W in W 626-2RS1 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 W626-2RS 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 W626-2RS?", "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": "W626-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 6×19×6 mm envelope and equivalent catalogue ratings; W 626-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W626", "equiv_brand": "SKF", "level": "full", "note": "Same 6×19×6 mm envelope and equivalent catalogue ratings; W 626 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W626-2RS", "W 626-2RS1" ], "locale_variants": {} }, { "sku": "W626-ZZ", "brand": "SKF", "manufacturer_designation": "W 626-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 6, "D_mm": 19, "B_mm": 6, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.53, "static_load_kN": 0.585, "fatigue_load_limit_kN": 0.025, "reference_speed_rpm": 85000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 7.75, "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 final digit is the bore in millimetres: 626 fits a 6 mm shaft (direct-number miniature spelling). Envelope 6×19×6 mm (0.236×0.748×0.236 in), C 1.53 kN, C0 0.585 kN, Pu 0.025 kN; limiting speed 43000 r/min and mass 7.75 g. SKF spells the double shield W 626-2Z (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 W626-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W626-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 W626-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 — W626-ZZ is not marine-grade stainless.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 626-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Deep-groove geometry tolerates only minutes of misalignment; if the 19 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W626-ZZ." ], "faq": [ { "q": "What are the dimensions of the stainless W626-ZZ?", "a": "SKF W 626-2Z measures 6×19×6 mm (0.236×0.748×0.236 in), about 7.75 g, C 1.53 kN." }, { "q": "What does the W in W 626-2Z 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 W626-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 W626-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W626-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 6×19×6 mm envelope and equivalent catalogue ratings; W 626-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W626", "equiv_brand": "SKF", "level": "full", "note": "Same 6×19×6 mm envelope and equivalent catalogue ratings; W 626 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W626-ZZ", "W 626-2Z" ], "locale_variants": {} }, { "sku": "W626", "brand": "SKF", "manufacturer_designation": "W 626", "series": "6200-series", "type": "deep_groove", "d_mm": 6, "D_mm": 19, "B_mm": 6, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.53, "static_load_kN": 0.585, "fatigue_load_limit_kN": 0.025, "reference_speed_rpm": 85000, "limiting_speed_rpm": 56000, "max_rpm": 56000, "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 6200-series, the final digit is the bore in millimetres: 626 fits a 6 mm shaft (direct-number miniature spelling). Envelope 6×19×6 mm (0.236×0.748×0.236 in), C 1.53 kN, C0 0.585 kN, Pu 0.025 kN; limiting speed 56000 r/min and mass 7.1 g. The open W 626 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: W626 is quoted at C 1.53 kN versus the 6 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 W626; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W626 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 W626 inside the quoted grease temperature range.", "At 6 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 6 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 W626?", "a": "SKF W 626 measures 6×19×6 mm (0.236×0.748×0.236 in), about 7.1 g, C 1.53 kN." }, { "q": "What does the W in W 626 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 W626?", "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 W626; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W626-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 6×19×6 mm envelope and equivalent catalogue ratings; W 626-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W626-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 6×19×6 mm envelope and equivalent catalogue ratings; W 626-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W626", "W 626" ], "locale_variants": {} }, { "sku": "W618-7", "brand": "SKF", "manufacturer_designation": "W 618/7", "series": "61800-series", "type": "deep_groove", "d_mm": 7, "D_mm": 14, "B_mm": 3.5, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.663, "static_load_kN": 0.26, "fatigue_load_limit_kN": 0.011, "reference_speed_rpm": 100000, "limiting_speed_rpm": 63000, "max_rpm": 63000, "weight_g": 2, "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 bore is written directly after the slash as 7 mm (bores below 10 mm use the slash spelling). Envelope 7×14×3.5 mm (0.276×0.551×0.138 in), C 0.663 kN, C0 0.26 kN, Pu 0.011 kN; limiting speed 63000 r/min and mass 2 g. The open W 618/7 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 W618-7 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: W618-7 is quoted at C 0.663 kN versus the 3.5 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 W618-7; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W618-7 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "The fatigue load limit is 0.011 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Catalogue ratings for W618-7 (C 0.663 kN, C0 0.26 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 W618-7?", "a": "SKF W 618/7 measures 7×14×3.5 mm (0.276×0.551×0.138 in), about 2 g, C 0.663 kN." }, { "q": "What does the W in W 618/7 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 W618-7 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 W618-7?", "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": "618-7", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×14×3.5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.663/0.26 kN vs 0.78/0.26 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W618-7", "W 618/7" ], "locale_variants": {} }, { "sku": "W628-7-ZZ", "brand": "SKF", "manufacturer_designation": "W 628/7-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 7, "D_mm": 14, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.663, "static_load_kN": 0.26, "fatigue_load_limit_kN": 0.011, "reference_speed_rpm": 100000, "limiting_speed_rpm": 50000, "max_rpm": 50000, "weight_g": 2.75, "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 62800-series, the bore is written directly after the slash as 7 mm (bores below 10 mm use the slash spelling). Envelope 7×14×5 mm (0.276×0.551×0.197 in), C 0.663 kN, C0 0.26 kN, Pu 0.011 kN; limiting speed 50000 r/min and mass 2.75 g. SKF spells the double shield W 628/7-2Z (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 W628-7-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W628-7-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 W628-7-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 — W628-7-ZZ is not marine-grade stainless.", "Catalogue ratings for W628-7-ZZ (C 0.663 kN, C0 0.26 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.", "Deep-groove geometry tolerates only minutes of misalignment; if the 14 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W628-7-ZZ." ], "faq": [ { "q": "What are the dimensions of the stainless W628-7-ZZ?", "a": "SKF W 628/7-2Z measures 7×14×5 mm (0.276×0.551×0.197 in), about 2.75 g, C 0.663 kN." }, { "q": "What does the W in W 628/7-2Z 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 W628-7-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 W628-7-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "628-7-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×14×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.663/0.26 kN vs 0.956/0.4 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W628-7-ZZ", "W 628/7-2Z" ], "locale_variants": {} }, { "sku": "W619-7-ZZ", "brand": "SKF", "manufacturer_designation": "W 619/7-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 7, "D_mm": 17, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.923, "static_load_kN": 0.365, "fatigue_load_limit_kN": 0.016, "reference_speed_rpm": 90000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 5.1, "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 61900-series, the bore is written directly after the slash as 7 mm (bores below 10 mm use the slash spelling). Envelope 7×17×5 mm (0.276×0.669×0.197 in), C 0.923 kN, C0 0.365 kN, Pu 0.016 kN; limiting speed 45000 r/min and mass 5.1 g. SKF spells the double shield W 619/7-2Z (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": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W619-7-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W619-7-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 W619-7-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 — W619-7-ZZ is not marine-grade stainless.", "Deep-groove geometry tolerates only minutes of misalignment; if the 17 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W619-7-ZZ.", "Fillet radii must clear the W619-7-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 W619-7-ZZ?", "a": "SKF W 619/7-2Z measures 7×17×5 mm (0.276×0.669×0.197 in), about 5.1 g, C 0.923 kN." }, { "q": "What does the W in W 619/7-2Z 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 W619-7-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 W619-7-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "619-7-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.923/0.365 kN vs 1.06/0.375 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-7", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.923/0.365 kN vs 1.06/0.375 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-7", "equiv_brand": "SKF", "level": "full", "note": "Same 7×17×5 mm envelope and equivalent catalogue ratings; W 619/7 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-7-ZZ", "W 619/7-2Z" ], "locale_variants": {} }, { "sku": "W619-7", "brand": "SKF", "manufacturer_designation": "W 619/7", "series": "61900-series", "type": "deep_groove", "d_mm": 7, "D_mm": 17, "B_mm": 5, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.923, "static_load_kN": 0.365, "fatigue_load_limit_kN": 0.016, "reference_speed_rpm": 90000, "limiting_speed_rpm": 56000, "max_rpm": 56000, "weight_g": 4.8, "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, the bore is written directly after the slash as 7 mm (bores below 10 mm use the slash spelling). Envelope 7×17×5 mm (0.276×0.669×0.197 in), C 0.923 kN, C0 0.365 kN, Pu 0.016 kN; limiting speed 56000 r/min and mass 4.8 g. The open W 619/7 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": [ "Stainless bearings carry lower load ratings than chrome steel of the same envelope: W619-7 is quoted at C 0.923 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 W619-7; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W619-7 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 W619-7 inside the quoted grease temperature range.", "At 7 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.", "Catalogue ratings for W619-7 (C 0.923 kN, C0 0.365 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 W619-7?", "a": "SKF W 619/7 measures 7×17×5 mm (0.276×0.669×0.197 in), about 4.8 g, C 0.923 kN." }, { "q": "What does the W in W 619/7 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 W619-7?", "a": "The envelope matches, but stainless rates lower (C 0.923 kN for W 619/7); 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": "619-7-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.923/0.365 kN vs 1.06/0.375 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-7", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.923/0.365 kN vs 1.06/0.375 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-7-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×17×5 mm envelope and equivalent catalogue ratings; W 619/7-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-7", "W 619/7" ], "locale_variants": {} }, { "sku": "W607-2RS", "brand": "SKF", "manufacturer_designation": "W 607-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 7, "D_mm": 19, "B_mm": 6, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.53, "static_load_kN": 0.585, "fatigue_load_limit_kN": 0.025, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 7.25, "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 final digit is the bore in millimetres: 607 fits a 7 mm shaft (direct-number miniature spelling). Envelope 7×19×6 mm (0.276×0.748×0.236 in), C 1.53 kN, C0 0.585 kN, Pu 0.025 kN; limiting speed 24000 r/min and mass 7.25 g. SKF catalogues the sealed execution as W 607-2RS1: 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 W607-2RS 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: W607-2RS is quoted at C 1.53 kN versus the 6 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 W607-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W607-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Assign interference to the rotating ring: on a conventional shaft-mounted 7 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 W607-2RS home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W607-2RS?", "a": "SKF W 607-2RS1 measures 7×19×6 mm (0.276×0.748×0.236 in), about 7.25 g, C 1.53 kN." }, { "q": "What does the W in W 607-2RS1 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 W607-2RS 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 W607-2RS?", "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": "607", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; W 607-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W607", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; W 607 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W607-2RS", "W 607-2RS1" ], "locale_variants": {} }, { "sku": "W607-ZZ", "brand": "SKF", "manufacturer_designation": "W 607-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 7, "D_mm": 19, "B_mm": 6, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.53, "static_load_kN": 0.585, "fatigue_load_limit_kN": 0.025, "reference_speed_rpm": 85000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 7.35, "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 final digit is the bore in millimetres: 607 fits a 7 mm shaft (direct-number miniature spelling). Envelope 7×19×6 mm (0.276×0.748×0.236 in), C 1.53 kN, C0 0.585 kN, Pu 0.025 kN; limiting speed 43000 r/min and mass 7.35 g. SKF spells the double shield W 607-2Z (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: W607-ZZ is quoted at C 1.53 kN versus the 6 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 W607-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W607-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 W607-ZZ inside the quoted grease temperature range.", "Do not preload W607-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 W607-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 W607-ZZ?", "a": "SKF W 607-2Z measures 7×19×6 mm (0.276×0.748×0.236 in), about 7.35 g, C 1.53 kN." }, { "q": "What does the W in W 607-2Z 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 W607-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 W607-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": "607", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; W 607-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W607", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; W 607 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W607-ZZ", "W 607-2Z" ], "locale_variants": {} }, { "sku": "W607", "brand": "SKF", "manufacturer_designation": "W 607", "series": "6000-series", "type": "deep_groove", "d_mm": 7, "D_mm": 19, "B_mm": 6, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.53, "static_load_kN": 0.585, "fatigue_load_limit_kN": 0.025, "reference_speed_rpm": 85000, "limiting_speed_rpm": 56000, "max_rpm": 56000, "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 6000-series, the final digit is the bore in millimetres: 607 fits a 7 mm shaft (direct-number miniature spelling). Envelope 7×19×6 mm (0.276×0.748×0.236 in), C 1.53 kN, C0 0.585 kN, Pu 0.025 kN; limiting speed 56000 r/min and mass 6.7 g. The open W 607 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 W607 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 — W607 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W607 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: W607 is quoted at C 1.53 kN versus the 6 mm-wide 52100 version — do not swap on dimensions alone.", "Fillet radii must clear the W607 chamfer so the 6 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Catalogue ratings for W607 (C 1.53 kN, C0 0.585 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 W607?", "a": "SKF W 607 measures 7×19×6 mm (0.276×0.748×0.236 in), about 6.7 g, C 1.53 kN." }, { "q": "What does the W in W 607 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 W607?", "a": "The envelope matches, but stainless rates lower (C 1.53 kN for W 607); 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": "607", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.53/0.585 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W607-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; W 607-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W607-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×19×6 mm envelope and equivalent catalogue ratings; W 607-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W607", "W 607" ], "locale_variants": {} }, { "sku": "W627-2RS", "brand": "SKF", "manufacturer_designation": "W 627-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 7, "D_mm": 22, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.99, "static_load_kN": 0.78, "fatigue_load_limit_kN": 0.034, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 12, "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 final digit is the bore in millimetres: 627 fits a 7 mm shaft (direct-number miniature spelling). Envelope 7×22×7 mm (0.276×0.866×0.276 in), C 1.99 kN, C0 0.78 kN, Pu 0.034 kN; limiting speed 22000 r/min and mass 12 g. SKF catalogues the sealed execution as W 627-2RS1: 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 W627-2RS 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 — W627-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W627-2RS 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: W627-2RS is quoted at C 1.99 kN versus the 7 mm-wide 52100 version — do not swap on dimensions alone.", "Fillet radii must clear the W627-2RS chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 0.034 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 W627-2RS?", "a": "SKF W 627-2RS1 measures 7×22×7 mm (0.276×0.866×0.276 in), about 12 g, C 1.99 kN." }, { "q": "What does the W in W 627-2RS1 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 W627-2RS 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": "627", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "627-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "627-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "627-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; W 627-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W627", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; W 627 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W627-2RS", "W 627-2RS1" ], "locale_variants": {} }, { "sku": "W627-ZZ", "brand": "SKF", "manufacturer_designation": "W 627-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 7, "D_mm": 22, "B_mm": 7, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.99, "static_load_kN": 0.78, "fatigue_load_limit_kN": 0.034, "reference_speed_rpm": 75000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 12, "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 final digit is the bore in millimetres: 627 fits a 7 mm shaft (direct-number miniature spelling). Envelope 7×22×7 mm (0.276×0.866×0.276 in), C 1.99 kN, C0 0.78 kN, Pu 0.034 kN; limiting speed 38000 r/min and mass 12 g. SKF spells the double shield W 627-2Z (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 W627-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 W627-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 — W627-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W627-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 627-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Do not preload W627-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 W627-ZZ?", "a": "SKF W 627-2Z measures 7×22×7 mm (0.276×0.866×0.276 in), about 12 g, C 1.99 kN." }, { "q": "What does the W in W 627-2Z 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 W627-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 W627-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": "627", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "627-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "627-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "627-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; W 627-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W627", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; W 627 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W627-ZZ", "W 627-2Z" ], "locale_variants": {} }, { "sku": "W627", "brand": "SKF", "manufacturer_designation": "W 627", "series": "6200-series", "type": "deep_groove", "d_mm": 7, "D_mm": 22, "B_mm": 7, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.99, "static_load_kN": 0.78, "fatigue_load_limit_kN": 0.034, "reference_speed_rpm": 75000, "limiting_speed_rpm": 48000, "max_rpm": 48000, "weight_g": 12, "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 final digit is the bore in millimetres: 627 fits a 7 mm shaft (direct-number miniature spelling). Envelope 7×22×7 mm (0.276×0.866×0.276 in), C 1.99 kN, C0 0.78 kN, Pu 0.034 kN; limiting speed 48000 r/min and mass 12 g. The open W 627 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 W627 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: W627 is quoted at C 1.99 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 W627; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W627 or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Catalogue ratings for W627 (C 1.99 kN, C0 0.78 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 W627 (C 1.99 kN, C0 0.78 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 W627?", "a": "SKF W 627 measures 7×22×7 mm (0.276×0.866×0.276 in), about 12 g, C 1.99 kN." }, { "q": "What does the W in W 627 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 W627; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W627?", "a": "The envelope matches, but stainless rates lower (C 1.99 kN for W 627); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "627", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "627-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "627-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "627-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W627-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; W 627-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W627-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 7×22×7 mm envelope and equivalent catalogue ratings; W 627-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W627", "W 627" ], "locale_variants": {} }, { "sku": "W637-8-ZZ", "brand": "SKF", "manufacturer_designation": "W 637/8-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 8, "D_mm": 12, "B_mm": 3.5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.312, "static_load_kN": 0.14, "fatigue_load_limit_kN": 0.006, "reference_speed_rpm": 100000, "limiting_speed_rpm": 53000, "max_rpm": 53000, "weight_g": 1.05, "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 bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). Envelope 8×12×3.5 mm (0.315×0.472×0.138 in), C 0.312 kN, C0 0.14 kN, Pu 0.006 kN; limiting speed 53000 r/min and mass 1.05 g. SKF spells the double shield W 637/8-2Z (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 — W637-8-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W637-8-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: W637-8-ZZ is quoted at C 0.312 kN versus the 3.5 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 W637-8-ZZ; standard fill is industrial grease unless specified otherwise.", "At 8 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 W637-8-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W637-8-ZZ?", "a": "SKF W 637/8-2Z measures 8×12×3.5 mm (0.315×0.472×0.138 in), about 1.05 g, C 0.312 kN." }, { "q": "What does the W in W 637/8-2Z 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 W637-8-ZZ typically used?", "a": "Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture." } ], "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": [ "W637-8-ZZ", "W 637/8-2Z" ], "locale_variants": {} }, { "sku": "W618-8", "brand": "SKF", "manufacturer_designation": "W 618/8", "series": "61800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 16, "B_mm": 4, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.715, "static_load_kN": 0.3, "fatigue_load_limit_kN": 0.012, "reference_speed_rpm": 90000, "limiting_speed_rpm": 56000, "max_rpm": 56000, "weight_g": 3.1, "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, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). Envelope 8×16×4 mm (0.315×0.63×0.157 in), C 0.715 kN, C0 0.3 kN, Pu 0.012 kN; limiting speed 56000 r/min and mass 3.1 g. The open W 618/8 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 — W618-8 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W618-8 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: W618-8 is quoted at C 0.715 kN versus the 4 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 W618-8; standard fill is industrial grease unless specified otherwise.", "At 8 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.", "Catalogue ratings for W618-8 (C 0.715 kN, C0 0.3 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 W618-8?", "a": "SKF W 618/8 measures 8×16×4 mm (0.315×0.63×0.157 in), about 3.1 g, C 0.715 kN." }, { "q": "What does the W in W 618/8 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 W618-8 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": "618-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×4 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.715/0.3 kN vs 0.819/0.3 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W618-8", "W 618/8" ], "locale_variants": {} }, { "sku": "W628-8-2RS", "brand": "SKF", "manufacturer_designation": "W 628/8-2RS1", "series": "62800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 16, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.715, "static_load_kN": 0.3, "fatigue_load_limit_kN": 0.012, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 3.85, "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 62800-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). Envelope 8×16×5 mm (0.315×0.63×0.197 in), C 0.715 kN, C0 0.3 kN, Pu 0.012 kN; limiting speed 26000 r/min and mass 3.85 g. SKF catalogues the sealed execution as W 628/8-2RS1: 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 W628-8-2RS 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: W628-8-2RS is quoted at C 0.715 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 W628-8-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W628-8-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Deep-groove geometry tolerates only minutes of misalignment; if the 16 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W628-8-2RS.", "Do not preload W628-8-2RS 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 W628-8-2RS?", "a": "SKF W 628/8-2RS1 measures 8×16×5 mm (0.315×0.63×0.197 in), about 3.85 g, C 0.715 kN." }, { "q": "What does the W in W 628/8-2RS1 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 W628-8-2RS?", "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 W628-8-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "628-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.715/0.3 kN vs 1.33/0.57 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "628-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.715/0.3 kN vs 1.33/0.57 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W628-8-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×16×5 mm envelope and equivalent catalogue ratings; W 628/8-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W628-8-2RS", "W 628/8-2RS1" ], "locale_variants": {} }, { "sku": "W628-8-ZZ", "brand": "SKF", "manufacturer_designation": "W 628/8-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 16, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.715, "static_load_kN": 0.3, "fatigue_load_limit_kN": 0.012, "reference_speed_rpm": 90000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 3.75, "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 62800-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). Envelope 8×16×5 mm (0.315×0.63×0.197 in), C 0.715 kN, C0 0.3 kN, Pu 0.012 kN; limiting speed 45000 r/min and mass 3.75 g. SKF spells the double shield W 628/8-2Z (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: W628-8-ZZ is quoted at C 0.715 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 W628-8-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W628-8-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 W628-8-ZZ inside the quoted grease temperature range.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 628/8-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Catalogue ratings for W628-8-ZZ (C 0.715 kN, C0 0.3 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 W628-8-ZZ?", "a": "SKF W 628/8-2Z measures 8×16×5 mm (0.315×0.63×0.197 in), about 3.75 g, C 0.715 kN." }, { "q": "What does the W in W 628/8-2Z 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 W628-8-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 W628-8-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": "628-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.715/0.3 kN vs 1.33/0.57 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "628-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.715/0.3 kN vs 1.33/0.57 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W628-8-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×16×5 mm envelope and equivalent catalogue ratings; W 628/8-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W628-8-ZZ", "W 628/8-2Z" ], "locale_variants": {} }, { "sku": "W638-8-ZZ", "brand": "SKF", "manufacturer_designation": "W 638/8-2Z", "series": "63800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 16, "B_mm": 6, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.715, "static_load_kN": 0.3, "fatigue_load_limit_kN": 0.012, "reference_speed_rpm": 90000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 4.6, "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 63800-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). Envelope 8×16×6 mm (0.315×0.63×0.236 in), C 0.715 kN, C0 0.3 kN, Pu 0.012 kN; limiting speed 45000 r/min and mass 4.6 g. SKF spells the double shield W 638/8-2Z (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": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W638-8-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W638-8-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 W638-8-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 — W638-8-ZZ is not marine-grade stainless.", "Assign interference to the rotating ring: on a conventional shaft-mounted 8 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 8 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 W638-8-ZZ?", "a": "SKF W 638/8-2Z measures 8×16×6 mm (0.315×0.63×0.236 in), about 4.6 g, C 0.715 kN." }, { "q": "What does the W in W 638/8-2Z 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 W638-8-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 W638-8-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "638-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×16×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.715/0.3 kN vs 1.33/0.57 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W638-8-ZZ", "W 638/8-2Z" ], "locale_variants": {} }, { "sku": "W619-8-2RS", "brand": "SKF", "manufacturer_designation": "W 619/8-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 8, "D_mm": 19, "B_mm": 6, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.25, "static_load_kN": 0.455, "fatigue_load_limit_kN": 0.02, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 6.65, "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 bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). Envelope 8×19×6 mm (0.315×0.748×0.236 in), C 1.25 kN, C0 0.455 kN, Pu 0.02 kN; limiting speed 24000 r/min and mass 6.65 g. SKF catalogues the sealed execution as W 619/8-2RS1: 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 W619-8-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W619-8-2RS 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 W619-8-2RS 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 — W619-8-2RS is not marine-grade stainless.", "Deep-groove geometry tolerates only minutes of misalignment; if the 19 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W619-8-2RS.", "The fatigue load limit is 0.02 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 W619-8-2RS?", "a": "SKF W 619/8-2RS1 measures 8×19×6 mm (0.315×0.748×0.236 in), about 6.65 g, C 1.25 kN." }, { "q": "What does the W in W 619/8-2RS1 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 W619-8-2RS?", "a": "The envelope matches, but stainless rates lower (C 1.25 kN for W 619/8-2RS1); 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": "619-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 1.46/0.465 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 1.46/0.465 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 1.46/0.465 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; W 619/8-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-8", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; W 619/8 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-8-2RS", "W 619/8-2RS1" ], "locale_variants": {} }, { "sku": "W619-8-ZZ", "brand": "SKF", "manufacturer_designation": "W 619/8-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 8, "D_mm": 19, "B_mm": 6, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.25, "static_load_kN": 0.455, "fatigue_load_limit_kN": 0.02, "reference_speed_rpm": 85000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 6.75, "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 bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). Envelope 8×19×6 mm (0.315×0.748×0.236 in), C 1.25 kN, C0 0.455 kN, Pu 0.02 kN; limiting speed 43000 r/min and mass 6.75 g. SKF spells the double shield W 619/8-2Z (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 — W619-8-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W619-8-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: W619-8-ZZ is quoted at C 1.25 kN versus the 6 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 W619-8-ZZ; standard fill is industrial grease unless specified otherwise.", "Mount by heating the inner ring (max 120 °C) — driving W619-8-ZZ home through the outer ring or balls brinells the raceways.", "Do not preload W619-8-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 W619-8-ZZ?", "a": "SKF W 619/8-2Z measures 8×19×6 mm (0.315×0.748×0.236 in), about 6.75 g, C 1.25 kN." }, { "q": "What does the W in W 619/8-2Z 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 W619-8-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 W619-8-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": "619-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 1.46/0.465 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 1.46/0.465 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 1.46/0.465 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; W 619/8-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-8", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; W 619/8 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-8-ZZ", "W 619/8-2Z" ], "locale_variants": {} }, { "sku": "W619-8", "brand": "SKF", "manufacturer_designation": "W 619/8", "series": "61900-series", "type": "deep_groove", "d_mm": 8, "D_mm": 19, "B_mm": 6, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.25, "static_load_kN": 0.455, "fatigue_load_limit_kN": 0.02, "reference_speed_rpm": 85000, "limiting_speed_rpm": 53000, "max_rpm": 53000, "weight_g": 6.1, "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 61900-series, the bore is written directly after the slash as 8 mm (bores below 10 mm use the slash spelling). Envelope 8×19×6 mm (0.315×0.748×0.236 in), C 1.25 kN, C0 0.455 kN, Pu 0.02 kN; limiting speed 53000 r/min and mass 6.1 g. The open W 619/8 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 W619-8 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 — W619-8 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W619-8 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: W619-8 is quoted at C 1.25 kN versus the 6 mm-wide 52100 version — do not swap on dimensions alone.", "Do not preload W619-8 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 W619-8 chamfer so the 6 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 W619-8?", "a": "SKF W 619/8 measures 8×19×6 mm (0.315×0.748×0.236 in), about 6.1 g, C 1.25 kN." }, { "q": "What does the W in W 619/8 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 W619-8?", "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 W619-8; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "619-8-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 1.46/0.465 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 1.46/0.465 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-8", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 1.46/0.465 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "607-8-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×19×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.25/0.455 kN vs 2.34/0.95 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-8-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; W 619/8-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W619-8-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×19×6 mm envelope and equivalent catalogue ratings; W 619/8-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-8", "W 619/8" ], "locale_variants": {} }, { "sku": "W608-2RS", "brand": "SKF", "manufacturer_designation": "W 608-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 8, "D_mm": 22, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.99, "static_load_kN": 0.78, "fatigue_load_limit_kN": 0.034, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 12, "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 final digit is the bore in millimetres: 608 fits a 8 mm shaft (direct-number miniature spelling). Envelope 8×22×7 mm (0.315×0.866×0.276 in), C 1.99 kN, C0 0.78 kN, Pu 0.034 kN; limiting speed 22000 r/min and mass 12 g. SKF catalogues the sealed execution as W 608-2RS1: 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: W608-2RS is quoted at C 1.99 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 W608-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W608-2RS 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 W608-2RS inside the quoted grease temperature range.", "Deep-groove geometry tolerates only minutes of misalignment; if the 22 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W608-2RS.", "Mount by heating the inner ring (max 120 °C) — driving W608-2RS home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W608-2RS?", "a": "SKF W 608-2RS1 measures 8×22×7 mm (0.315×0.866×0.276 in), about 12 g, C 1.99 kN." }, { "q": "What does the W in W 608-2RS1 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 W608-2RS?", "a": "The envelope matches, but stainless rates lower (C 1.99 kN for W 608-2RS1); 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": "608", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "608-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "608-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "608-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; W 608-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W608", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; W 608 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W608-2RS", "W 608-2RS1" ], "locale_variants": {} }, { "sku": "W608-ZZ", "brand": "SKF", "manufacturer_designation": "W 608-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 8, "D_mm": 22, "B_mm": 7, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.99, "static_load_kN": 0.78, "fatigue_load_limit_kN": 0.034, "reference_speed_rpm": 75000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 12, "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 final digit is the bore in millimetres: 608 fits a 8 mm shaft (direct-number miniature spelling). Envelope 8×22×7 mm (0.315×0.866×0.276 in), C 1.99 kN, C0 0.78 kN, Pu 0.034 kN; limiting speed 38000 r/min and mass 12 g. SKF spells the double shield W 608-2Z (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 W608-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 — W608-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W608-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: W608-ZZ is quoted at C 1.99 kN versus the 7 mm-wide 52100 version — do not swap on dimensions alone.", "At 8 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.", "Catalogue ratings for W608-ZZ (C 1.99 kN, C0 0.78 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 W608-ZZ?", "a": "SKF W 608-2Z measures 8×22×7 mm (0.315×0.866×0.276 in), about 12 g, C 1.99 kN." }, { "q": "What does the W in W 608-2Z 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 W608-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W608-ZZ?", "a": "The envelope matches, but stainless rates lower (C 1.99 kN for W 608-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "608", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "608-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "608-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "608-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; W 608-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W608", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; W 608 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W608-ZZ", "W 608-2Z" ], "locale_variants": {} }, { "sku": "W608", "brand": "SKF", "manufacturer_designation": "W 608", "series": "6000-series", "type": "deep_groove", "d_mm": 8, "D_mm": 22, "B_mm": 7, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.99, "static_load_kN": 0.78, "fatigue_load_limit_kN": 0.034, "reference_speed_rpm": 75000, "limiting_speed_rpm": 48000, "max_rpm": 48000, "weight_g": 11, "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 final digit is the bore in millimetres: 608 fits a 8 mm shaft (direct-number miniature spelling). Envelope 8×22×7 mm (0.315×0.866×0.276 in), C 1.99 kN, C0 0.78 kN, Pu 0.034 kN; limiting speed 48000 r/min and mass 11 g. The open W 608 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 W608 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 W608 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 — W608 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W608 over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "At 8 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 W608 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 W608?", "a": "SKF W 608 measures 8×22×7 mm (0.315×0.866×0.276 in), about 11 g, C 1.99 kN." }, { "q": "What does the W in W 608 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 W608?", "a": "The envelope matches, but stainless rates lower (C 1.99 kN for W 608); 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": "608", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "608-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "608-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "608-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.99/0.78 kN vs 3.45/1.37 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W608-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; W 608-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W608-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 8×22×7 mm envelope and equivalent catalogue ratings; W 608-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W608", "W 608" ], "locale_variants": {} }, { "sku": "W628-ZZ", "brand": "SKF", "manufacturer_designation": "W 628-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 8, "D_mm": 24, "B_mm": 8, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.47, "static_load_kN": 1.12, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 70000, "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 62800-series, the final digit is the bore in millimetres: 628 fits a 8 mm shaft (direct-number miniature spelling). Envelope 8×24×8 mm (0.315×0.945×0.315 in), C 2.47 kN, C0 1.12 kN, Pu 0.048 kN; limiting speed 36000 r/min and mass 18 g. SKF spells the double shield W 628-2Z (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 W628-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W628-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 W628-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 — W628-ZZ is not marine-grade stainless.", "Do not preload W628-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 628-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance." ], "faq": [ { "q": "What are the dimensions of the stainless W628-ZZ?", "a": "SKF W 628-2Z measures 8×24×8 mm (0.315×0.945×0.315 in), about 18 g, C 2.47 kN." }, { "q": "What does the W in W 628-2Z 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 W628-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": "628", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×24×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.47/1.12 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "628-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×24×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.47/1.12 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "628-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×24×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.47/1.12 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "628-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×24×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.47/1.12 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W628-ZZ", "W 628-2Z" ], "locale_variants": {} }, { "sku": "W618-9", "brand": "SKF", "manufacturer_designation": "W 618/9", "series": "61800-series", "type": "deep_groove", "d_mm": 9, "D_mm": 17, "B_mm": 4, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.335, "fatigue_load_limit_kN": 0.014, "reference_speed_rpm": 85000, "limiting_speed_rpm": 53000, "max_rpm": 53000, "weight_g": 3.4, "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 bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). Envelope 9×17×4 mm (0.354×0.669×0.157 in), C 0.761 kN, C0 0.335 kN, Pu 0.014 kN; limiting speed 53000 r/min and mass 3.4 g. The open W 618/9 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 W618-9 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 — W618-9 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W618-9 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: W618-9 is quoted at C 0.761 kN versus the 4 mm-wide 52100 version — do not swap on dimensions alone.", "Catalogue ratings for W618-9 (C 0.761 kN, C0 0.335 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.", "Mount by heating the inner ring (max 120 °C) — driving W618-9 home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W618-9?", "a": "SKF W 618/9 measures 9×17×4 mm (0.354×0.669×0.157 in), about 3.4 g, C 0.761 kN." }, { "q": "What does the W in W 618/9 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 W618-9 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 W618-9?", "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": "618-9", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×4 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.761/0.335 kN vs 0.871/0.34 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W618-9", "W 618/9" ], "locale_variants": {} }, { "sku": "W628-9-2RS", "brand": "SKF", "manufacturer_designation": "W 628/9-2RS1", "series": "62800-series", "type": "deep_groove", "d_mm": 9, "D_mm": 17, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.335, "fatigue_load_limit_kN": 0.014, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 4.2, "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 62800-series, the bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). Envelope 9×17×5 mm (0.354×0.669×0.197 in), C 0.761 kN, C0 0.335 kN, Pu 0.014 kN; limiting speed 24000 r/min and mass 4.2 g. SKF catalogues the sealed execution as W 628/9-2RS1: 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 W628-9-2RS 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 W628-9-2RS 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 — W628-9-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W628-9-2RS 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 17 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W628-9-2RS.", "Deep-groove geometry tolerates only minutes of misalignment; if the 17 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W628-9-2RS." ], "faq": [ { "q": "What are the dimensions of the stainless W628-9-2RS?", "a": "SKF W 628/9-2RS1 measures 9×17×5 mm (0.354×0.669×0.197 in), about 4.2 g, C 0.761 kN." }, { "q": "What does the W in W 628/9-2RS1 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 W628-9-2RS 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 W628-9-2RS?", "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": "628-9-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.761/0.335 kN vs 1.43/0.64 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "628-9-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.761/0.335 kN vs 1.43/0.64 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W628-9-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×17×5 mm envelope and equivalent catalogue ratings; W 628/9-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W628-9-2RS", "W 628/9-2RS1" ], "locale_variants": {} }, { "sku": "W628-9-ZZ", "brand": "SKF", "manufacturer_designation": "W 628/9-2Z", "series": "62800-series", "type": "deep_groove", "d_mm": 9, "D_mm": 17, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 0.761, "static_load_kN": 0.335, "fatigue_load_limit_kN": 0.014, "reference_speed_rpm": 85000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 4.2, "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 62800-series, the bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). Envelope 9×17×5 mm (0.354×0.669×0.197 in), C 0.761 kN, C0 0.335 kN, Pu 0.014 kN; limiting speed 43000 r/min and mass 4.2 g. SKF spells the double shield W 628/9-2Z (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": [ "The stainless steel is martensitic and MAGNETIC; do not reject W628-9-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: W628-9-ZZ is quoted at C 0.761 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 W628-9-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W628-9-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Catalogue ratings for W628-9-ZZ (C 0.761 kN, C0 0.335 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 9 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 W628-9-ZZ?", "a": "SKF W 628/9-2Z measures 9×17×5 mm (0.354×0.669×0.197 in), about 4.2 g, C 0.761 kN." }, { "q": "What does the W in W 628/9-2Z 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 W628-9-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 W628-9-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "628-9-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.761/0.335 kN vs 1.43/0.64 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "628-9-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (0.761/0.335 kN vs 1.43/0.64 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W628-9-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×17×5 mm envelope and equivalent catalogue ratings; W 628/9-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W628-9-ZZ", "W 628/9-2Z" ], "locale_variants": {} }, { "sku": "W619-9-ZZ", "brand": "SKF", "manufacturer_designation": "W 619/9-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 9, "D_mm": 20, "B_mm": 6, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.95, "static_load_kN": 0.93, "fatigue_load_limit_kN": 0.045, "reference_speed_rpm": 80000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 7.65, "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 bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). Envelope 9×20×6 mm (0.354×0.787×0.236 in), C 1.95 kN, C0 0.93 kN, Pu 0.045 kN; limiting speed 40000 r/min and mass 7.65 g. SKF spells the double shield W 619/9-2Z (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 W619-9-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 — W619-9-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W619-9-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: W619-9-ZZ is quoted at C 1.95 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 9 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 W619-9-ZZ chamfer so the 6 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 W619-9-ZZ?", "a": "SKF W 619/9-2Z measures 9×20×6 mm (0.354×0.787×0.236 in), about 7.65 g, C 1.95 kN." }, { "q": "What does the W in W 619/9-2Z 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 W619-9-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": "619-9-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×20×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.95/0.93 kN vs 2.34/0.98 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-9", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×20×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.95/0.93 kN vs 2.34/0.98 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-9", "equiv_brand": "SKF", "level": "full", "note": "Same 9×20×6 mm envelope and equivalent catalogue ratings; W 619/9 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-9-ZZ", "W 619/9-2Z" ], "locale_variants": {} }, { "sku": "W619-9", "brand": "SKF", "manufacturer_designation": "W 619/9", "series": "61900-series", "type": "deep_groove", "d_mm": 9, "D_mm": 20, "B_mm": 6, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.95, "static_load_kN": 0.93, "fatigue_load_limit_kN": 0.045, "reference_speed_rpm": 80000, "limiting_speed_rpm": 50000, "max_rpm": 50000, "weight_g": 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 61900-series, the bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). Envelope 9×20×6 mm (0.354×0.787×0.236 in), C 1.95 kN, C0 0.93 kN, Pu 0.045 kN; limiting speed 50000 r/min and mass 7 g. The open W 619/9 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 — W619-9 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W619-9 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: W619-9 is quoted at C 1.95 kN versus the 6 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 W619-9; standard fill is industrial grease unless specified otherwise.", "Deep-groove geometry tolerates only minutes of misalignment; if the 20 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W619-9.", "The fatigue load limit is 0.045 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 W619-9?", "a": "SKF W 619/9 measures 9×20×6 mm (0.354×0.787×0.236 in), about 7 g, C 1.95 kN." }, { "q": "What does the W in W 619/9 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 W619-9 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 W619-9?", "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": "619-9-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×20×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.95/0.93 kN vs 2.34/0.98 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "619-9", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×20×6 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.95/0.93 kN vs 2.34/0.98 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W619-9-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×20×6 mm envelope and equivalent catalogue ratings; W 619/9-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W619-9", "W 619/9" ], "locale_variants": {} }, { "sku": "W609-2RS", "brand": "SKF", "manufacturer_designation": "W 609-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 9, "D_mm": 24, "B_mm": 7, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 0.815, "fatigue_load_limit_kN": 0.036, "limiting_speed_rpm": 20000, "max_rpm": 20000, "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 6000-series, the final digit is the bore in millimetres: 609 fits a 9 mm shaft (direct-number miniature spelling). Envelope 9×24×7 mm (0.354×0.945×0.276 in), C 2.03 kN, C0 0.815 kN, Pu 0.036 kN; limiting speed 20000 r/min and mass 14 g. SKF catalogues the sealed execution as W 609-2RS1: 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 W609-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W609-2RS 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 W609-2RS 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 — W609-2RS is not marine-grade stainless.", "Assign interference to the rotating ring: on a conventional shaft-mounted 9 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 0.036 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 W609-2RS?", "a": "SKF W 609-2RS1 measures 9×24×7 mm (0.354×0.945×0.276 in), about 14 g, C 2.03 kN." }, { "q": "What does the W in W 609-2RS1 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 W609-2RS 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": "609", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "609-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "609-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "609-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; W 609-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W609", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; W 609 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W609-2RS", "W 609-2RS1" ], "locale_variants": {} }, { "sku": "W609-ZZ", "brand": "SKF", "manufacturer_designation": "W 609-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 9, "D_mm": 24, "B_mm": 7, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 0.815, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "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 6000-series, the final digit is the bore in millimetres: 609 fits a 9 mm shaft (direct-number miniature spelling). Envelope 9×24×7 mm (0.354×0.945×0.276 in), C 2.03 kN, C0 0.815 kN, Pu 0.036 kN; limiting speed 36000 r/min and mass 14 g. SKF spells the double shield W 609-2Z (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 — W609-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W609-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: W609-ZZ is quoted at C 2.03 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 W609-ZZ; standard fill is industrial grease unless specified otherwise.", "The fatigue load limit is 0.036 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 24 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W609-ZZ." ], "faq": [ { "q": "What are the dimensions of the stainless W609-ZZ?", "a": "SKF W 609-2Z measures 9×24×7 mm (0.354×0.945×0.276 in), about 14 g, C 2.03 kN." }, { "q": "What does the W in W 609-2Z 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 W609-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 W609-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "609", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "609-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "609-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "609-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; W 609-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W609", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; W 609 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W609-ZZ", "W 609-2Z" ], "locale_variants": {} }, { "sku": "W609", "brand": "SKF", "manufacturer_designation": "W 609", "series": "6000-series", "type": "deep_groove", "d_mm": 9, "D_mm": 24, "B_mm": 7, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 0.815, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 70000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 13, "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 final digit is the bore in millimetres: 609 fits a 9 mm shaft (direct-number miniature spelling). Envelope 9×24×7 mm (0.354×0.945×0.276 in), C 2.03 kN, C0 0.815 kN, Pu 0.036 kN; limiting speed 43000 r/min and mass 13 g. The open W 609 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 W609; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W609 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 W609 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 — W609 is not marine-grade stainless.", "Catalogue ratings for W609 (C 2.03 kN, C0 0.815 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 9 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 W609?", "a": "SKF W 609 measures 9×24×7 mm (0.354×0.945×0.276 in), about 13 g, C 2.03 kN." }, { "q": "What does the W in W 609 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 W609 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": "609", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "609-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "609-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "609-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×24×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (2.03/0.815 kN vs 3.9/1.66 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W609-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; W 609-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W609-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×24×7 mm envelope and equivalent catalogue ratings; W 609-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W609", "W 609" ], "locale_variants": {} }, { "sku": "W629-2RS", "brand": "SKF", "manufacturer_designation": "W 629-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 9, "D_mm": 26, "B_mm": 8, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.97, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 19, "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 final digit is the bore in millimetres: 629 fits a 9 mm shaft (direct-number miniature spelling). Envelope 9×26×8 mm (0.354×1.024×0.315 in), C 3.97 kN, C0 1.96 kN, Pu 0.083 kN; limiting speed 19000 r/min and mass 19 g. SKF catalogues the sealed execution as W 629-2RS1: 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 W629-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W629-2RS 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 W629-2RS 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 — W629-2RS is not marine-grade stainless.", "Catalogue ratings for W629-2RS (C 3.97 kN, C0 1.96 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.", "Do not preload W629-2RS 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 W629-2RS?", "a": "SKF W 629-2RS1 measures 9×26×8 mm (0.354×1.024×0.315 in), about 19 g, C 3.97 kN." }, { "q": "What does the W in W 629-2RS1 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 W629-2RS?", "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 W629-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "629", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "629-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "629-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "629-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W629-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; W 629-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W629-2RS", "W 629-2RS1" ], "locale_variants": {} }, { "sku": "W629-ZZ", "brand": "SKF", "manufacturer_designation": "W 629-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 9, "D_mm": 26, "B_mm": 8, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.97, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 19, "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 final digit is the bore in millimetres: 629 fits a 9 mm shaft (direct-number miniature spelling). Envelope 9×26×8 mm (0.354×1.024×0.315 in), C 3.97 kN, C0 1.96 kN, Pu 0.083 kN; limiting speed 32000 r/min and mass 19 g. SKF spells the double shield W 629-2Z (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: W629-ZZ is quoted at C 3.97 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 W629-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W629-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 W629-ZZ inside the quoted grease temperature range.", "Assign interference to the rotating ring: on a conventional shaft-mounted 9 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 W629-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W629-ZZ?", "a": "SKF W 629-2Z measures 9×26×8 mm (0.354×1.024×0.315 in), about 19 g, C 3.97 kN." }, { "q": "What does the W in W 629-2Z 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 W629-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 W629-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": "629", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "629-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "629-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "629-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty." }, { "equiv_sku": "W629-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 9×26×8 mm envelope and equivalent catalogue ratings; W 629-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." } ], "source_ref": "https://cdn.skfmediahub.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": [ "W629-ZZ", "W 629-2Z" ], "locale_variants": {} }, { "sku": "W61800-2RS", "brand": "SKF", "manufacturer_designation": "W 61800-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.48, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 5.2, "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 00 follows the 10/12/15/17 mm exception table, so 61800 fits a 10 mm shaft. Envelope 10×19×5 mm (0.394×0.748×0.197 in), C 1.48 kN, C0 0.83 kN, Pu 0.036 kN; limiting speed 22000 r/min and mass 5.2 g. SKF catalogues the sealed execution as W 61800-2RS1: 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 W61800-2RS 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: W61800-2RS is quoted at C 1.48 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 W61800-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61800-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Do not preload W61800-2RS 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 10 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 W61800-2RS?", "a": "SKF W 61800-2RS1 measures 10×19×5 mm (0.394×0.748×0.197 in), about 5.2 g, C 1.48 kN." }, { "q": "What does the W in W 61800-2RS1 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 W61800-2RS 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 W61800-2RS?", "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": "W61800-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×19×5 mm envelope and equivalent catalogue ratings; W 61800-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "full", "note": "Same 10×19×5 mm envelope and equivalent catalogue ratings; W 61800 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61800", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.83 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61800-2RS1 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.83 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61800-2Z shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.83 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61800-2RSR shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61800-2Z shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800DD shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800VV shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800ZZ shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800LLU shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800LLB shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800ZZ shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 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": [ "W61800-2RS", "W 61800-2RS1" ], "locale_variants": {} }, { "sku": "W61800-ZZ", "brand": "SKF", "manufacturer_designation": "W 61800-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.48, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 5.1, "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 00 follows the 10/12/15/17 mm exception table, so 61800 fits a 10 mm shaft. Envelope 10×19×5 mm (0.394×0.748×0.197 in), C 1.48 kN, C0 0.83 kN, Pu 0.036 kN; limiting speed 38000 r/min and mass 5.1 g. SKF spells the double shield W 61800-2Z (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 — W61800-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61800-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: W61800-ZZ is quoted at C 1.48 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 W61800-ZZ; standard fill is industrial grease unless specified otherwise.", "Catalogue ratings for W61800-ZZ (C 1.48 kN, C0 0.83 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 W61800-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 W61800-ZZ?", "a": "SKF W 61800-2Z measures 10×19×5 mm (0.394×0.748×0.197 in), about 5.1 g, C 1.48 kN." }, { "q": "What does the W in W 61800-2Z 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 W61800-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 W61800-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×19×5 mm envelope and equivalent catalogue ratings; W 61800-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "full", "note": "Same 10×19×5 mm envelope and equivalent catalogue ratings; W 61800 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61800", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.83 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61800-2RS1 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.83 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61800-2Z shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.83 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61800-2RSR shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61800-2Z shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800DD shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800VV shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800ZZ shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800LLU shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800LLB shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800ZZ shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 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": [ "W61800-ZZ", "W 61800-2Z" ], "locale_variants": {} }, { "sku": "W61800", "brand": "SKF", "manufacturer_designation": "W 61800", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.48, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 48000, "max_rpm": 48000, "weight_g": 4.8, "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 00 follows the 10/12/15/17 mm exception table, so 61800 fits a 10 mm shaft. Envelope 10×19×5 mm (0.394×0.748×0.197 in), C 1.48 kN, C0 0.83 kN, Pu 0.036 kN; limiting speed 48000 r/min and mass 4.8 g. The open W 61800 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 W61800 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 — W61800 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61800 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: W61800 is quoted at C 1.48 kN versus the 5 mm-wide 52100 version — do not swap on dimensions alone.", "The fatigue load limit is 0.036 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 19 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61800." ], "faq": [ { "q": "What are the dimensions of the stainless W61800?", "a": "SKF W 61800 measures 10×19×5 mm (0.394×0.748×0.197 in), about 4.8 g, C 1.48 kN." }, { "q": "What does the W in W 61800 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 W61800 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": "W61800-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×19×5 mm envelope and equivalent catalogue ratings; W 61800-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×19×5 mm envelope and equivalent catalogue ratings; W 61800-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61800", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.83 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61800-2RS1 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.83 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61800-2Z shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.83 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61800-2RSR shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61800-2Z shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.72/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800DD shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800VV shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800ZZ shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 1.89/0.84 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800 shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800LLU shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800LLB shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6800ZZ shares the 10×19×5 mm envelope but carries different catalogue ratings (1.48/0.83 kN vs 2.03/0.93 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": [ "W61800", "W 61800" ], "locale_variants": {} }, { "sku": "W63800-ZZ", "brand": "SKF", "manufacturer_designation": "W 63800-2Z", "series": "63800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 7, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.48, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "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 63800-series, bore code 00 follows the 10/12/15/17 mm exception table, so 63800 fits a 10 mm shaft. Envelope 10×19×7 mm (0.394×0.748×0.276 in), C 1.48 kN, C0 0.83 kN, Pu 0.036 kN; limiting speed 38000 r/min and mass 7.1 g. SKF spells the double shield W 63800-2Z (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 — W63800-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W63800-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: W63800-ZZ is quoted at C 1.48 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 W63800-ZZ; standard fill is industrial grease unless specified otherwise.", "Do not preload W63800-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.", "Mount by heating the inner ring (max 120 °C) — driving W63800-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W63800-ZZ?", "a": "SKF W 63800-2Z measures 10×19×7 mm (0.394×0.748×0.276 in), about 7.1 g, C 1.48 kN." }, { "q": "What does the W in W 63800-2Z 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 W63800-ZZ?", "a": "The envelope matches, but stainless rates lower (C 1.48 kN for W 63800-2Z); 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": [], "source_ref": "https://cdn.skfmediahub.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": [ "W63800-ZZ", "W 63800-2Z" ], "locale_variants": {} }, { "sku": "W61900-2RS", "brand": "SKF", "manufacturer_designation": "W 61900-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 1.25, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 9.3, "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 00 follows the 10/12/15/17 mm exception table, so 61900 fits a 10 mm shaft. Envelope 10×22×6 mm (0.394×0.866×0.236 in), C 2.34 kN, C0 1.25 kN, Pu 0.054 kN; limiting speed 20000 r/min and mass 9.3 g. SKF catalogues the sealed execution as W 61900-2RS1: 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 W61900-2RS 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 W61900-2RS 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 — W61900-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61900-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "At 10 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 10 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 W61900-2RS?", "a": "SKF W 61900-2RS1 measures 10×22×6 mm (0.394×0.866×0.236 in), about 9.3 g, C 2.34 kN." }, { "q": "What does the W in W 61900-2RS1 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 W61900-2RS?", "a": "The envelope matches, but stainless rates lower (C 2.34 kN for W 61900-2RS1); 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": "W61900-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×22×6 mm envelope and equivalent catalogue ratings; W 61900-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "full", "note": "Same 10×22×6 mm envelope and equivalent catalogue ratings; W 61900 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61900", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61900-2RS1 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61900-2Z shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61900-2RSR shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61900-2Z shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.02 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900DD shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900VV shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900ZZ shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900LLU shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900LLB shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900ZZ shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 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": [ "W61900-2RS", "W 61900-2RS1" ], "locale_variants": {} }, { "sku": "W61900-ZZ", "brand": "SKF", "manufacturer_designation": "W 61900-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 1.25, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 9.4, "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 00 follows the 10/12/15/17 mm exception table, so 61900 fits a 10 mm shaft. Envelope 10×22×6 mm (0.394×0.866×0.236 in), C 2.34 kN, C0 1.25 kN, Pu 0.054 kN; limiting speed 36000 r/min and mass 9.4 g. SKF spells the double shield W 61900-2Z (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": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61900-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61900-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 W61900-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 — W61900-ZZ is not marine-grade stainless.", "Do not preload W61900-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 W61900-ZZ (C 2.34 kN, C0 1.25 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 W61900-ZZ?", "a": "SKF W 61900-2Z measures 10×22×6 mm (0.394×0.866×0.236 in), about 9.4 g, C 2.34 kN." }, { "q": "What does the W in W 61900-2Z 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 W61900-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 W61900-ZZ; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×22×6 mm envelope and equivalent catalogue ratings; W 61900-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "full", "note": "Same 10×22×6 mm envelope and equivalent catalogue ratings; W 61900 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61900", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61900-2RS1 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61900-2Z shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61900-2RSR shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61900-2Z shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.02 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900DD shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900VV shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900ZZ shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900LLU shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900LLB shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900ZZ shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 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": [ "W61900-ZZ", "W 61900-2Z" ], "locale_variants": {} }, { "sku": "W61900", "brand": "SKF", "manufacturer_designation": "W 61900", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.34, "static_load_kN": 1.25, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 8.7, "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 61900-series, bore code 00 follows the 10/12/15/17 mm exception table, so 61900 fits a 10 mm shaft. Envelope 10×22×6 mm (0.394×0.866×0.236 in), C 2.34 kN, C0 1.25 kN, Pu 0.054 kN; limiting speed 45000 r/min and mass 8.7 g. The open W 61900 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 — W61900 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61900 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: W61900 is quoted at C 2.34 kN versus the 6 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 W61900; standard fill is industrial grease unless specified otherwise.", "Fillet radii must clear the W61900 chamfer so the 6 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "Catalogue ratings for W61900 (C 2.34 kN, C0 1.25 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 W61900?", "a": "SKF W 61900 measures 10×22×6 mm (0.394×0.866×0.236 in), about 8.7 g, C 2.34 kN." }, { "q": "What does the W in W 61900 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 W61900 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": "W61900-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×22×6 mm envelope and equivalent catalogue ratings; W 61900-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×22×6 mm envelope and equivalent catalogue ratings; W 61900-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61900", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61900-2RS1 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61900-2Z shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61900-2RSR shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61900-2Z shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.7/1.02 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900DD shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900VV shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900ZZ shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.97/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900 shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900LLU shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900LLB shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6900ZZ shares the 10×22×6 mm envelope but carries different catalogue ratings (2.34/1.25 kN vs 2.99/1.27 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": [ "W61900", "W 61900" ], "locale_variants": {} }, { "sku": "W6000-2RS", "brand": "SKF", "manufacturer_designation": "W 6000-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.97, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "limiting_speed_rpm": 19000, "max_rpm": 19000, "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 00 follows the 10/12/15/17 mm exception table, so 6000 fits a 10 mm shaft. Envelope 10×26×8 mm (0.394×1.024×0.315 in), C 3.97 kN, C0 1.96 kN, Pu 0.083 kN; limiting speed 19000 r/min and mass 18 g. SKF catalogues the sealed execution as W 6000-2RS1: 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 — W6000-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6000-2RS 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: W6000-2RS is quoted at C 3.97 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 W6000-2RS; standard fill is industrial grease unless specified otherwise.", "Assign interference to the rotating ring: on a conventional shaft-mounted 10 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 10 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 W6000-2RS?", "a": "SKF W 6000-2RS1 measures 10×26×8 mm (0.394×1.024×0.315 in), about 18 g, C 3.97 kN." }, { "q": "What does the W in W 6000-2RS1 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 W6000-2RS?", "a": "The envelope matches, but stainless rates lower (C 3.97 kN for W 6000-2RS1); 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": "W6000-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×26×8 mm envelope and equivalent catalogue ratings; W 6000-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "full", "note": "Same 10×26×8 mm envelope and equivalent catalogue ratings; W 6000 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000 shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000-2RSH shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000-2RSL shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000-2Z shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6000-C shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.3/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6000-C-2HRS shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.3/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6000-C-2Z shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.3/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000DDU shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000VV shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000ZZ shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000 shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 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": [ "W6000-2RS", "W 6000-2RS1" ], "locale_variants": {} }, { "sku": "W6000-ZZ", "brand": "SKF", "manufacturer_designation": "W 6000-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.97, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "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 00 follows the 10/12/15/17 mm exception table, so 6000 fits a 10 mm shaft. Envelope 10×26×8 mm (0.394×1.024×0.315 in), C 3.97 kN, C0 1.96 kN, Pu 0.083 kN; limiting speed 32000 r/min and mass 18 g. SKF spells the double shield W 6000-2Z (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 W6000-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6000-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 W6000-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 — W6000-ZZ is not marine-grade stainless.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 6000-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "Deep-groove geometry tolerates only minutes of misalignment; if the 26 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6000-ZZ." ], "faq": [ { "q": "What are the dimensions of the stainless W6000-ZZ?", "a": "SKF W 6000-2Z measures 10×26×8 mm (0.394×1.024×0.315 in), about 18 g, C 3.97 kN." }, { "q": "What does the W in W 6000-2Z 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 W6000-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 W6000-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": "W6000-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×26×8 mm envelope and equivalent catalogue ratings; W 6000-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "full", "note": "Same 10×26×8 mm envelope and equivalent catalogue ratings; W 6000 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000 shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000-2RSH shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000-2RSL shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000-2Z shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6000-C shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.3/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6000-C-2HRS shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.3/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6000-C-2Z shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.3/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000DDU shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000VV shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000ZZ shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000 shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 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": [ "W6000-ZZ", "W 6000-2Z" ], "locale_variants": {} }, { "sku": "W6000", "brand": "SKF", "manufacturer_designation": "W 6000", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3.97, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "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 6000-series, bore code 00 follows the 10/12/15/17 mm exception table, so 6000 fits a 10 mm shaft. Envelope 10×26×8 mm (0.394×1.024×0.315 in), C 3.97 kN, C0 1.96 kN, Pu 0.083 kN; limiting speed 40000 r/min and mass 17 g. The open W 6000 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: W6000 is quoted at C 3.97 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 W6000; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6000 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 W6000 inside the quoted grease temperature range.", "Mount by heating the inner ring (max 120 °C) — driving W6000 home through the outer ring or balls brinells the raceways.", "Fillet radii must clear the W6000 chamfer so the 8 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 W6000?", "a": "SKF W 6000 measures 10×26×8 mm (0.394×1.024×0.315 in), about 17 g, C 3.97 kN." }, { "q": "What does the W in W 6000 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 W6000 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 W6000?", "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": "W6000-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×26×8 mm envelope and equivalent catalogue ratings; W 6000-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×26×8 mm envelope and equivalent catalogue ratings; W 6000-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000 shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000-2RSH shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000-2RSL shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6000-2Z shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 4.75/1.96 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6000-C shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.3/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6000-C-2HRS shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.3/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6000-C-2Z shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.3/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000DDU shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000VV shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000ZZ shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6000 shares the 10×26×8 mm envelope but carries different catalogue ratings (3.97/1.96 kN vs 5.05/1.97 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": [ "W6000", "W 6000" ], "locale_variants": {} }, { "sku": "W6200-2RS", "brand": "SKF", "manufacturer_designation": "W 6200-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 16000, "max_rpm": 16000, "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 6200-series, bore code 00 follows the 10/12/15/17 mm exception table, so 6200 fits a 10 mm shaft. Envelope 10×30×9 mm (0.394×1.181×0.354 in), C 4.36 kN, C0 2.32 kN, Pu 0.1 kN; limiting speed 16000 r/min and mass 30 g. SKF catalogues the sealed execution as W 6200-2RS1: 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 — W6200-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6200-2RS 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: W6200-2RS is quoted at C 4.36 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 W6200-2RS; standard fill is industrial grease unless specified otherwise.", "Fillet radii must clear the W6200-2RS chamfer so the 9 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 30 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W6200-2RS." ], "faq": [ { "q": "What are the dimensions of the stainless W6200-2RS?", "a": "SKF W 6200-2RS1 measures 10×30×9 mm (0.394×1.181×0.354 in), about 30 g, C 4.36 kN." }, { "q": "What does the W in W 6200-2RS1 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 W6200-2RS?", "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 W6200-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×30×9 mm envelope and equivalent catalogue ratings; W 6200-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "full", "note": "Same 10×30×9 mm envelope and equivalent catalogue ratings; W 6200 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200 shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200-2Z shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200-2RSH shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200-2RSL shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6200-C shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 7/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6200-C-2HRS shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 7/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6200-C-2Z shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 7/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200DDU shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200VV shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200ZZ shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200 shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200 shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200LLU shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200LLB shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200ZZ shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 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": [ "W6200-2RS", "W 6200-2RS1" ], "locale_variants": {} }, { "sku": "W6200-ZZ", "brand": "SKF", "manufacturer_designation": "W 6200-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "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 6200-series, bore code 00 follows the 10/12/15/17 mm exception table, so 6200 fits a 10 mm shaft. Envelope 10×30×9 mm (0.394×1.181×0.354 in), C 4.36 kN, C0 2.32 kN, Pu 0.1 kN; limiting speed 30000 r/min and mass 30 g. SKF spells the double shield W 6200-2Z (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 W6200-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: W6200-ZZ is quoted at C 4.36 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 W6200-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6200-ZZ or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Fillet radii must clear the W6200-ZZ chamfer so the 9 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.", "The fatigue load limit is 0.1 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 W6200-ZZ?", "a": "SKF W 6200-2Z measures 10×30×9 mm (0.394×1.181×0.354 in), about 30 g, C 4.36 kN." }, { "q": "What does the W in W 6200-2Z 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 W6200-ZZ; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6200-ZZ?", "a": "The envelope matches, but stainless rates lower (C 4.36 kN for W 6200-2Z); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×30×9 mm envelope and equivalent catalogue ratings; W 6200-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "full", "note": "Same 10×30×9 mm envelope and equivalent catalogue ratings; W 6200 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200 shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200-2Z shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200-2RSH shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200-2RSL shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6200-C shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 7/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6200-C-2HRS shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 7/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6200-C-2Z shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 7/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200DDU shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200VV shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200ZZ shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200 shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200 shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200LLU shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200LLB shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200ZZ shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 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": [ "W6200-ZZ", "W 6200-2Z" ], "locale_variants": {} }, { "sku": "W6200", "brand": "SKF", "manufacturer_designation": "W 6200", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "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 6200-series, bore code 00 follows the 10/12/15/17 mm exception table, so 6200 fits a 10 mm shaft. Envelope 10×30×9 mm (0.394×1.181×0.354 in), C 4.36 kN, C0 2.32 kN, Pu 0.1 kN; limiting speed 36000 r/min and mass 28 g. The open W 6200 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 — W6200 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6200 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: W6200 is quoted at C 4.36 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 W6200; standard fill is industrial grease unless specified otherwise.", "The fatigue load limit is 0.1 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.", "Catalogue ratings for W6200 (C 4.36 kN, C0 2.32 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 W6200?", "a": "SKF W 6200 measures 10×30×9 mm (0.394×1.181×0.354 in), about 28 g, C 4.36 kN." }, { "q": "What does the W in W 6200 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 W6200?", "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 W6200; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×30×9 mm envelope and equivalent catalogue ratings; W 6200-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×30×9 mm envelope and equivalent catalogue ratings; W 6200-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200 shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200-2Z shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200-2RSH shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6200-2RSL shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.4/2.36 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6200-C shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 7/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6200-C-2HRS shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 7/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6200-C-2Z shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 7/2.6 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200DDU shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200VV shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200ZZ shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6200 shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.6/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200 shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200LLU shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200LLB shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 kN vs 5.65/2.39 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6200ZZ shares the 10×30×9 mm envelope but carries different catalogue ratings (4.36/2.32 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": [ "W6200", "W 6200" ], "locale_variants": {} }, { "sku": "W6300-2RS", "brand": "SKF", "manufacturer_designation": "W 6300-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.02, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.146, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 52, "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 00 follows the 10/12/15/17 mm exception table, so 6300 fits a 10 mm shaft. Envelope 10×35×11 mm (0.394×1.378×0.433 in), C 7.02 kN, C0 3.4 kN, Pu 0.146 kN; limiting speed 15000 r/min and mass 52 g. SKF catalogues the sealed execution as W 6300-2RS1: 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 W6300-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W6300-2RS 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 W6300-2RS 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 — W6300-2RS is not marine-grade stainless.", "Assign interference to the rotating ring: on a conventional shaft-mounted 10 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 10 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 W6300-2RS?", "a": "SKF W 6300-2RS1 measures 10×35×11 mm (0.394×1.378×0.433 in), about 52 g, C 7.02 kN." }, { "q": "What does the W in W 6300-2RS1 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 W6300-2RS 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": "W6300-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×35×11 mm envelope and equivalent catalogue ratings; W 6300-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "full", "note": "Same 10×35×11 mm envelope and equivalent catalogue ratings; W 6300 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300-2Z shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300-2RSH shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300-2RSL shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.6/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6300-2RSR shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.6/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6300-2Z shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.6/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300DDU shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300VV shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300ZZ shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300LLU shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300LLB shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300ZZ shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 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": [ "W6300-2RS", "W 6300-2RS1" ], "locale_variants": {} }, { "sku": "W6300-ZZ", "brand": "SKF", "manufacturer_designation": "W 6300-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.02, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 53000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 53, "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 00 follows the 10/12/15/17 mm exception table, so 6300 fits a 10 mm shaft. Envelope 10×35×11 mm (0.394×1.378×0.433 in), C 7.02 kN, C0 3.4 kN, Pu 0.146 kN; limiting speed 26000 r/min and mass 53 g. SKF spells the double shield W 6300-2Z (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 — W6300-ZZ is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6300-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: W6300-ZZ is quoted at C 7.02 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 W6300-ZZ; standard fill is industrial grease unless specified otherwise.", "Fillet radii must clear the W6300-ZZ chamfer so the 11 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 W6300-ZZ home through the outer ring or balls brinells the raceways." ], "faq": [ { "q": "What are the dimensions of the stainless W6300-ZZ?", "a": "SKF W 6300-2Z measures 10×35×11 mm (0.394×1.378×0.433 in), about 53 g, C 7.02 kN." }, { "q": "What does the W in W 6300-2Z 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 W6300-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 W6300-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": "W6300-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×35×11 mm envelope and equivalent catalogue ratings; W 6300-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "full", "note": "Same 10×35×11 mm envelope and equivalent catalogue ratings; W 6300 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300-2Z shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300-2RSH shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300-2RSL shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.6/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6300-2RSR shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.6/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6300-2Z shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.6/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300DDU shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300VV shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300ZZ shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300LLU shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300LLB shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300ZZ shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 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": [ "W6300-ZZ", "W 6300-2Z" ], "locale_variants": {} }, { "sku": "W6300", "brand": "SKF", "manufacturer_designation": "W 6300", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "SS440C", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.02, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 53000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 50, "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 00 follows the 10/12/15/17 mm exception table, so 6300 fits a 10 mm shaft. Envelope 10×35×11 mm (0.394×1.378×0.433 in), C 7.02 kN, C0 3.4 kN, Pu 0.146 kN; limiting speed 34000 r/min and mass 50 g. The open W 6300 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 W6300 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 — W6300 is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W6300 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: W6300 is quoted at C 7.02 kN versus the 11 mm-wide 52100 version — do not swap on dimensions alone.", "Mount by heating the inner ring (max 120 °C) — driving W6300 home through the outer ring or balls brinells the raceways.", "At 10 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 W6300?", "a": "SKF W 6300 measures 10×35×11 mm (0.394×1.378×0.433 in), about 50 g, C 7.02 kN." }, { "q": "What does the W in W 6300 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 W6300; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W6300?", "a": "The envelope matches, but stainless rates lower (C 7.02 kN for W 6300); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×35×11 mm envelope and equivalent catalogue ratings; W 6300-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×35×11 mm envelope and equivalent catalogue ratings; W 6300-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300-2Z shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300-2RSH shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-RSR", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 6300-2RSL shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.52/3.4 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.6/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6300-2RSR shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.6/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 6300-2Z shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.6/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300DDU shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300VV shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300ZZ shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 8.9/3.45 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300 shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300LLU shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300LLB shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6300ZZ shares the 10×35×11 mm envelope but carries different catalogue ratings (7.02/3.4 kN vs 9.1/3.5 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": [ "W6300", "W 6300" ], "locale_variants": {} }, { "sku": "W61801-2RS", "brand": "SKF", "manufacturer_designation": "W 61801-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "SS440C", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.51, "static_load_kN": 0.9, "fatigue_load_limit_kN": 0.039, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 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 01 follows the 10/12/15/17 mm exception table, so 61801 fits a 12 mm shaft. Envelope 12×21×5 mm (0.472×0.827×0.197 in), C 1.51 kN, C0 0.9 kN, Pu 0.039 kN; limiting speed 20000 r/min and mass 6 g. SKF catalogues the sealed execution as W 61801-2RS1: 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 W61801-2RS 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 W61801-2RS 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 — W61801-2RS is not marine-grade stainless.", "The stainless steel is martensitic and MAGNETIC; do not reject W61801-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.", "The fatigue load limit is 0.039 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 21 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61801-2RS." ], "faq": [ { "q": "What are the dimensions of the stainless W61801-2RS?", "a": "SKF W 61801-2RS1 measures 12×21×5 mm (0.472×0.827×0.197 in), about 6 g, C 1.51 kN." }, { "q": "What does the W in W 61801-2RS1 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 W61801-2RS?", "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 W61801-2RS; add seals and food-grade grease for wet positions." } ], "cross_ref": [ { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×21×5 mm envelope and equivalent catalogue ratings; W 61801-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61801", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61801 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.74/0.915 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61801-2RS1 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.74/0.915 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61801-2Z shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.74/0.915 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61801 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.92/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61801-2RSR shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.92/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61801-2Z shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.92/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6801DD shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.11/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6801VV shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.11/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6801ZZ shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.11/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6801 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.11/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6801 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.12/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6801LLU shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.12/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6801LLB shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.12/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6801ZZ shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.12/1.04 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": [ "W61801-2RS", "W 61801-2RS1" ], "locale_variants": {} }, { "sku": "W61801-ZZ", "brand": "SKF", "manufacturer_designation": "W 61801-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "SS440C", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.51, "static_load_kN": 0.9, "fatigue_load_limit_kN": 0.039, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 5.7, "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 01 follows the 10/12/15/17 mm exception table, so 61801 fits a 12 mm shaft. Envelope 12×21×5 mm (0.472×0.827×0.197 in), C 1.51 kN, C0 0.9 kN, Pu 0.039 kN; limiting speed 36000 r/min and mass 5.7 g. SKF spells the double shield W 61801-2Z (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": [ "Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61801-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61801-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 W61801-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 — W61801-ZZ is not marine-grade stainless.", "Deep-groove geometry tolerates only minutes of misalignment; if the 21 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61801-ZZ.", "Catalogue ratings for W61801-ZZ (C 1.51 kN, C0 0.9 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." ], "faq": [ { "q": "What are the dimensions of the stainless W61801-ZZ?", "a": "SKF W 61801-2Z measures 12×21×5 mm (0.472×0.827×0.197 in), about 5.7 g, C 1.51 kN." }, { "q": "What does the W in W 61801-2Z 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 W61801-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 W61801-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": "W61801-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×21×5 mm envelope and equivalent catalogue ratings; W 61801-2RS1 is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs." }, { "equiv_sku": "61801", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61801 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.74/0.915 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61801-2RS1 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.74/0.915 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF SKF 61801-2Z shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.74/0.915 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61801 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.92/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61801-2RSR shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.92/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "FAG FAG 61801-2Z shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 1.92/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6801DD shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.11/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6801VV shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.11/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6801ZZ shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.11/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "NSK NSK 6801 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.11/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6801 shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.12/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6801LLU shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.12/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6801LLB shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.12/1.04 kN) — the stainless execution is not a load-rating equivalent." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "NTN 6801ZZ shares the 12×21×5 mm envelope but carries different catalogue ratings (1.51/0.9 kN vs 2.12/1.04 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": [ "W61801-ZZ", "W 61801-2Z" ], "locale_variants": {} }, { "sku": "W61901-2RS", "brand": "SKF", "manufacturer_designation": "W 61901-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "SS440C", "seal_type": "2RS", "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, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 10, "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 19000 r/min and mass 10 g. SKF catalogues the sealed execution as W 61901-2RS1: 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 W61901-2RS 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: W61901-2RS is quoted at C 2.51 kN versus the 6 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 W61901-2RS; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61901-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.", "Deep-groove geometry tolerates only minutes of misalignment; if the 24 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61901-2RS.", "Fillet radii must clear the W61901-2RS chamfer so the 6 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 W61901-2RS?", "a": "SKF W 61901-2RS1 measures 12×24×6 mm (0.472×0.945×0.236 in), about 10 g, C 2.51 kN." }, { "q": "What does the W in W 61901-2RS1 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 W61901-2RS; add seals and food-grade grease for wet positions." }, { "q": "Can I replace a chrome-steel bearing with stainless W61901-2RS?", "a": "The envelope matches, but stainless rates lower (C 2.51 kN for W 61901-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life." } ], "cross_ref": [ { "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": "W61901", "equiv_brand": "SKF", "level": "full", "note": "Same 12×24×6 mm envelope and equivalent catalogue ratings; W 61901 is the open arrangement 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": [ "W61901-2RS", "W 61901-2RS1" ], "locale_variants": {} }, { "sku": "W61901-ZZ", "brand": "SKF", "manufacturer_designation": "W 61901-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "SS440C", "seal_type": "ZZ", "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": 32000, "max_rpm": 32000, "weight_g": 11, "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 32000 r/min and mass 11 g. SKF spells the double shield W 61901-2Z (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: W61901-ZZ is quoted at C 2.51 kN versus the 6 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 W61901-ZZ; standard fill is industrial grease unless specified otherwise.", "Corrosion resistance depends on clean, undamaged surfaces: never weld near W61901-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 W61901-ZZ inside the quoted grease temperature range.", "Clearance suffixes follow the seal code in the designation stack (e.g. W 61901-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.", "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." ], "faq": [ { "q": "What are the dimensions of the stainless W61901-ZZ?", "a": "SKF W 61901-2Z measures 12×24×6 mm (0.472×0.945×0.236 in), about 11 g, C 2.51 kN." }, { "q": "What does the W in W 61901-2Z 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 W61901-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": "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", "equiv_brand": "SKF", "level": "full", "note": "Same 12×24×6 mm envelope and equivalent catalogue ratings; W 61901 is the open arrangement 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-ZZ", "W 61901-2Z" ], "locale_variants": {} }, { "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": {} } ]