[ { "sku": "16002", "brand": "FAG", "manufacturer_designation": "FAG 16002", "series": "16000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.59, "static_load_kN": 2.84, "limiting_speed_rpm": 33500, "reference_speed_rpm": 20000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16002.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 16002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 160xx narrow section at 15 mm bore shares the 32 mm outside diameter of the 6002 but is only 8 mm wide; a 6002 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16002 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×32×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16002 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16002 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16002 bearing?", "a": "A 16002 deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 8 mm width (0.591 × 1.26 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 16002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 16002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 16002 mean?", "a": "A bare 16002 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 15 mm bore?", "a": "160 is the narrow extra-light section: 32×8 mm with an 8.5 mm radial section at 15 mm bore. It has the same bore and outside diameter as the 6002 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16002?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16002 — the open (unsealed) execution, 15×32×8 mm per ISO 15. Quoted values: C 5.59 kN, C0 2.84 kN, mass 25 g. Limiting speed 33500 rpm, reference speed 20000 rpm. The industry-neutral page spelling 16002 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16002", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16003", "brand": "FAG", "manufacturer_designation": "FAG 16003", "series": "16000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6, "static_load_kN": 3.25, "limiting_speed_rpm": 31000, "reference_speed_rpm": 17700, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16003.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 16003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 160xx narrow section at 17 mm bore shares the 35 mm outside diameter of the 6003 but is only 8 mm wide; a 6003 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16003 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×35×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16003 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16003.", "The open 16003 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16003 bearing?", "a": "A 16003 deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 8 mm width (0.669 × 1.378 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 16003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 16003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 16003 mean?", "a": "A bare 16003 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 17 mm bore?", "a": "160 is the narrow extra-light section: 35×8 mm with a 9.0 mm radial section at 17 mm bore. It has the same bore and outside diameter as the 6003 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16003?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16003 — the open (unsealed) execution, 17×35×8 mm per ISO 15. Quoted values: C 6 kN, C0 3.25 kN, mass 32 g. Limiting speed 31000 rpm, reference speed 17700 rpm. The industry-neutral page spelling 16003 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16003", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16004", "brand": "FAG", "manufacturer_designation": "FAG 16004", "series": "16000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.91, "static_load_kN": 4.48, "limiting_speed_rpm": 26000, "reference_speed_rpm": 13800, "weight_g": 48, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16004.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16004; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 20 mm bore shares the 42 mm outside diameter of the 6004 but is only 8 mm wide; a 6004 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16004 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16004 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16004 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16004 bearing?", "a": "A 16004 deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 8 mm width (0.787 × 1.654 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16004 bore code work?", "a": "The last two digits of 16004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 8 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16004 mean?", "a": "A bare 16004 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 20 mm bore?", "a": "160 is the narrow extra-light section: 42×8 mm with an 11.0 mm radial section at 20 mm bore. It has the same bore and outside diameter as the 6004 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16004?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16004 — the open (unsealed) execution, 20×42×8 mm per ISO 15. Quoted values: C 7.91 kN, C0 4.48 kN, mass 48 g. Limiting speed 26000 rpm, reference speed 13800 rpm. The industry-neutral page spelling 16004 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16004", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16005", "brand": "FAG", "manufacturer_designation": "FAG 16005", "series": "16000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.86, "static_load_kN": 5.61, "limiting_speed_rpm": 22200, "reference_speed_rpm": 11600, "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16005.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16005; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 25 mm bore shares the 47 mm outside diameter of the 6005 but is only 8 mm wide; a 6005 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16005 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×47×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16005 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16005-C3. No clearance suffix means normal CN clearance.", "The open 16005 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16005 bearing?", "a": "A 16005 deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 8 mm width (0.984 × 1.85 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16005 bore code work?", "a": "The last two digits of 16005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 8 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16005 mean?", "a": "A bare 16005 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 25 mm bore?", "a": "160 is the narrow extra-light section: 47×8 mm with an 11.0 mm radial section at 25 mm bore. It has the same bore and outside diameter as the 6005 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16005?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16005 — the open (unsealed) execution, 25×47×8 mm per ISO 15. Quoted values: C 8.86 kN, C0 5.61 kN, mass 53 g. Limiting speed 22200 rpm, reference speed 11600 rpm. The industry-neutral page spelling 16005 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16005", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16006", "brand": "FAG", "manufacturer_designation": "FAG 16006", "series": "16000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.22, "static_load_kN": 7.39, "limiting_speed_rpm": 18500, "reference_speed_rpm": 10000, "weight_g": 82, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16006.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16006; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 30 mm bore shares the 55 mm outside diameter of the 6006 but is only 9 mm wide; a 6006 in a 9 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16006 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×55×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16006 units.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16006 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16006 bearing?", "a": "A 16006 deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 9 mm width (1.181 × 2.165 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16006 bore code work?", "a": "The last two digits of 16006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16006 mean?", "a": "A bare 16006 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 30 mm bore?", "a": "160 is the narrow extra-light section: 55×9 mm with a 12.5 mm radial section at 30 mm bore. It has the same bore and outside diameter as the 6006 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16006?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16006 — the open (unsealed) execution, 30×55×9 mm per ISO 15. Quoted values: C 11.22 kN, C0 7.39 kN, mass 82 g. Limiting speed 18500 rpm, reference speed 10000 rpm. The industry-neutral page spelling 16006 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16006", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16007", "brand": "FAG", "manufacturer_designation": "FAG 16007", "series": "16000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12.26, "static_load_kN": 8.8, "limiting_speed_rpm": 16700, "reference_speed_rpm": 8900, "weight_g": 107, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16007.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16007; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 35 mm bore shares the 62 mm outside diameter of the 6007 but is only 9 mm wide; a 6007 in a 9 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16007 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×62×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16007 units.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16007 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16007 bearing?", "a": "A 16007 deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 9 mm width (1.378 × 2.441 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16007 bore code work?", "a": "The last two digits of 16007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16007 mean?", "a": "A bare 16007 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 35 mm bore?", "a": "160 is the narrow extra-light section: 62×9 mm with a 13.5 mm radial section at 35 mm bore. It has the same bore and outside diameter as the 6007 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16007?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16007 — the open (unsealed) execution, 35×62×9 mm per ISO 15. Quoted values: C 12.26 kN, C0 8.8 kN, mass 107 g. Limiting speed 16700 rpm, reference speed 8900 rpm. The industry-neutral page spelling 16007 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16007", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16008", "brand": "FAG", "manufacturer_designation": "FAG 16008", "series": "16000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12.62, "static_load_kN": 9.65, "limiting_speed_rpm": 15200, "reference_speed_rpm": 7800, "weight_g": 127, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16008.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16008; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 40 mm bore shares the 68 mm outside diameter of the 6008 but is only 9 mm wide; a 6008 in a 9 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16008 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×68×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16008 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16008 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16008 bearing?", "a": "A 16008 deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 9 mm width (1.575 × 2.677 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16008 bore code work?", "a": "The last two digits of 16008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16008 mean?", "a": "A bare 16008 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 40 mm bore?", "a": "160 is the narrow extra-light section: 68×9 mm with a 14.0 mm radial section at 40 mm bore. It has the same bore and outside diameter as the 6008 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16008?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16008 — the open (unsealed) execution, 40×68×9 mm per ISO 15. Quoted values: C 12.62 kN, C0 9.65 kN, mass 127 g. Limiting speed 15200 rpm, reference speed 7800 rpm. The industry-neutral page spelling 16008 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16008", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16011", "brand": "FAG", "manufacturer_designation": "FAG 16011", "series": "16000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 19.3, "static_load_kN": 16.3, "limiting_speed_rpm": 10900, "reference_speed_rpm": 6000, "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16011.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16011 with C3 for those conditions.", "The 160xx narrow section at 55 mm bore shares the 90 mm outside diameter of the 6011 but is only 11 mm wide; a 6011 in an 11 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16011 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16011 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16011-C3. No clearance suffix means normal CN clearance.", "The open 16011 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16011 bearing?", "a": "A 16011 deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 11 mm width (2.165 × 3.543 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16011 bore code work?", "a": "The last two digits of 16011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 11 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16011 mean?", "a": "A bare 16011 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 55 mm bore?", "a": "160 is the narrow extra-light section: 90×11 mm with a 17.5 mm radial section at 55 mm bore. It has the same bore and outside diameter as the 6011 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16011?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16011 — the open (unsealed) execution, 55×90×11 mm per ISO 15. Quoted values: C 19.3 kN, C0 16.3 kN, mass 260 g. Limiting speed 10900 rpm, reference speed 6000 rpm. The industry-neutral page spelling 16011 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16011", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16026", "brand": "FAG", "manufacturer_designation": "FAG 16026", "series": "16000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 84, "static_load_kN": 82, "limiting_speed_rpm": 4650, "reference_speed_rpm": 3450, "weight_g": 2370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16026.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 130 mm bore shares the 200 mm outside diameter of the 6026 but is only 22 mm wide; a 6026 in a 22 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16026 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16026 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16026 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16026 bearing?", "a": "A 16026 deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 22 mm width (5.118 × 7.874 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16026 bore code work?", "a": "The last two digits of 16026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16026 mean?", "a": "A bare 16026 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 130 mm bore?", "a": "160 is the narrow extra-light section: 200×22 mm with a 35.0 mm radial section at 130 mm bore. It has the same bore and outside diameter as the 6026 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16026?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16026 — the open (unsealed) execution, 130×200×22 mm per ISO 15. Quoted values: C 84 kN, C0 82 kN, mass 2370 g. Limiting speed 4650 rpm, reference speed 3450 rpm. The industry-neutral page spelling 16026 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16026", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16028", "brand": "FAG", "manufacturer_designation": "FAG 16028", "series": "16000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 86, "static_load_kN": 87, "limiting_speed_rpm": 4400, "reference_speed_rpm": 3200, "weight_g": 2540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16028.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 140 mm bore shares the 210 mm outside diameter of the 6028 but is only 22 mm wide; a 6028 in a 22 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16028 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×210×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16028 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16028 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16028 bearing?", "a": "A 16028 deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 22 mm width (5.512 × 8.268 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16028 bore code work?", "a": "The last two digits of 16028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16028 mean?", "a": "A bare 16028 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 140 mm bore?", "a": "160 is the narrow extra-light section: 210×22 mm with a 35.0 mm radial section at 140 mm bore. It has the same bore and outside diameter as the 6028 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16028?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16028 — the open (unsealed) execution, 140×210×22 mm per ISO 15. Quoted values: C 86 kN, C0 87 kN, mass 2540 g. Limiting speed 4400 rpm, reference speed 3200 rpm. The industry-neutral page spelling 16028 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16028", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16030", "brand": "FAG", "manufacturer_designation": "FAG 16030", "series": "16000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 98, "static_load_kN": 99, "limiting_speed_rpm": 4050, "reference_speed_rpm": 3100, "weight_g": 3170, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16030.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 150 mm bore shares the 225 mm outside diameter of the 6030 but is only 24 mm wide; a 6030 in a 24 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16030 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16030 units.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16030 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16030 bearing?", "a": "A 16030 deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 24 mm width (5.906 × 8.858 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16030 bore code work?", "a": "The last two digits of 16030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16030 mean?", "a": "A bare 16030 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 150 mm bore?", "a": "160 is the narrow extra-light section: 225×24 mm with a 37.5 mm radial section at 150 mm bore. It has the same bore and outside diameter as the 6030 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16030?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16030 — the open (unsealed) execution, 150×225×24 mm per ISO 15. Quoted values: C 98 kN, C0 99 kN, mass 3170 g. Limiting speed 4050 rpm, reference speed 3100 rpm. The industry-neutral page spelling 16030 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16030", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16032", "brand": "FAG", "manufacturer_designation": "FAG 16032", "series": "16000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 109, "static_load_kN": 114, "limiting_speed_rpm": 3800, "reference_speed_rpm": 2950, "weight_g": 3750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16032.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 160 mm bore shares the 240 mm outside diameter of the 6032 but is only 25 mm wide; a 6032 in a 25 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16032 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16032 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16032 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16032 bearing?", "a": "A 16032 deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 25 mm width (6.299 × 9.449 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16032 bore code work?", "a": "The last two digits of 16032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16032 mean?", "a": "A bare 16032 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 160 mm bore?", "a": "160 is the narrow extra-light section: 240×25 mm with a 40.0 mm radial section at 160 mm bore. It has the same bore and outside diameter as the 6032 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16032?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16032 — the open (unsealed) execution, 160×240×25 mm per ISO 15. Quoted values: C 109 kN, C0 114 kN, mass 3750 g. Limiting speed 3800 rpm, reference speed 2950 rpm. The industry-neutral page spelling 16032 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16032", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16034", "brand": "FAG", "manufacturer_designation": "FAG 16034", "series": "16000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 131, "static_load_kN": 136, "limiting_speed_rpm": 3500, "reference_speed_rpm": 2850, "weight_g": 5100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16034.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 170 mm bore shares the 260 mm outside diameter of the 6034 but is only 28 mm wide; a 6034 in a 28 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16034 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16034 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16034 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16034 bearing?", "a": "A 16034 deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 28 mm width (6.693 × 10.236 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16034 bore code work?", "a": "The last two digits of 16034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16034 mean?", "a": "A bare 16034 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 170 mm bore?", "a": "160 is the narrow extra-light section: 260×28 mm with a 45.0 mm radial section at 170 mm bore. It has the same bore and outside diameter as the 6034 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16034?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16034 — the open (unsealed) execution, 170×260×28 mm per ISO 15. Quoted values: C 131 kN, C0 136 kN, mass 5100 g. Limiting speed 3500 rpm, reference speed 2850 rpm. The industry-neutral page spelling 16034 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16034", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "6034-2RS", "brand": "FAG", "manufacturer_designation": "FAG 6034-2RSR", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 179, "static_load_kN": 172, "limiting_speed_rpm": 1340, "weight_g": 7120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG's catalogue order number is 6034-2RSR (suffix -2RSR), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6034-2RS runs slower and cooler-limited than the open 6034; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6034-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6034-2RS.", "FAG catalogues the contact-sealed version as 6034-2RSR (suffix -2RSR, or -2HRS on Generation-C sizes), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing." ], "faq": [ { "q": "What are the dimensions of a 6034-2RS bearing?", "a": "A 6034-2RS deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6034-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 170 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the FAG designation and catalogue data for 6034-2RS?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 6034-2RSR — two contacting rubber seals over a lifetime grease fill (FAG suffix -2RSR/-2HRS), 170×260×42 mm per ISO 15. Quoted values: C 179 kN, C0 172 kN, mass 7120 g. Limiting speed 1340 rpm. The industry-neutral page spelling 6034-2RS follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6034", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [ "6034-2rsr" ], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16036", "brand": "FAG", "manufacturer_designation": "FAG 16036", "series": "16000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 140, "static_load_kN": 146, "limiting_speed_rpm": 3350, "reference_speed_rpm": 2950, "weight_g": 6860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16036.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 180 mm bore shares the 280 mm outside diameter of the 6036 but is only 31 mm wide; a 6036 in a 31 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16036 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×280×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16036 units.", "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16036 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16036 bearing?", "a": "A 16036 deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 31 mm width (7.087 × 11.024 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16036 bore code work?", "a": "The last two digits of 16036 are bore code 36, giving 36 × 5 = 180 mm bore. The 280 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16036 mean?", "a": "A bare 16036 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 180 mm bore?", "a": "160 is the narrow extra-light section: 280×31 mm with a 50.0 mm radial section at 180 mm bore. It has the same bore and outside diameter as the 6036 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16036?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16036 — the open (unsealed) execution, 180×280×31 mm per ISO 15. Quoted values: C 140 kN, C0 146 kN, mass 6860 g. Limiting speed 3350 rpm, reference speed 2950 rpm. The industry-neutral page spelling 16036 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16036", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16038", "brand": "FAG", "manufacturer_designation": "FAG 16038", "series": "16000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 158, "static_load_kN": 168, "limiting_speed_rpm": 3100, "reference_speed_rpm": 2650, "weight_g": 7040, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16038.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 190 mm bore shares the 290 mm outside diameter of the 6038 but is only 31 mm wide; a 6038 in a 31 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16038 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×290×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16038 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16038 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16038 bearing?", "a": "A 16038 deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 31 mm width (7.48 × 11.417 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16038 bore code work?", "a": "The last two digits of 16038 are bore code 38, giving 38 × 5 = 190 mm bore. The 290 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16038 mean?", "a": "A bare 16038 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 190 mm bore?", "a": "160 is the narrow extra-light section: 290×31 mm with a 50.0 mm radial section at 190 mm bore. It has the same bore and outside diameter as the 6038 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16038?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16038 — the open (unsealed) execution, 190×290×31 mm per ISO 15. Quoted values: C 158 kN, C0 168 kN, mass 7040 g. Limiting speed 3100 rpm, reference speed 2650 rpm. The industry-neutral page spelling 16038 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16038", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16040", "brand": "FAG", "manufacturer_designation": "FAG 16040", "series": "16000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 186, "static_load_kN": 202, "limiting_speed_rpm": 2850, "reference_speed_rpm": 2470, "weight_g": 8970, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16040.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 200 mm bore shares the 310 mm outside diameter of the 6040 but is only 34 mm wide; a 6040 in a 34 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16040 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×310×34 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16040 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16040 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16040 bearing?", "a": "A 16040 deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 34 mm width (7.874 × 12.205 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16040 bore code work?", "a": "The last two digits of 16040 are bore code 40, giving 40 × 5 = 200 mm bore. The 310 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16040 mean?", "a": "A bare 16040 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 200 mm bore?", "a": "160 is the narrow extra-light section: 310×34 mm with a 55.0 mm radial section at 200 mm bore. It has the same bore and outside diameter as the 6040 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16040?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16040 — the open (unsealed) execution, 200×310×34 mm per ISO 15. Quoted values: C 186 kN, C0 202 kN, mass 8970 g. Limiting speed 2850 rpm, reference speed 2470 rpm. The industry-neutral page spelling 16040 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16040", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6404-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 364, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6404-2RS runs slower and cooler-limited than the open 6404; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6404-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6404-2RS bearing?", "a": "A 6404-2RS deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 364 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6404 bore code work?", "a": "The last two digits of 6404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6404-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 20 mm bore?", "a": "The '4' is the heavy diameter series: 72×19 mm, 26.0 mm radial section at 20 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6404 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6404 uses the same ISO 15 envelope (20×72×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6404", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 30.7, "static_load_kN": 15, "load_derived": true }, { "sku": "6405-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 486, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6405-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 25 mm bore (80 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6405-2RS runs slower and cooler-limited than the open 6405; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6405-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6405-2RS bearing?", "a": "A 6405-2RS deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 486 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6405 bore code work?", "a": "The last two digits of 6405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6405-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 25 mm bore?", "a": "The '4' is the heavy diameter series: 80×21 mm, 27.5 mm radial section at 25 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6405 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6405 uses the same ISO 15 envelope (25×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6405", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 35.8, "static_load_kN": 19.3, "load_derived": true }, { "sku": "6406-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 664, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6406-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 30 mm bore (90 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6406-2RS runs slower and cooler-limited than the open 6406; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6406-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6406-2RS bearing?", "a": "A 6406-2RS deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 664 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6406 bore code work?", "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6406-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 30 mm bore?", "a": "The '4' is the heavy diameter series: 90×23 mm, 30.0 mm radial section at 30 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6406 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6406 uses the same ISO 15 envelope (30×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6406", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 43.6, "static_load_kN": 23.6, "load_derived": true }, { "sku": "6407-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 879, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6407-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6407-2RS runs slower and cooler-limited than the open 6407; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6407-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6407-2RS." ], "faq": [ { "q": "What are the dimensions of a 6407-2RS bearing?", "a": "A 6407-2RS deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 879 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6407 bore code work?", "a": "The last two digits of 6407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6407-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 35 mm bore?", "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6407 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6407 uses the same ISO 15 envelope (35×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6407", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 55.3, "static_load_kN": 31, "load_derived": true }, { "sku": "6408-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6408-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 40 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6408-2RS runs slower and cooler-limited than the open 6408; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6408-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6408-2RS bearing?", "a": "A 6408-2RS deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6408 bore code work?", "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6408-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 40 mm bore?", "a": "The '4' is the heavy diameter series: 110×27 mm, 35.0 mm radial section at 40 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6408 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6408 uses the same ISO 15 envelope (40×110×27 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6408", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 63.7, "static_load_kN": 36.5, "load_derived": true }, { "sku": "6409-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1438, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6409-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 45 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6409-2RS runs slower and cooler-limited than the open 6409; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6409-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6409-2RS-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6409-2RS bearing?", "a": "A 6409-2RS deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1438 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6409 bore code work?", "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6409-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 45 mm bore?", "a": "The '4' is the heavy diameter series: 120×29 mm, 37.5 mm radial section at 45 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6409 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6409 uses the same ISO 15 envelope (45×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6409", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 76.1, "static_load_kN": 45, "load_derived": true }, { "sku": "6410-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1789, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6410 with C3 for those conditions.", "The 64xx heavy section at 50 mm bore (130 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6410-2RS runs slower and cooler-limited than the open 6410; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6410-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6410-2RS bearing?", "a": "A 6410-2RS deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1789 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6410 bore code work?", "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6410-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 50 mm bore?", "a": "The '4' is the heavy diameter series: 130×31 mm, 40.0 mm radial section at 50 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6410 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6410 uses the same ISO 15 envelope (50×130×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6410", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 87.1, "static_load_kN": 52, "load_derived": true }, { "sku": "6411-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2192, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.", "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6411-2RS runs slower and cooler-limited than the open 6411; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6411-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6411-2RS bearing?", "a": "A 6411-2RS deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2192 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6411 bore code work?", "a": "The last two digits of 6411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6411-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 55 mm bore?", "a": "The '4' is the heavy diameter series: 140×33 mm, 42.5 mm radial section at 55 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6411 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6411 uses the same ISO 15 envelope (55×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6411", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 99.5, "static_load_kN": 62, "load_derived": true }, { "sku": "6412-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2651, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.", "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6412-2RS runs slower and cooler-limited than the open 6412; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6412-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6412-2RS bearing?", "a": "A 6412-2RS deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2651 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6412 bore code work?", "a": "The last two digits of 6412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6412-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 60 mm bore?", "a": "The '4' is the heavy diameter series: 150×35 mm, 45.0 mm radial section at 60 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6412 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6412 uses the same ISO 15 envelope (60×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6412", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 108, "static_load_kN": 69.5, "load_derived": true }, { "sku": "6413-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3169, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6413 with C3 for those conditions.", "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6413-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6413-2RS for that.", "Shielded 6413-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 37 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6413-ZZ bearing?", "a": "A 6413-ZZ deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 3169 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6413 bore code work?", "a": "The last two digits of 6413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6413-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 65 mm bore?", "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6413 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6413 uses the same ISO 15 envelope (65×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6413", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 119, "static_load_kN": 78, "load_derived": true }, { "sku": "6413-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3169, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6413 with C3 for those conditions.", "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6413-2RS runs slower and cooler-limited than the open 6413; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6413-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6413-2RS." ], "faq": [ { "q": "What are the dimensions of a 6413-2RS bearing?", "a": "A 6413-2RS deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 3169 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6413 bore code work?", "a": "The last two digits of 6413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6413-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 65 mm bore?", "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6413 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6413 uses the same ISO 15 envelope (65×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6413", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 119, "static_load_kN": 78, "load_derived": true }, { "sku": "6414-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4629, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6414 with C3 for those conditions.", "The 64xx heavy section at 70 mm bore (180 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6414-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6414-2RS for that.", "Shielded 6414-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6414-ZZ bearing?", "a": "A 6414-ZZ deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 4629 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6414 bore code work?", "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6414-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 70 mm bore?", "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6414 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6414 uses the same ISO 15 envelope (70×180×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6414", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 143, "static_load_kN": 104, "load_derived": true }, { "sku": "6414-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4629, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6414 with C3 for those conditions.", "The 64xx heavy section at 70 mm bore (180 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6414-2RS runs slower and cooler-limited than the open 6414; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6414-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6414-2RS bearing?", "a": "A 6414-2RS deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 4629 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6414 bore code work?", "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6414-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 70 mm bore?", "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6414 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6414 uses the same ISO 15 envelope (70×180×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6414", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 143, "static_load_kN": 104, "load_derived": true }, { "sku": "6400", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 10, "D_mm": 40, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 72, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6400 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6400 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 10 mm bore (40 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6400 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6400 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6400 bearing?", "a": "A 6400 deep-groove ball bearing has a 10 mm bore, 40 mm outer diameter and 12 mm width (0.394 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6400 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6400 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6400 mean?", "a": "A bare 6400 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 10 mm bore?", "a": "The '4' is the heavy diameter series: 40×12 mm, 15.0 mm radial section at 10 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6400 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6400 uses the same ISO 15 envelope (10×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6400", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6400-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 10, "D_mm": 40, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 72, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6400 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6400 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 10 mm bore (40 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6400-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6400-2RS for that.", "Shielded 6400-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6400-ZZ bearing?", "a": "A 6400-ZZ deep-groove ball bearing has a 10 mm bore, 40 mm outer diameter and 12 mm width (0.394 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6400 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6400 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6400-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 10 mm bore?", "a": "The '4' is the heavy diameter series: 40×12 mm, 15.0 mm radial section at 10 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6400 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6400 uses the same ISO 15 envelope (10×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6400", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6400-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 10, "D_mm": 40, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 72, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6400 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6400 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 10 mm bore (40 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6400-2RS runs slower and cooler-limited than the open 6400; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6400-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6400-2RS bearing?", "a": "A 6400-2RS deep-groove ball bearing has a 10 mm bore, 40 mm outer diameter and 12 mm width (0.394 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6400 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6400 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6400-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 10 mm bore?", "a": "The '4' is the heavy diameter series: 40×12 mm, 15.0 mm radial section at 10 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6400 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6400 uses the same ISO 15 envelope (10×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6400", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6401", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 12, "D_mm": 48, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 121, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6401 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 48 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6401 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 12 mm bore (48 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6401 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×48×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6401 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6401-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6401 bearing?", "a": "A 6401 deep-groove ball bearing has a 12 mm bore, 48 mm outer diameter and 14 mm width (0.472 × 1.89 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 121 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6401 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6401 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6401 mean?", "a": "A bare 6401 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 12 mm bore?", "a": "The '4' is the heavy diameter series: 48×14 mm, 18.0 mm radial section at 12 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6401 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6401 uses the same ISO 15 envelope (12×48×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6401", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6401-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 12, "D_mm": 48, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 121, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6401 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 48 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6401 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 12 mm bore (48 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6401-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6401-2RS for that.", "Shielded 6401-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6401-ZZ bearing?", "a": "A 6401-ZZ deep-groove ball bearing has a 12 mm bore, 48 mm outer diameter and 14 mm width (0.472 × 1.89 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 121 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6401 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6401 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6401-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 12 mm bore?", "a": "The '4' is the heavy diameter series: 48×14 mm, 18.0 mm radial section at 12 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6401 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6401 uses the same ISO 15 envelope (12×48×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6401", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6401-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 12, "D_mm": 48, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 121, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6401 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 48 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6401 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 12 mm bore (48 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6401-2RS runs slower and cooler-limited than the open 6401; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6401-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 48 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6401-2RS." ], "faq": [ { "q": "What are the dimensions of a 6401-2RS bearing?", "a": "A 6401-2RS deep-groove ball bearing has a 12 mm bore, 48 mm outer diameter and 14 mm width (0.472 × 1.89 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 121 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6401 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6401 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6401-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 12 mm bore?", "a": "The '4' is the heavy diameter series: 48×14 mm, 18.0 mm radial section at 12 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6401 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6401 uses the same ISO 15 envelope (12×48×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6401", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6402", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 15, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 149, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6402 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6402 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 15 mm bore (52 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6402 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6402 units.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6402 bearing?", "a": "A 6402 deep-groove ball bearing has a 15 mm bore, 52 mm outer diameter and 15 mm width (0.591 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 149 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6402 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6402 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6402 mean?", "a": "A bare 6402 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 15 mm bore?", "a": "The '4' is the heavy diameter series: 52×15 mm, 18.5 mm radial section at 15 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6402 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6402 uses the same ISO 15 envelope (15×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6402", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6402-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 15, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 149, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6402 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6402 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 15 mm bore (52 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6402-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6402-2RS for that.", "Shielded 6402-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6402-ZZ bearing?", "a": "A 6402-ZZ deep-groove ball bearing has a 15 mm bore, 52 mm outer diameter and 15 mm width (0.591 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 149 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6402 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6402 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6402-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 15 mm bore?", "a": "The '4' is the heavy diameter series: 52×15 mm, 18.5 mm radial section at 15 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6402 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6402 uses the same ISO 15 envelope (15×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6402", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6402-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 15, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 149, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6402 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6402 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 15 mm bore (52 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6402-2RS runs slower and cooler-limited than the open 6402; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6402-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6402-2RS bearing?", "a": "A 6402-2RS deep-groove ball bearing has a 15 mm bore, 52 mm outer diameter and 15 mm width (0.591 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 149 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6402 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6402 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6402-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 15 mm bore?", "a": "The '4' is the heavy diameter series: 52×15 mm, 18.5 mm radial section at 15 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6402 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6402 uses the same ISO 15 envelope (15×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6402", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6403-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 17, "D_mm": 62, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 242, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6403 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6403 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6403-2RS runs slower and cooler-limited than the open 6403; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6403-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6403-2RS-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6403-2RS bearing?", "a": "A 6403-2RS deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 242 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6403 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6403 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6403-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 17 mm bore?", "a": "The '4' is the heavy diameter series: 62×17 mm, 22.5 mm radial section at 17 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6403 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6403 uses the same ISO 15 envelope (17×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6403", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 22.9, "static_load_kN": 10.8, "load_derived": true }, { "sku": "6415-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 5496, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6415 carries bore code 15 = 75 mm. Outside diameter 190 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6415-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6415-2RS for that.", "Shielded 6415-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6415-ZZ." ], "faq": [ { "q": "What are the dimensions of a 6415-ZZ bearing?", "a": "A 6415-ZZ deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 5496 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6415 bore code work?", "a": "The last two digits of 6415 are bore code 15, giving 15 × 5 = 75 mm bore. The 190 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6415-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 75 mm bore?", "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6415 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6415 uses the same ISO 15 envelope (75×190×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6415", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 153, "static_load_kN": 114, "load_derived": true }, { "sku": "6415-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 5496, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6415 carries bore code 15 = 75 mm. Outside diameter 190 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6415-2RS runs slower and cooler-limited than the open 6415; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6415-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6415-2RS-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6415-2RS bearing?", "a": "A 6415-2RS deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 5496 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6415 bore code work?", "a": "The last two digits of 6415 are bore code 15, giving 15 × 5 = 75 mm bore. The 190 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6415-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 75 mm bore?", "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6415 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6415 uses the same ISO 15 envelope (75×190×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6415", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 153, "static_load_kN": 114, "load_derived": true }, { "sku": "6416-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 6463, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6416-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6416-2RS for that.", "Shielded 6416-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6416-ZZ bearing?", "a": "A 6416-ZZ deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 6463 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6416 bore code work?", "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6416-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 80 mm bore?", "a": "The '4' is the heavy diameter series: 200×48 mm, 60.0 mm radial section at 80 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6416 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6416 uses the same ISO 15 envelope (80×200×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6416", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 163, "static_load_kN": 125, "load_derived": true }, { "sku": "6416-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 6463, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6416-2RS runs slower and cooler-limited than the open 6416; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6416-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6416-2RS bearing?", "a": "A 6416-2RS deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 6463 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6416 bore code work?", "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6416-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 80 mm bore?", "a": "The '4' is the heavy diameter series: 200×48 mm, 60.0 mm radial section at 80 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6416 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6416 uses the same ISO 15 envelope (80×200×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6416", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 163, "static_load_kN": 125, "load_derived": true }, { "sku": "6417-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 85, "D_mm": 210, "B_mm": 52, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 7684, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 85 mm bore (210 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6417-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6417-2RS for that.", "Shielded 6417-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6417-ZZ-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6417-ZZ bearing?", "a": "A 6417-ZZ deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 7684 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6417 bore code work?", "a": "The last two digits of 6417 are bore code 17, giving 17 × 5 = 85 mm bore. The 210 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6417-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 85 mm bore?", "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6417 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6417 uses the same ISO 15 envelope (85×210×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6417", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 174, "static_load_kN": 137, "load_derived": true }, { "sku": "6417-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 85, "D_mm": 210, "B_mm": 52, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 7684, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 85 mm bore (210 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6417-2RS runs slower and cooler-limited than the open 6417; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6417-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 52 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6417-2RS bearing?", "a": "A 6417-2RS deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 7684 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6417 bore code work?", "a": "The last two digits of 6417 are bore code 17, giving 17 × 5 = 85 mm bore. The 210 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6417-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 85 mm bore?", "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6417 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6417 uses the same ISO 15 envelope (85×210×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6417", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 174, "static_load_kN": 137, "load_derived": true }, { "sku": "6418-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 90, "D_mm": 225, "B_mm": 54, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 9203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6418 carries bore code 18 = 90 mm. Outside diameter 225 mm and width 54 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6418-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6418-2RS for that.", "Shielded 6418-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6418-ZZ bearing?", "a": "A 6418-ZZ deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 9203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6418 bore code work?", "a": "The last two digits of 6418 are bore code 18, giving 18 × 5 = 90 mm bore. The 225 mm outside diameter and 54 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6418-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 90 mm bore?", "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6418 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6418 uses the same ISO 15 envelope (90×225×54 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6418", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 186, "static_load_kN": 150, "load_derived": true }, { "sku": "6418-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 90, "D_mm": 225, "B_mm": 54, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 9203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6418 carries bore code 18 = 90 mm. Outside diameter 225 mm and width 54 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6418-2RS runs slower and cooler-limited than the open 6418; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6418-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6418-2RS bearing?", "a": "A 6418-2RS deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 9203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6418 bore code work?", "a": "The last two digits of 6418 are bore code 18, giving 18 × 5 = 90 mm bore. The 225 mm outside diameter and 54 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6418-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 90 mm bore?", "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6418 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6418 uses the same ISO 15 envelope (90×225×54 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6418", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 186, "static_load_kN": 150, "load_derived": true }, { "sku": "6419", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 95, "D_mm": 240, "B_mm": 55, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 10707, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6419 carries bore code 19 = 95 mm. Outside diameter 240 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 95 mm bore (240 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6419 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×240×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6419 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6419-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6419 bearing?", "a": "A 6419 deep-groove ball bearing has a 95 mm bore, 240 mm outer diameter and 55 mm width (3.74 × 9.449 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 10707 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6419 bore code work?", "a": "The last two digits of 6419 are bore code 19, giving 19 × 5 = 95 mm bore. The 240 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6419 mean?", "a": "A bare 6419 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 95 mm bore?", "a": "The '4' is the heavy diameter series: 240×55 mm, 72.5 mm radial section at 95 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6419 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6419 uses the same ISO 15 envelope (95×240×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6419", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6419-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 95, "D_mm": 240, "B_mm": 55, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 10707, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6419 carries bore code 19 = 95 mm. Outside diameter 240 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 95 mm bore (240 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6419-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6419-2RS for that.", "Shielded 6419-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 55 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6419-ZZ bearing?", "a": "A 6419-ZZ deep-groove ball bearing has a 95 mm bore, 240 mm outer diameter and 55 mm width (3.74 × 9.449 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 10707 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6419 bore code work?", "a": "The last two digits of 6419 are bore code 19, giving 19 × 5 = 95 mm bore. The 240 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6419-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 95 mm bore?", "a": "The '4' is the heavy diameter series: 240×55 mm, 72.5 mm radial section at 95 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6419 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6419 uses the same ISO 15 envelope (95×240×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6419", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6419-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 95, "D_mm": 240, "B_mm": 55, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 10707, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6419 carries bore code 19 = 95 mm. Outside diameter 240 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 95 mm bore (240 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6419-2RS runs slower and cooler-limited than the open 6419; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6419-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6419-2RS." ], "faq": [ { "q": "What are the dimensions of a 6419-2RS bearing?", "a": "A 6419-2RS deep-groove ball bearing has a 95 mm bore, 240 mm outer diameter and 55 mm width (3.74 × 9.449 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 10707 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6419 bore code work?", "a": "The last two digits of 6419 are bore code 19, giving 19 × 5 = 95 mm bore. The 240 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6419-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 95 mm bore?", "a": "The '4' is the heavy diameter series: 240×55 mm, 72.5 mm radial section at 95 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6419 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6419 uses the same ISO 15 envelope (95×240×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6419", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6420", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 100, "D_mm": 250, "B_mm": 58, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 12203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6420 carries bore code 20 = 100 mm. Outside diameter 250 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 100 mm bore (250 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6420 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×250×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6420 units.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6420 bearing?", "a": "A 6420 deep-groove ball bearing has a 100 mm bore, 250 mm outer diameter and 58 mm width (3.937 × 9.843 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 12203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6420 bore code work?", "a": "The last two digits of 6420 are bore code 20, giving 20 × 5 = 100 mm bore. The 250 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6420 mean?", "a": "A bare 6420 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 100 mm bore?", "a": "The '4' is the heavy diameter series: 250×58 mm, 75.0 mm radial section at 100 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6420 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6420 uses the same ISO 15 envelope (100×250×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6420", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6420-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 100, "D_mm": 250, "B_mm": 58, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 12203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6420 carries bore code 20 = 100 mm. Outside diameter 250 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 100 mm bore (250 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6420-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6420-2RS for that.", "Shielded 6420-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6420-ZZ bearing?", "a": "A 6420-ZZ deep-groove ball bearing has a 100 mm bore, 250 mm outer diameter and 58 mm width (3.937 × 9.843 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 12203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6420 bore code work?", "a": "The last two digits of 6420 are bore code 20, giving 20 × 5 = 100 mm bore. The 250 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6420-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 100 mm bore?", "a": "The '4' is the heavy diameter series: 250×58 mm, 75.0 mm radial section at 100 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6420 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6420 uses the same ISO 15 envelope (100×250×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6420", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6420-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 100, "D_mm": 250, "B_mm": 58, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 12203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6420 carries bore code 20 = 100 mm. Outside diameter 250 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 100 mm bore (250 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6420-2RS runs slower and cooler-limited than the open 6420; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6420-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6420-2RS bearing?", "a": "A 6420-2RS deep-groove ball bearing has a 100 mm bore, 250 mm outer diameter and 58 mm width (3.937 × 9.843 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 12203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6420 bore code work?", "a": "The last two digits of 6420 are bore code 20, giving 20 × 5 = 100 mm bore. The 250 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6420-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 100 mm bore?", "a": "The '4' is the heavy diameter series: 250×58 mm, 75.0 mm radial section at 100 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6420 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6420 uses the same ISO 15 envelope (100×250×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6420", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6006", "brand": "NSK", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 116, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), VV (non-contact seals) and DDU (contact seals).", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6006 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×55×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6006 units.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6006 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 14.6/8.3 kN ratings, mass 116 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6006; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6006 bearing?", "a": "A 6006 deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6006 mean?", "a": "A bare 6006 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6006?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6006 — the open (unsealed) execution, 30×55×13 mm per ISO 15. Quoted values: C 14.6 kN, C0 8.3 kN, mass 116 g. The industry-neutral page spelling 6006 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6006", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." }, { "equiv_sku": "7006", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6006", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 8.3 }, { "sku": "6009-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6009VV", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23, "static_load_kN": 15.2, "weight_g": 241, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6009-RSR run faster than contact-seal 6009-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6009-2RS instead.", "The non-contact lip of 6009-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6009VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 23/15.2 kN ratings, mass 241 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6009VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6009-RSR bearing?", "a": "A 6009-RSR deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6009-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6009-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6009VV — two low-friction non-contact rubber seals (NSK suffix VV), 45×75×16 mm per ISO 15. Quoted values: C 23 kN, C0 15.2 kN, mass 241 g. The industry-neutral page spelling 6009-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6009", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7009", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009VV" ], "locale_variants": {} }, { "sku": "6011-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6011VV", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 31, "static_load_kN": 21.2, "weight_g": 381, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6011-RSR run faster than contact-seal 6011-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6011-2RS instead.", "The non-contact lip of 6011-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6011VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 31/21.2 kN ratings, mass 381 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6011VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6011-RSR bearing?", "a": "A 6011-RSR deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6011-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6011-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6011VV — two low-friction non-contact rubber seals (NSK suffix VV), 55×90×18 mm per ISO 15. Quoted values: C 31 kN, C0 21.2 kN, mass 381 g. The industry-neutral page spelling 6011-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6011", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7011", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011VV" ], "locale_variants": {} }, { "sku": "6013-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6013VV", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 33.5, "static_load_kN": 25.2, "weight_g": 439, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6013-RSR run faster than contact-seal 6013-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6013-2RS instead.", "The non-contact lip of 6013-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6013VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 33.5/25.2 kN ratings, mass 439 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6013VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6013-RSR bearing?", "a": "A 6013-RSR deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6013-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6013-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6013VV — two low-friction non-contact rubber seals (NSK suffix VV), 65×100×18 mm per ISO 15. Quoted values: C 33.5 kN, C0 25.2 kN, mass 439 g. The industry-neutral page spelling 6013-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6013", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7013", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013VV" ], "locale_variants": {} }, { "sku": "6014-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6014VV", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 31, "weight_g": 608, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6014-RSR run faster than contact-seal 6014-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6014-2RS instead.", "The non-contact lip of 6014-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6014-RSR.", "NSK catalogues this low-friction non-contact seal as 6014VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 42/31 kN ratings, mass 608 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6014VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6014-RSR bearing?", "a": "A 6014-RSR deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6014-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6014-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6014VV — two low-friction non-contact rubber seals (NSK suffix VV), 70×110×20 mm per ISO 15. Quoted values: C 42 kN, C0 31 kN, mass 608 g. The industry-neutral page spelling 6014-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6014", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7014", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014VV" ], "locale_variants": {} }, { "sku": "6016-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6016VV", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 52.5, "static_load_kN": 40, "weight_g": 872, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6016-RSR run faster than contact-seal 6016-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6016-2RS instead.", "The non-contact lip of 6016-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6016-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6016VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 52.5/40 kN ratings, mass 872 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6016VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6016-RSR bearing?", "a": "A 6016-RSR deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6016-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6016-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6016VV — two low-friction non-contact rubber seals (NSK suffix VV), 80×125×22 mm per ISO 15. Quoted values: C 52.5 kN, C0 40 kN, mass 872 g. The industry-neutral page spelling 6016-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6016", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7016", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016VV" ], "locale_variants": {} }, { "sku": "6017-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6017VV", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 54.5, "static_load_kN": 43, "weight_g": 918, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6017-RSR run faster than contact-seal 6017-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6017-2RS instead.", "The non-contact lip of 6017-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6017VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 54.5/43 kN ratings, mass 918 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6017VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6017-RSR bearing?", "a": "A 6017-RSR deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6017-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 85 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (130×22 mm, 22.5 mm radial section) at 85 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6017-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6017VV — two low-friction non-contact rubber seals (NSK suffix VV), 85×130×22 mm per ISO 15. Quoted values: C 54.5 kN, C0 43 kN, mass 918 g. The industry-neutral page spelling 6017-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6017", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7017", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6017VV" ], "locale_variants": {} }, { "sku": "6018-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6018VV", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64, "static_load_kN": 50, "weight_g": 1190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6018-RSR run faster than contact-seal 6018-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6018-2RS instead.", "The non-contact lip of 6018-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6018VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 64/50 kN ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6018VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6018-RSR bearing?", "a": "A 6018-RSR deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6018-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 90 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (140×24 mm, 25.0 mm radial section) at 90 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6018-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6018VV — two low-friction non-contact rubber seals (NSK suffix VV), 90×140×24 mm per ISO 15. Quoted values: C 64 kN, C0 50 kN, mass 1190 g. The industry-neutral page spelling 6018-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6018", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7018", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6018VV" ], "locale_variants": {} }, { "sku": "6019-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6019VV", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.5, "static_load_kN": 54, "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6019-RSR run faster than contact-seal 6019-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6019-2RS instead.", "The non-contact lip of 6019-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6019VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 66.5/54 kN ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6019VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6019-RSR bearing?", "a": "A 6019-RSR deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6019 bore code work?", "a": "The last two digits of 6019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6019-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6019-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6019VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×145×24 mm per ISO 15. Quoted values: C 66.5 kN, C0 54 kN, mass 1230 g. The industry-neutral page spelling 6019-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6019", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7019", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6019VV" ], "locale_variants": {} }, { "sku": "6020-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6020VV", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66, "static_load_kN": 54, "weight_g": 1290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6020-RSR run faster than contact-seal 6020-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6020-2RS instead.", "The non-contact lip of 6020-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6020-RSR.", "NSK catalogues this low-friction non-contact seal as 6020VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 66/54 kN ratings, mass 1290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6020VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6020-RSR bearing?", "a": "A 6020-RSR deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6020 bore code work?", "a": "The last two digits of 6020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6020-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6020-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6020VV — two low-friction non-contact rubber seals (NSK suffix VV), 100×150×24 mm per ISO 15. Quoted values: C 66 kN, C0 54 kN, mass 1290 g. The industry-neutral page spelling 6020-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6020", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7020", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6020VV" ], "locale_variants": {} }, { "sku": "6021-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6021VV", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 79.5, "static_load_kN": 66, "weight_g": 1580, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6021-RSR run faster than contact-seal 6021-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6021-2RS instead.", "The non-contact lip of 6021-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6021VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 79.5/66 kN ratings, mass 1580 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6021VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6021-RSR bearing?", "a": "A 6021-RSR deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6021-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6021-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6021VV — two low-friction non-contact rubber seals (NSK suffix VV), 105×160×26 mm per ISO 15. Quoted values: C 79.5 kN, C0 66 kN, mass 1580 g. The industry-neutral page spelling 6021-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6021", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7021", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6021VV" ], "locale_variants": {} }, { "sku": "6022-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6022VV", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93, "static_load_kN": 73, "weight_g": 1940, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6022-RSR run faster than contact-seal 6022-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6022-2RS instead.", "The non-contact lip of 6022-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6022-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6022VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 93/73 kN ratings, mass 1940 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6022VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6022-RSR bearing?", "a": "A 6022-RSR deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6022-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6022-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6022VV — two low-friction non-contact rubber seals (NSK suffix VV), 110×170×28 mm per ISO 15. Quoted values: C 93 kN, C0 73 kN, mass 1940 g. The industry-neutral page spelling 6022-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6022", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7022", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6022VV" ], "locale_variants": {} }, { "sku": "6024-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6024VV", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 97, "static_load_kN": 80, "weight_g": 2080, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6024-RSR run faster than contact-seal 6024-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6024-2RS instead.", "The non-contact lip of 6024-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6024VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 97/80 kN ratings, mass 2080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6024VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6024-RSR bearing?", "a": "A 6024-RSR deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6024-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6024-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6024VV — two low-friction non-contact rubber seals (NSK suffix VV), 120×180×28 mm per ISO 15. Quoted values: C 97 kN, C0 80 kN, mass 2080 g. The industry-neutral page spelling 6024-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6024", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024VV" ], "locale_variants": {} }, { "sku": "6030-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6030VV", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 138, "static_load_kN": 126, "weight_g": 4240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6030-RSR run faster than contact-seal 6030-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6030-2RS instead.", "The non-contact lip of 6030-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 150 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6030VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 138/126 kN ratings, mass 4240 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6030VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6030-RSR bearing?", "a": "A 6030-RSR deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6030-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6030-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6030VV — two low-friction non-contact rubber seals (NSK suffix VV), 150×225×35 mm per ISO 15. Quoted values: C 138 kN, C0 126 kN, mass 4240 g. The industry-neutral page spelling 6030-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6030", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6030VV" ], "locale_variants": {} }, { "sku": "6034-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6034VV", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 177, "static_load_kN": 161, "weight_g": 6890, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6034-RSR run faster than contact-seal 6034-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6034-2RS instead.", "The non-contact lip of 6034-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 170 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6034-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6034VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 177/161 kN ratings, mass 6890 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6034VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6034-RSR bearing?", "a": "A 6034-RSR deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6034-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 170 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6034-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6034VV — two low-friction non-contact rubber seals (NSK suffix VV), 170×260×42 mm per ISO 15. Quoted values: C 177 kN, C0 161 kN, mass 6890 g. The industry-neutral page spelling 6034-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6034", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6034VV" ], "locale_variants": {} }, { "sku": "6034-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6034ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 177, "static_load_kN": 161, "weight_g": 6890, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6034-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6034-2RS for that.", "Shielded 6034-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 42 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6034ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 177/161 kN ratings, mass 6890 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6034ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6034-ZZ bearing?", "a": "A 6034-ZZ deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6034-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 170 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6034-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6034ZZ — two non-contact steel shields (NSK suffix ZZ), 170×260×42 mm per ISO 15. Quoted values: C 177 kN, C0 161 kN, mass 6890 g. The industry-neutral page spelling 6034-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6034", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6034ZZ" ], "locale_variants": {} }, { "sku": "6036-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6036VV", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 198, "static_load_kN": 185, "weight_g": 8880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6036-RSR run faster than contact-seal 6036-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6036-2RS instead.", "The non-contact lip of 6036-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 180 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6036VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 198/185 kN ratings, mass 8880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6036VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6036-RSR bearing?", "a": "A 6036-RSR deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6036 bore code work?", "a": "The last two digits of 6036 are bore code 36, giving 36 × 5 = 180 mm bore. The 280 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6036-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 180 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (280×46 mm, 50.0 mm radial section) at 180 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6036-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6036VV — two low-friction non-contact rubber seals (NSK suffix VV), 180×280×46 mm per ISO 15. Quoted values: C 198 kN, C0 185 kN, mass 8880 g. The industry-neutral page spelling 6036-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6036", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6036VV" ], "locale_variants": {} }, { "sku": "6036-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6036ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 198, "static_load_kN": 185, "weight_g": 8880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6036-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6036-2RS for that.", "Shielded 6036-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 280 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6036-ZZ.", "NSK catalogues the shielded version as 6036ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 198/185 kN ratings, mass 8880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6036ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6036-ZZ bearing?", "a": "A 6036-ZZ deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6036 bore code work?", "a": "The last two digits of 6036 are bore code 36, giving 36 × 5 = 180 mm bore. The 280 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6036-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 180 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (280×46 mm, 50.0 mm radial section) at 180 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6036-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6036ZZ — two non-contact steel shields (NSK suffix ZZ), 180×280×46 mm per ISO 15. Quoted values: C 198 kN, C0 185 kN, mass 8880 g. The industry-neutral page spelling 6036-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6036", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6036ZZ" ], "locale_variants": {} }, { "sku": "6038-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6038ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 207, "static_load_kN": 201, "weight_g": 9390, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 190 mm bore uses a smaller 290 mm OD than a 6238; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6038-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6038-2RS for that.", "Shielded 6038-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6038-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6038ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 207/201 kN ratings, mass 9390 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6038ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6038-ZZ bearing?", "a": "A 6038-ZZ deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6038 bore code work?", "a": "The last two digits of 6038 are bore code 38, giving 38 × 5 = 190 mm bore. The 290 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6038-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 190 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (290×46 mm, 50.0 mm radial section) at 190 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6038-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6038ZZ — two non-contact steel shields (NSK suffix ZZ), 190×290×46 mm per ISO 15. Quoted values: C 207 kN, C0 201 kN, mass 9390 g. The industry-neutral page spelling 6038-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6038", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6038ZZ" ], "locale_variants": {} }, { "sku": "6040-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6040ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 51, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 228, "static_load_kN": 226, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 51 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 200 mm bore uses a smaller 310 mm OD than a 6240; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6040-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6040-2RS for that.", "Shielded 6040-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 51 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6040ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 228/226 kN ratings, mass 12000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6040ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6040-ZZ bearing?", "a": "A 6040-ZZ deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 51 mm width (7.874 × 12.205 × 2.008 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6040 bore code work?", "a": "The last two digits of 6040 are bore code 40, giving 40 × 5 = 200 mm bore. The 310 mm outside diameter and 51 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6040-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 200 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (310×51 mm, 55.0 mm radial section) at 200 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6040-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6040ZZ — two non-contact steel shields (NSK suffix ZZ), 200×310×51 mm per ISO 15. Quoted values: C 228 kN, C0 226 kN, mass 12000 g. The industry-neutral page spelling 6040-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6040", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6040ZZ" ], "locale_variants": {} }, { "sku": "6040", "brand": "NSK", "manufacturer_designation": "NSK 6040", "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": "steel", "dynamic_load_kN": 228, "static_load_kN": 226, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 51 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 200 mm bore uses a smaller 310 mm OD than a 6240; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6040 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×310×51 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6040 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6040-C3. No clearance suffix means normal CN clearance.", "The open 6040 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 228/226 kN ratings, mass 12000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6040; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6040 bearing?", "a": "A 6040 deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 51 mm width (7.874 × 12.205 × 2.008 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6040 bore code work?", "a": "The last two digits of 6040 are bore code 40, giving 40 × 5 = 200 mm bore. The 310 mm outside diameter and 51 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6040 mean?", "a": "A bare 6040 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 200 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (310×51 mm, 55.0 mm radial section) at 200 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6040?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6040 — the open (unsealed) execution, 200×310×51 mm per ISO 15. Quoted values: C 228 kN, C0 226 kN, mass 12000 g. The industry-neutral page spelling 6040 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6040", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6044-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6044ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 259, "static_load_kN": 271, "weight_g": 18600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 220 mm bore uses a smaller 340 mm OD than a 6244; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6044-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6044-2RS for that.", "Shielded 6044-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6044-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6044ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 259/271 kN ratings, mass 18600 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6044ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6044-ZZ bearing?", "a": "A 6044-ZZ deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6044 bore code work?", "a": "The last two digits of 6044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6044-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 220 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (340×56 mm, 60.0 mm radial section) at 220 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6044-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6044ZZ — two non-contact steel shields (NSK suffix ZZ), 220×340×56 mm per ISO 15. Quoted values: C 259 kN, C0 271 kN, mass 18600 g. The industry-neutral page spelling 6044-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6044", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6044ZZ" ], "locale_variants": {} }, { "sku": "61800-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6800VV", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1.89, "static_load_kN": 0.84, "weight_g": 5, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "RSR low-friction seals on 61800-RSR run faster than contact-seal 61800-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61800-2RS instead.", "The non-contact lip of 61800-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61800-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6800VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 1.89/0.84 kN ratings, mass 5 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6800VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61800-RSR bearing?", "a": "A 61800-RSR deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61800-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61800-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6800VV — two low-friction non-contact rubber seals (NSK suffix VV), 10×19×5 mm per ISO 15. Quoted values: C 1.89 kN, C0 0.84 kN, mass 5 g. The industry-neutral page spelling 61800-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61800", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6800VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6800VV" ], "locale_variants": {} }, { "sku": "61801-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6801VV", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.11, "static_load_kN": 1.04, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61801 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "RSR low-friction seals on 61801-RSR run faster than contact-seal 61801-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61801-2RS instead.", "The non-contact lip of 61801-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6801VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 2.11/1.04 kN ratings, mass 6 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6801VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61801-RSR bearing?", "a": "A 61801-RSR deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61801-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 12 mm bore?", "a": "618 is an extra-thin section: 21×5 mm, only 4.5 mm radial section at 12 mm bore, far smaller than a 6201, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61801-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6801VV — two low-friction non-contact rubber seals (NSK suffix VV), 12×21×5 mm per ISO 15. Quoted values: C 2.11 kN, C0 1.04 kN, mass 6 g. The industry-neutral page spelling 61801-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61801", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6801VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6801VV" ], "locale_variants": {} }, { "sku": "61802-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6802VV", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.28, "static_load_kN": 1.26, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "RSR low-friction seals on 61802-RSR run faster than contact-seal 61802-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61802-2RS instead.", "The non-contact lip of 61802-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6802VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 2.28/1.26 kN ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6802VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61802-RSR bearing?", "a": "A 61802-RSR deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61802-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61802-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6802VV — two low-friction non-contact rubber seals (NSK suffix VV), 15×24×5 mm per ISO 15. Quoted values: C 2.28 kN, C0 1.26 kN, mass 7 g. The industry-neutral page spelling 61802-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61802", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6802VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6802VV" ], "locale_variants": {} }, { "sku": "61804-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6804ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.", "ZZ shields are non-contact: 61804-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61804-2RS for that.", "Shielded 61804-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61804-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6804ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 4.4/2.47 kN ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6804ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61804-ZZ bearing?", "a": "A 61804-ZZ deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61804-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 20 mm bore?", "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61804-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6804ZZ — two non-contact steel shields (NSK suffix ZZ), 20×32×7 mm per ISO 15. Quoted values: C 4.4 kN, C0 2.47 kN, mass 17 g. The industry-neutral page spelling 61804-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61804", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6804ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71804", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6804ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6804ZZ", "material": "GCr15", "dynamic_load_kN": 4.4, "static_load_kN": 2.47 }, { "sku": "61805-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6805ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "ZZ shields are non-contact: 61805-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61805-2RS for that.", "Shielded 61805-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6805ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 4.95/3.15 kN ratings, mass 21 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6805ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61805-ZZ bearing?", "a": "A 61805-ZZ deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61805 bore code work?", "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61805-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61805-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6805ZZ — two non-contact steel shields (NSK suffix ZZ), 25×37×7 mm per ISO 15. Quoted values: C 4.95 kN, C0 3.15 kN, mass 21 g. The industry-neutral page spelling 61805-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61805", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61805-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61805", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6805ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71805", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6805ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6805ZZ", "material": "GCr15", "dynamic_load_kN": 4.95, "static_load_kN": 3.15 }, { "sku": "61806-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 24, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6806ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "ZZ shields are non-contact: 61806-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61806-2RS for that.", "Shielded 61806-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6806ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 5.2/3.65 kN ratings, mass 24 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6806ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61806-ZZ bearing?", "a": "A 61806-ZZ deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61806-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61806-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6806ZZ — two non-contact steel shields (NSK suffix ZZ), 30×42×7 mm per ISO 15. Quoted values: C 5.2 kN, C0 3.65 kN, mass 24 g. The industry-neutral page spelling 61806-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61806", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61806-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61806-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61806", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6806ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71806", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6806ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6806ZZ", "material": "GCr15", "dynamic_load_kN": 5.2, "static_load_kN": 3.65 }, { "sku": "61807-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 27, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6807ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "ZZ shields are non-contact: 61807-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61807-2RS for that.", "Shielded 61807-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6807ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 5.4/4.1 kN ratings, mass 27 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6807ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61807-ZZ bearing?", "a": "A 61807-ZZ deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61807 bore code work?", "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61807-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61807-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6807ZZ — two non-contact steel shields (NSK suffix ZZ), 35×47×7 mm per ISO 15. Quoted values: C 5.4 kN, C0 4.1 kN, mass 27 g. The industry-neutral page spelling 61807-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61807", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61807-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61807-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61807", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6807ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71807", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6807ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6807ZZ", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 4.1 }, { "sku": "61808-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 31, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6808ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6208.", "ZZ shields are non-contact: 61808-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61808-2RS for that.", "Shielded 61808-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61808-ZZ.", "NSK catalogues the shielded version as 6808ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7/5.55 kN ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6808ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61808-ZZ bearing?", "a": "A 61808-ZZ deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61808-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61808-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6808ZZ — two non-contact steel shields (NSK suffix ZZ), 40×52×7 mm per ISO 15. Quoted values: C 7 kN, C0 5.55 kN, mass 31 g. The industry-neutral page spelling 61808-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61808", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61808-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61808-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61808", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6808ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71808", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6808ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6808ZZ", "material": "GCr15", "dynamic_load_kN": 7, "static_load_kN": 5.55 }, { "sku": "61809-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6809ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "ZZ shields are non-contact: 61809-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61809-2RS for that.", "Shielded 61809-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6809ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7.25/6.15 kN ratings, mass 38 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6809ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61809-ZZ bearing?", "a": "A 61809-ZZ deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61809-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61809-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6809ZZ — two non-contact steel shields (NSK suffix ZZ), 45×58×7 mm per ISO 15. Quoted values: C 7.25 kN, C0 6.15 kN, mass 38 g. The industry-neutral page spelling 61809-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61809", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61809-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61809-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61809", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6809ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71809", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6809ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6809ZZ", "material": "GCr15", "dynamic_load_kN": 7.25, "static_load_kN": 6.15 }, { "sku": "61810-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 50, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6810ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "ZZ shields are non-contact: 61810-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61810-2RS for that.", "Shielded 61810-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61810-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6810ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7.05/6.2 kN ratings, mass 50 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6810ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61810-ZZ bearing?", "a": "A 61810-ZZ deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61810-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 50 mm bore?", "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61810-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6810ZZ — two non-contact steel shields (NSK suffix ZZ), 50×65×7 mm per ISO 15. Quoted values: C 7.05 kN, C0 6.2 kN, mass 50 g. The industry-neutral page spelling 61810-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61810", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61810-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61810", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6810ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71810", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6810ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6810ZZ", "material": "GCr15", "dynamic_load_kN": 7.05, "static_load_kN": 6.2 }, { "sku": "61811-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 81, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6811ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "ZZ shields are non-contact: 61811-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61811-2RS for that.", "Shielded 61811-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6811ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 9.7/8.5 kN ratings, mass 81 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6811ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61811-ZZ bearing?", "a": "A 61811-ZZ deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61811-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61811-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6811ZZ — two non-contact steel shields (NSK suffix ZZ), 55×72×9 mm per ISO 15. Quoted values: C 9.7 kN, C0 8.5 kN, mass 81 g. The industry-neutral page spelling 61811-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61811", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6811ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71811", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6811ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6811ZZ", "material": "GCr15", "dynamic_load_kN": 9.7, "static_load_kN": 8.5 }, { "sku": "61812-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 103, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6812ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "ZZ shields are non-contact: 61812-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61812-2RS for that.", "Shielded 61812-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6812ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 12.6/10.9 kN ratings, mass 103 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6812ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61812-ZZ bearing?", "a": "A 61812-ZZ deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61812-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61812-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6812ZZ — two non-contact steel shields (NSK suffix ZZ), 60×78×10 mm per ISO 15. Quoted values: C 12.6 kN, C0 10.9 kN, mass 103 g. The industry-neutral page spelling 61812-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61812", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6812ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71812", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6812ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6812ZZ", "material": "GCr15", "dynamic_load_kN": 12.6, "static_load_kN": 10.9 }, { "sku": "61813-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 128, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6813ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "ZZ shields are non-contact: 61813-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61813-2RS for that.", "Shielded 61813-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6813ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 13.1/12.1 kN ratings, mass 128 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6813ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61813-ZZ bearing?", "a": "A 61813-ZZ deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61813 bore code work?", "a": "The last two digits of 61813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61813-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61813-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6813ZZ — two non-contact steel shields (NSK suffix ZZ), 65×85×10 mm per ISO 15. Quoted values: C 13.1 kN, C0 12.1 kN, mass 128 g. The industry-neutral page spelling 61813-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61813", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61813-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61813-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61813", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6813ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71813", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6813ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6813ZZ", "material": "GCr15", "dynamic_load_kN": 13.1, "static_load_kN": 12.1 }, { "sku": "61814-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 134, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6814ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "ZZ shields are non-contact: 61814-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61814-2RS for that.", "Shielded 61814-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61814-ZZ.", "NSK catalogues the shielded version as 6814ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 13.3/12.7 kN ratings, mass 134 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6814ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61814-ZZ bearing?", "a": "A 61814-ZZ deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61814-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61814-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6814ZZ — two non-contact steel shields (NSK suffix ZZ), 70×90×10 mm per ISO 15. Quoted values: C 13.3 kN, C0 12.7 kN, mass 134 g. The industry-neutral page spelling 61814-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61814", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6814ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71814", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6814ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6814ZZ", "material": "GCr15", "dynamic_load_kN": 13.3, "static_load_kN": 12.7 }, { "sku": "61815-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 149, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6815ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "ZZ shields are non-contact: 61815-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61815-2RS for that.", "Shielded 61815-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6815ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 13.8/13.9 kN ratings, mass 149 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6815ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61815-ZZ bearing?", "a": "A 61815-ZZ deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61815-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61815-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6815ZZ — two non-contact steel shields (NSK suffix ZZ), 75×95×10 mm per ISO 15. Quoted values: C 13.8 kN, C0 13.9 kN, mass 149 g. The industry-neutral page spelling 61815-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61815", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6815ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71815", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6815ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6815ZZ", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 13.9 }, { "sku": "61816-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6816VV", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 13.9, "static_load_kN": 14.5, "weight_g": 151, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "RSR low-friction seals on 61816-RSR run faster than contact-seal 61816-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61816-2RS instead.", "The non-contact lip of 61816-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61816-RSR.", "NSK catalogues this low-friction non-contact seal as 6816VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 13.9/14.5 kN ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6816VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61816-RSR bearing?", "a": "A 61816-RSR deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61816-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61816-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6816VV — two low-friction non-contact rubber seals (NSK suffix VV), 80×100×10 mm per ISO 15. Quoted values: C 13.9 kN, C0 14.5 kN, mass 151 g. The industry-neutral page spelling 61816-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61816", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6816VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71816", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6816VV" ], "locale_variants": {} }, { "sku": "61816-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 151, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6816ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "ZZ shields are non-contact: 61816-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61816-2RS for that.", "Shielded 61816-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61816-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6816ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 13.9/14.5 kN ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6816ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61816-ZZ bearing?", "a": "A 61816-ZZ deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61816-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61816-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6816ZZ — two non-contact steel shields (NSK suffix ZZ), 80×100×10 mm per ISO 15. Quoted values: C 13.9 kN, C0 14.5 kN, mass 151 g. The industry-neutral page spelling 61816-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61816", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6816ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71816", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6816ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6816ZZ", "material": "GCr15", "dynamic_load_kN": 13.9, "static_load_kN": 14.5 }, { "sku": "61817-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 263, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6817ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "ZZ shields are non-contact: 61817-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61817-2RS for that.", "Shielded 61817-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6817ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 20.6/20 kN ratings, mass 263 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6817ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61817-ZZ bearing?", "a": "A 61817-ZZ deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61817-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61817-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6817ZZ — two non-contact steel shields (NSK suffix ZZ), 85×110×13 mm per ISO 15. Quoted values: C 20.6 kN, C0 20 kN, mass 263 g. The industry-neutral page spelling 61817-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61817", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6817ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71817", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6817ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6817ZZ", "material": "GCr15", "dynamic_load_kN": 20.6, "static_load_kN": 20 }, { "sku": "61818-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 276, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6818ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "ZZ shields are non-contact: 61818-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61818-2RS for that.", "Shielded 61818-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6818ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 20.9/21 kN ratings, mass 276 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6818ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61818-ZZ bearing?", "a": "A 61818-ZZ deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61818-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61818-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6818ZZ — two non-contact steel shields (NSK suffix ZZ), 90×115×13 mm per ISO 15. Quoted values: C 20.9 kN, C0 21 kN, mass 276 g. The industry-neutral page spelling 61818-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61818", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6818ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71818", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6818ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6818ZZ", "material": "GCr15", "dynamic_load_kN": 20.9, "static_load_kN": 21 }, { "sku": "61819-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6819VV", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.2, "static_load_kN": 22, "weight_g": 297, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "RSR low-friction seals on 61819-RSR run faster than contact-seal 61819-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61819-2RS instead.", "The non-contact lip of 61819-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6819VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 21.2/22 kN ratings, mass 297 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6819VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61819-RSR bearing?", "a": "A 61819-RSR deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61819-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61819-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6819VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×120×13 mm per ISO 15. Quoted values: C 21.2 kN, C0 22 kN, mass 297 g. The industry-neutral page spelling 61819-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61819", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6819VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71819", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6819VV" ], "locale_variants": {} }, { "sku": "61819-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 297, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6819ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "ZZ shields are non-contact: 61819-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61819-2RS for that.", "Shielded 61819-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6819ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 21.2/22 kN ratings, mass 297 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6819ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61819-ZZ bearing?", "a": "A 61819-ZZ deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61819-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61819-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6819ZZ — two non-contact steel shields (NSK suffix ZZ), 95×120×13 mm per ISO 15. Quoted values: C 21.2 kN, C0 22 kN, mass 297 g. The industry-neutral page spelling 61819-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61819", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6819ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71819", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6819ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6819ZZ", "material": "GCr15", "dynamic_load_kN": 21.2, "static_load_kN": 22 }, { "sku": "61820-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6820ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "ZZ shields are non-contact: 61820-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61820-2RS for that.", "Shielded 61820-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61820-ZZ.", "NSK catalogues the shielded version as 6820ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 21.5/23 kN ratings, mass 310 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6820ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61820-ZZ bearing?", "a": "A 61820-ZZ deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61820-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61820-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6820ZZ — two non-contact steel shields (NSK suffix ZZ), 100×125×13 mm per ISO 15. Quoted values: C 21.5 kN, C0 23 kN, mass 310 g. The industry-neutral page spelling 61820-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61820", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6820ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71820", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6820ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6820ZZ", "material": "GCr15", "dynamic_load_kN": 21.5, "static_load_kN": 23 }, { "sku": "61821-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 324, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6821ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "ZZ shields are non-contact: 61821-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61821-2RS for that.", "Shielded 61821-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6821ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 21.8/23.9 kN ratings, mass 324 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6821ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61821-ZZ bearing?", "a": "A 61821-ZZ deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61821-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61821-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6821ZZ — two non-contact steel shields (NSK suffix ZZ), 105×130×13 mm per ISO 15. Quoted values: C 21.8 kN, C0 23.9 kN, mass 324 g. The industry-neutral page spelling 61821-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61821", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61821-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61821-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61821", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6821ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6821ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6821ZZ", "material": "GCr15", "dynamic_load_kN": 21.8, "static_load_kN": 23.9 }, { "sku": "61822-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 497, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6822ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "ZZ shields are non-contact: 61822-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61822-2RS for that.", "Shielded 61822-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61822-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6822ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 31/32.5 kN ratings, mass 497 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6822ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61822-ZZ bearing?", "a": "A 61822-ZZ deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61822-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61822-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6822ZZ — two non-contact steel shields (NSK suffix ZZ), 110×140×16 mm per ISO 15. Quoted values: C 31 kN, C0 32.5 kN, mass 497 g. The industry-neutral page spelling 61822-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61822", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6822ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6822ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6822ZZ", "material": "GCr15", "dynamic_load_kN": 31, "static_load_kN": 32.5 }, { "sku": "61824-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 537, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6824ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "ZZ shields are non-contact: 61824-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61824-2RS for that.", "Shielded 61824-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6824ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 32/35.5 kN ratings, mass 537 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6824ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61824-ZZ bearing?", "a": "A 61824-ZZ deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61824 bore code work?", "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61824-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61824-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6824ZZ — two non-contact steel shields (NSK suffix ZZ), 120×150×16 mm per ISO 15. Quoted values: C 32 kN, C0 35.5 kN, mass 537 g. The industry-neutral page spelling 61824-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61824", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6824ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6824ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6824ZZ", "material": "GCr15", "dynamic_load_kN": 32, "static_load_kN": 35.5 }, { "sku": "61826-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 758, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6826ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "ZZ shields are non-contact: 61826-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61826-2RS for that.", "Shielded 61826-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 165 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61826-ZZ.", "NSK catalogues the shielded version as 6826ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 40.5/44 kN ratings, mass 758 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6826ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61826-ZZ bearing?", "a": "A 61826-ZZ deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61826-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61826-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6826ZZ — two non-contact steel shields (NSK suffix ZZ), 130×165×18 mm per ISO 15. Quoted values: C 40.5 kN, C0 44 kN, mass 758 g. The industry-neutral page spelling 61826-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61826", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61826", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6826ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6826ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6826ZZ", "material": "GCr15", "dynamic_load_kN": 40.5, "static_load_kN": 44 }, { "sku": "61828-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 832, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6828ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "ZZ shields are non-contact: 61828-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61828-2RS for that.", "Shielded 61828-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61828-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6828ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 42/48 kN ratings, mass 832 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6828ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61828-ZZ bearing?", "a": "A 61828-ZZ deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61828-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61828-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6828ZZ — two non-contact steel shields (NSK suffix ZZ), 140×175×18 mm per ISO 15. Quoted values: C 42 kN, C0 48 kN, mass 832 g. The industry-neutral page spelling 61828-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61828", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61828", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6828ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6828ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6828ZZ", "material": "GCr15", "dynamic_load_kN": 42, "static_load_kN": 48 }, { "sku": "61830-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6830DDU", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 52.5, "static_load_kN": 58.5, "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "Contact seals add drag and heat: 61830-2RS runs slower and cooler-limited than the open 61830; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61830-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61830-2RS.", "NSK catalogues the contact-sealed version as 6830DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 52.5/58.5 kN ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61830-2RS bearing?", "a": "A 61830-2RS deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61830-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 150 mm bore?", "a": "618 is an extra-thin section: 190×20 mm, only 20.0 mm radial section at 150 mm bore, far smaller than a 6230, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61830-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6830DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 150×190×20 mm per ISO 15. Quoted values: C 52.5 kN, C0 58.5 kN, mass 1150 g. The industry-neutral page spelling 61830-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61830", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6830DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6830DDU" ], "locale_variants": {} }, { "sku": "61830-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6830VV", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 52.5, "static_load_kN": 58.5, "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "RSR low-friction seals on 61830-RSR run faster than contact-seal 61830-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61830-2RS instead.", "The non-contact lip of 61830-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 150 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61830-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6830VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 52.5/58.5 kN ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61830-RSR bearing?", "a": "A 61830-RSR deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61830-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 150 mm bore?", "a": "618 is an extra-thin section: 190×20 mm, only 20.0 mm radial section at 150 mm bore, far smaller than a 6230, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61830-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6830VV — two low-friction non-contact rubber seals (NSK suffix VV), 150×190×20 mm per ISO 15. Quoted values: C 52.5 kN, C0 58.5 kN, mass 1150 g. The industry-neutral page spelling 61830-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61830", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6830VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6830VV" ], "locale_variants": {} }, { "sku": "61830-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6830ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 52.5, "static_load_kN": 58.5, "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "ZZ shields are non-contact: 61830-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61830-2RS for that.", "Shielded 61830-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6830ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 52.5/58.5 kN ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61830-ZZ bearing?", "a": "A 61830-ZZ deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61830-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 150 mm bore?", "a": "618 is an extra-thin section: 190×20 mm, only 20.0 mm radial section at 150 mm bore, far smaller than a 6230, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61830-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6830ZZ — two non-contact steel shields (NSK suffix ZZ), 150×190×20 mm per ISO 15. Quoted values: C 52.5 kN, C0 58.5 kN, mass 1150 g. The industry-neutral page spelling 61830-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61830", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6830ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6830ZZ" ], "locale_variants": {} }, { "sku": "61832-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6832DDU", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 61, "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "Contact seals add drag and heat: 61832-2RS runs slower and cooler-limited than the open 61832; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61832-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61832-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the contact-sealed version as 6832DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 53/61 kN ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61832-2RS bearing?", "a": "A 61832-2RS deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61832 bore code work?", "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61832-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61832-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6832DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 160×200×20 mm per ISO 15. Quoted values: C 53 kN, C0 61 kN, mass 1230 g. The industry-neutral page spelling 61832-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61832", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6832DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6832DDU" ], "locale_variants": {} }, { "sku": "61832-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6832VV", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 61, "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "RSR low-friction seals on 61832-RSR run faster than contact-seal 61832-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61832-2RS instead.", "The non-contact lip of 61832-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 160 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6832VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 53/61 kN ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61832-RSR bearing?", "a": "A 61832-RSR deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61832 bore code work?", "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61832-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61832-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6832VV — two low-friction non-contact rubber seals (NSK suffix VV), 160×200×20 mm per ISO 15. Quoted values: C 53 kN, C0 61 kN, mass 1230 g. The industry-neutral page spelling 61832-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61832", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6832VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6832VV" ], "locale_variants": {} }, { "sku": "61832-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6832ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 61, "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "ZZ shields are non-contact: 61832-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61832-2RS for that.", "Shielded 61832-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61832-ZZ.", "NSK catalogues the shielded version as 6832ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 53/61 kN ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61832-ZZ bearing?", "a": "A 61832-ZZ deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61832 bore code work?", "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61832-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61832-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6832ZZ — two non-contact steel shields (NSK suffix ZZ), 160×200×20 mm per ISO 15. Quoted values: C 53 kN, C0 61 kN, mass 1230 g. The industry-neutral page spelling 61832-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61832", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6832ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6832ZZ" ], "locale_variants": {} }, { "sku": "61834-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6834DDU", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66, "static_load_kN": 75, "weight_g": 1860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "Contact seals add drag and heat: 61834-2RS runs slower and cooler-limited than the open 61834; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61834-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the contact-sealed version as 6834DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 66/75 kN ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61834-2RS bearing?", "a": "A 61834-2RS deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61834-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 170 mm bore?", "a": "618 is an extra-thin section: 215×22 mm, only 22.5 mm radial section at 170 mm bore, far smaller than a 6234, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61834-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6834DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 170×215×22 mm per ISO 15. Quoted values: C 66 kN, C0 75 kN, mass 1860 g. The industry-neutral page spelling 61834-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61834", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6834DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6834DDU" ], "locale_variants": {} }, { "sku": "61834-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6834VV", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66, "static_load_kN": 75, "weight_g": 1860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "RSR low-friction seals on 61834-RSR run faster than contact-seal 61834-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61834-2RS instead.", "The non-contact lip of 61834-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 170 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61834-RSR.", "NSK catalogues this low-friction non-contact seal as 6834VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 66/75 kN ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61834-RSR bearing?", "a": "A 61834-RSR deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61834-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 170 mm bore?", "a": "618 is an extra-thin section: 215×22 mm, only 22.5 mm radial section at 170 mm bore, far smaller than a 6234, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61834-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6834VV — two low-friction non-contact rubber seals (NSK suffix VV), 170×215×22 mm per ISO 15. Quoted values: C 66 kN, C0 75 kN, mass 1860 g. The industry-neutral page spelling 61834-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61834", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6834VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6834VV" ], "locale_variants": {} }, { "sku": "61834-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6834ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66, "static_load_kN": 75, "weight_g": 1860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "ZZ shields are non-contact: 61834-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61834-2RS for that.", "Shielded 61834-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61834-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6834ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 66/75 kN ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61834-ZZ bearing?", "a": "A 61834-ZZ deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61834-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 170 mm bore?", "a": "618 is an extra-thin section: 215×22 mm, only 22.5 mm radial section at 170 mm bore, far smaller than a 6234, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61834-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6834ZZ — two non-contact steel shields (NSK suffix ZZ), 170×215×22 mm per ISO 15. Quoted values: C 66 kN, C0 75 kN, mass 1860 g. The industry-neutral page spelling 61834-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61834", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6834ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6834ZZ" ], "locale_variants": {} }, { "sku": "61836-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6836VV", "series": "61800-series", "type": "deep_groove", "d_mm": 180, "D_mm": 225, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.5, "static_load_kN": 78.5, "weight_g": 1980, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61836 carries bore code 36 = 180 mm. Outside diameter 225 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 180 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6236.", "RSR low-friction seals on 61836-RSR run faster than contact-seal 61836-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61836-2RS instead.", "The non-contact lip of 61836-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 180 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61836-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6836VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 66.5/78.5 kN ratings, mass 1980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6836VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61836-RSR bearing?", "a": "A 61836-RSR deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61836 bore code work?", "a": "The last two digits of 61836 are bore code 36, giving 36 × 5 = 180 mm bore. The 225 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61836-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 180 mm bore?", "a": "618 is an extra-thin section: 225×22 mm, only 22.5 mm radial section at 180 mm bore, far smaller than a 6236, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61836-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6836VV — two low-friction non-contact rubber seals (NSK suffix VV), 180×225×22 mm per ISO 15. Quoted values: C 66.5 kN, C0 78.5 kN, mass 1980 g. The industry-neutral page spelling 61836-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61836", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6836VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6836VV" ], "locale_variants": {} }, { "sku": "61838-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6838VV", "series": "61800-series", "type": "deep_groove", "d_mm": 190, "D_mm": 240, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80.5, "static_load_kN": 93.5, "weight_g": 2530, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61838 carries bore code 38 = 190 mm. Outside diameter 240 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.", "RSR low-friction seals on 61838-RSR run faster than contact-seal 61838-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61838-2RS instead.", "The non-contact lip of 61838-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 190 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6838VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 80.5/93.5 kN ratings, mass 2530 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6838VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61838-RSR bearing?", "a": "A 61838-RSR deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61838 bore code work?", "a": "The last two digits of 61838 are bore code 38, giving 38 × 5 = 190 mm bore. The 240 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61838-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 190 mm bore?", "a": "618 is an extra-thin section: 240×24 mm, only 25.0 mm radial section at 190 mm bore, far smaller than a 6238, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61838-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6838VV — two low-friction non-contact rubber seals (NSK suffix VV), 190×240×24 mm per ISO 15. Quoted values: C 80.5 kN, C0 93.5 kN, mass 2530 g. The industry-neutral page spelling 61838-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61838", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6838VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6838VV" ], "locale_variants": {} }, { "sku": "61844-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6844ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 220, "D_mm": 270, "B_mm": 24, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 84, "static_load_kN": 107, "weight_g": 2900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61844 carries bore code 44 = 220 mm. Outside diameter 270 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 220 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6244.", "ZZ shields are non-contact: 61844-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61844-2RS for that.", "Shielded 61844-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 270 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61844-ZZ.", "NSK catalogues the shielded version as 6844ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 84/107 kN ratings, mass 2900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6844ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61844-ZZ bearing?", "a": "A 61844-ZZ deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61844 bore code work?", "a": "The last two digits of 61844 are bore code 44, giving 44 × 5 = 220 mm bore. The 270 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61844-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 220 mm bore?", "a": "618 is an extra-thin section: 270×24 mm, only 25.0 mm radial section at 220 mm bore, far smaller than a 6244, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61844-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6844ZZ — two non-contact steel shields (NSK suffix ZZ), 220×270×24 mm per ISO 15. Quoted values: C 84 kN, C0 107 kN, mass 2900 g. The industry-neutral page spelling 61844-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61844", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6844ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6844ZZ" ], "locale_variants": {} }, { "sku": "61900-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6900VV", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.97, "static_load_kN": 1.27, "weight_g": 9, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61900-RSR run faster than contact-seal 61900-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61900-2RS instead.", "The non-contact lip of 61900-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6900VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 2.97/1.27 kN ratings, mass 9 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6900VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61900-RSR bearing?", "a": "A 61900-RSR deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61900-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 10 mm bore?", "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6200 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61900-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6900VV — two low-friction non-contact rubber seals (NSK suffix VV), 10×22×6 mm per ISO 15. Quoted values: C 2.97 kN, C0 1.27 kN, mass 9 g. The industry-neutral page spelling 61900-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61900", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6900VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6900VV" ], "locale_variants": {} }, { "sku": "61901-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6901VV", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.2, "static_load_kN": 1.46, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61901-RSR run faster than contact-seal 61901-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61901-2RS instead.", "The non-contact lip of 61901-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 6 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6901VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 3.2/1.46 kN ratings, mass 10 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6901VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61901-RSR bearing?", "a": "A 61901-RSR deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61901-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 12 mm bore?", "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6201 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61901-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6901VV — two low-friction non-contact rubber seals (NSK suffix VV), 12×24×6 mm per ISO 15. Quoted values: C 3.2 kN, C0 1.46 kN, mass 10 g. The industry-neutral page spelling 61901-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61901", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6901VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6901VV" ], "locale_variants": {} }, { "sku": "61904-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6904ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61904-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61904-2RS for that.", "Shielded 61904-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6904ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7/3.7 kN ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6904ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61904-ZZ bearing?", "a": "A 61904-ZZ deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61904-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with a 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61904-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6904ZZ — two non-contact steel shields (NSK suffix ZZ), 20×37×9 mm per ISO 15. Quoted values: C 7 kN, C0 3.7 kN, mass 37 g. The industry-neutral page spelling 61904-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61904", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6904ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71904", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6904ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6904ZZ", "material": "GCr15", "dynamic_load_kN": 7, "static_load_kN": 3.7 }, { "sku": "61905-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 42, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6905ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61905-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61905-2RS for that.", "Shielded 61905-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6905ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7.75/4.55 kN ratings, mass 42 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6905ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61905-ZZ bearing?", "a": "A 61905-ZZ deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61905-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with a 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61905-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6905ZZ — two non-contact steel shields (NSK suffix ZZ), 25×42×9 mm per ISO 15. Quoted values: C 7.75 kN, C0 4.55 kN, mass 42 g. The industry-neutral page spelling 61905-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61905", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61905", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6905ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71905", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6905ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6905ZZ", "material": "GCr15", "dynamic_load_kN": 7.75, "static_load_kN": 4.55 }, { "sku": "61906-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6906ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61906-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61906-2RS for that.", "Shielded 61906-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6906ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7.95/5 kN ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6906ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61906-ZZ bearing?", "a": "A 61906-ZZ deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61906 bore code work?", "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61906-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with a 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61906-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6906ZZ — two non-contact steel shields (NSK suffix ZZ), 30×47×9 mm per ISO 15. Quoted values: C 7.95 kN, C0 5 kN, mass 52 g. The industry-neutral page spelling 61906-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61906", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6906ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71906", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6906ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6906ZZ", "material": "GCr15", "dynamic_load_kN": 7.95, "static_load_kN": 5 }, { "sku": "61907-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 75, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6907ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61907-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61907-2RS for that.", "Shielded 61907-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 55 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61907-ZZ.", "NSK catalogues the shielded version as 6907ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 11.6/7.25 kN ratings, mass 75 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6907ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61907-ZZ bearing?", "a": "A 61907-ZZ deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61907 bore code work?", "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61907-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61907-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6907ZZ — two non-contact steel shields (NSK suffix ZZ), 35×55×10 mm per ISO 15. Quoted values: C 11.6 kN, C0 7.25 kN, mass 75 g. The industry-neutral page spelling 61907-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61907", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61907", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6907ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71907", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6907ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6907ZZ", "material": "GCr15", "dynamic_load_kN": 11.6, "static_load_kN": 7.25 }, { "sku": "61908-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 112, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6908ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61908-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61908-2RS for that.", "Shielded 61908-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6908ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 15/10 kN ratings, mass 112 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6908ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61908-ZZ bearing?", "a": "A 61908-ZZ deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61908-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 40 mm bore?", "a": "619 is a thin section one step above 618: 62×12 mm with a 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61908-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6908ZZ — two non-contact steel shields (NSK suffix ZZ), 40×62×12 mm per ISO 15. Quoted values: C 15 kN, C0 10 kN, mass 112 g. The industry-neutral page spelling 61908-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61908", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61908", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6908ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71908", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6908ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6908ZZ", "material": "GCr15", "dynamic_load_kN": 15, "static_load_kN": 10 }, { "sku": "61909-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 126, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6909ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61909-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61909-2RS for that.", "Shielded 61909-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61909-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6909ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 15.5/10.9 kN ratings, mass 126 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6909ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61909-ZZ bearing?", "a": "A 61909-ZZ deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61909-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with a 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61909-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6909ZZ — two non-contact steel shields (NSK suffix ZZ), 45×68×12 mm per ISO 15. Quoted values: C 15.5 kN, C0 10.9 kN, mass 126 g. The industry-neutral page spelling 61909-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61909", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6909ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71909", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6909ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6909ZZ", "material": "GCr15", "dynamic_load_kN": 15.5, "static_load_kN": 10.9 }, { "sku": "61910-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 135, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6910ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61910-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61910-2RS for that.", "Shielded 61910-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6910ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 16/11.7 kN ratings, mass 135 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6910ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61910-ZZ bearing?", "a": "A 61910-ZZ deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61910 bore code work?", "a": "The last two digits of 61910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61910-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with a 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61910-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6910ZZ — two non-contact steel shields (NSK suffix ZZ), 50×72×12 mm per ISO 15. Quoted values: C 16 kN, C0 11.7 kN, mass 135 g. The industry-neutral page spelling 61910-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61910", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6910ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71910", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6910ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6910ZZ", "material": "GCr15", "dynamic_load_kN": 16, "static_load_kN": 11.7 }, { "sku": "61911-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 189, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6911ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61911-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61911-2RS for that.", "Shielded 61911-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6911ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 17.6/13.3 kN ratings, mass 189 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6911ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61911-ZZ bearing?", "a": "A 61911-ZZ deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61911-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 55 mm bore?", "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61911-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6911ZZ — two non-contact steel shields (NSK suffix ZZ), 55×80×13 mm per ISO 15. Quoted values: C 17.6 kN, C0 13.3 kN, mass 189 g. The industry-neutral page spelling 61911-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61911", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6911ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71911", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6911ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6911ZZ", "material": "GCr15", "dynamic_load_kN": 17.6, "static_load_kN": 13.3 }, { "sku": "61912-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 192, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6912ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61912-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61912-2RS for that.", "Shielded 61912-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6912ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 21.4/16.3 kN ratings, mass 192 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6912ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61912-ZZ bearing?", "a": "A 61912-ZZ deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61912-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61912-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6912ZZ — two non-contact steel shields (NSK suffix ZZ), 60×85×13 mm per ISO 15. Quoted values: C 21.4 kN, C0 16.3 kN, mass 192 g. The industry-neutral page spelling 61912-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61912", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61912-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61912-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61912", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6912ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71912", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6912ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6912ZZ", "material": "GCr15", "dynamic_load_kN": 21.4, "static_load_kN": 16.3 }, { "sku": "61913-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 218, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6913ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61913-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61913-2RS for that.", "Shielded 61913-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61913-ZZ.", "NSK catalogues the shielded version as 6913ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 19.1/16.1 kN ratings, mass 218 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6913ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61913-ZZ bearing?", "a": "A 61913-ZZ deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61913-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61913-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6913ZZ — two non-contact steel shields (NSK suffix ZZ), 65×90×13 mm per ISO 15. Quoted values: C 19.1 kN, C0 16.1 kN, mass 218 g. The industry-neutral page spelling 61913-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61913", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6913ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71913", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6913ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6913ZZ", "material": "GCr15", "dynamic_load_kN": 19.1, "static_load_kN": 16.1 }, { "sku": "61914-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 349, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6914ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61914-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61914-2RS for that.", "Shielded 61914-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6914ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 26.1/21.2 kN ratings, mass 349 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6914ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61914-ZZ bearing?", "a": "A 61914-ZZ deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61914-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61914-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6914ZZ — two non-contact steel shields (NSK suffix ZZ), 70×100×16 mm per ISO 15. Quoted values: C 26.1 kN, C0 21.2 kN, mass 349 g. The industry-neutral page spelling 61914-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61914", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6914ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71914", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6914ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6914ZZ", "material": "GCr15", "dynamic_load_kN": 26.1, "static_load_kN": 21.2 }, { "sku": "61915-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 364, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6915ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61915-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61915-2RS for that.", "Shielded 61915-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61915-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6915ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 26.8/22.6 kN ratings, mass 364 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6915ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61915-ZZ bearing?", "a": "A 61915-ZZ deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61915 bore code work?", "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61915-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61915-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6915ZZ — two non-contact steel shields (NSK suffix ZZ), 75×105×16 mm per ISO 15. Quoted values: C 26.8 kN, C0 22.6 kN, mass 364 g. The industry-neutral page spelling 61915-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61915", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6915ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71915", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6915ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6915ZZ", "material": "GCr15", "dynamic_load_kN": 26.8, "static_load_kN": 22.6 }, { "sku": "61916-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 391, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6916ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61916-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61916-2RS for that.", "Shielded 61916-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6916ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 27.4/24 kN ratings, mass 391 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6916ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61916-ZZ bearing?", "a": "A 61916-ZZ deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61916-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61916-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6916ZZ — two non-contact steel shields (NSK suffix ZZ), 80×110×16 mm per ISO 15. Quoted values: C 27.4 kN, C0 24 kN, mass 391 g. The industry-neutral page spelling 61916-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61916", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6916ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71916", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6916ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6916ZZ", "material": "GCr15", "dynamic_load_kN": 27.4, "static_load_kN": 24 }, { "sku": "61917-2RS", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6917DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61917-2RS runs slower and cooler-limited than the open 61917; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61917-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61917-2RS.", "NSK catalogues the contact-sealed version as 6917DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 35/29.6 kN ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61917-2RS bearing?", "a": "A 61917-2RS deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61917 bore code work?", "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61917-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61917-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6917DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 85×120×18 mm per ISO 15. Quoted values: C 35 kN, C0 29.6 kN, mass 550 g. The industry-neutral page spelling 61917-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61917", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6917DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71917", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6917DDU" ], "locale_variants": {}, "manufacturer_designation": "NSK 6917DDU", "material": "GCr15", "dynamic_load_kN": 35, "static_load_kN": 29.6 }, { "sku": "61917-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6917VV", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 35, "static_load_kN": 29.6, "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61917-RSR run faster than contact-seal 61917-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61917-2RS instead.", "The non-contact lip of 61917-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61917-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6917VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 35/29.6 kN ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61917-RSR bearing?", "a": "A 61917-RSR deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61917 bore code work?", "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61917-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61917-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6917VV — two low-friction non-contact rubber seals (NSK suffix VV), 85×120×18 mm per ISO 15. Quoted values: C 35 kN, C0 29.6 kN, mass 550 g. The industry-neutral page spelling 61917-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61917", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6917VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71917", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6917VV" ], "locale_variants": {} }, { "sku": "61917-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6917ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61917-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61917-2RS for that.", "Shielded 61917-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6917ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 35/29.6 kN ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61917-ZZ bearing?", "a": "A 61917-ZZ deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61917 bore code work?", "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61917-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61917-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6917ZZ — two non-contact steel shields (NSK suffix ZZ), 85×120×18 mm per ISO 15. Quoted values: C 35 kN, C0 29.6 kN, mass 550 g. The industry-neutral page spelling 61917-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61917", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6917ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71917", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6917ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6917ZZ", "material": "GCr15", "dynamic_load_kN": 35, "static_load_kN": 29.6 }, { "sku": "61918-2RS", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 585, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6918DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61918-2RS runs slower and cooler-limited than the open 61918; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61918-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6918DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 36/31.5 kN ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61918-2RS bearing?", "a": "A 61918-2RS deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61918-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61918-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6918DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 90×125×18 mm per ISO 15. Quoted values: C 36 kN, C0 31.5 kN, mass 585 g. The industry-neutral page spelling 61918-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61918", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6918DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71918", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6918DDU" ], "locale_variants": {}, "manufacturer_designation": "NSK 6918DDU", "material": "GCr15", "dynamic_load_kN": 36, "static_load_kN": 31.5 }, { "sku": "61918-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6918VV", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 36, "static_load_kN": 31.5, "weight_g": 585, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61918-RSR run faster than contact-seal 61918-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61918-2RS instead.", "The non-contact lip of 61918-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6918VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 36/31.5 kN ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61918-RSR bearing?", "a": "A 61918-RSR deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61918-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61918-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6918VV — two low-friction non-contact rubber seals (NSK suffix VV), 90×125×18 mm per ISO 15. Quoted values: C 36 kN, C0 31.5 kN, mass 585 g. The industry-neutral page spelling 61918-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61918", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6918VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71918", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6918VV" ], "locale_variants": {} }, { "sku": "61918-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 585, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6918ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61918-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61918-2RS for that.", "Shielded 61918-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6918ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 36/31.5 kN ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61918-ZZ bearing?", "a": "A 61918-ZZ deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61918-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61918-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6918ZZ — two non-contact steel shields (NSK suffix ZZ), 90×125×18 mm per ISO 15. Quoted values: C 36 kN, C0 31.5 kN, mass 585 g. The industry-neutral page spelling 61918-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61918", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6918ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71918", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6918ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6918ZZ", "material": "GCr15", "dynamic_load_kN": 36, "static_load_kN": 31.5 }, { "sku": "61919-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6919VV", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 37, "static_load_kN": 33.5, "weight_g": 601, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61919-RSR run faster than contact-seal 61919-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61919-2RS instead.", "The non-contact lip of 61919-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6919VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 37/33.5 kN ratings, mass 601 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6919VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61919-RSR bearing?", "a": "A 61919-RSR deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61919-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61919-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6919VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×130×18 mm per ISO 15. Quoted values: C 37 kN, C0 33.5 kN, mass 601 g. The industry-neutral page spelling 61919-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61919", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6919VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71919", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6919VV" ], "locale_variants": {} }, { "sku": "61919-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 601, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6919ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61919-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61919-2RS for that.", "Shielded 61919-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61919-ZZ.", "NSK catalogues the shielded version as 6919ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 37/33.5 kN ratings, mass 601 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6919ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61919-ZZ bearing?", "a": "A 61919-ZZ deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61919-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61919-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6919ZZ — two non-contact steel shields (NSK suffix ZZ), 95×130×18 mm per ISO 15. Quoted values: C 37 kN, C0 33.5 kN, mass 601 g. The industry-neutral page spelling 61919-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61919", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6919ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71919", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6919ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6919ZZ", "material": "GCr15", "dynamic_load_kN": 37, "static_load_kN": 33.5 }, { "sku": "61920-2RS", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 828, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6920DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61920-2RS runs slower and cooler-limited than the open 61920; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61920-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the contact-sealed version as 6920DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 47/42 kN ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61920-2RS bearing?", "a": "A 61920-2RS deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61920-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61920-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6920DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 100×140×20 mm per ISO 15. Quoted values: C 47 kN, C0 42 kN, mass 828 g. The industry-neutral page spelling 61920-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61920", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6920DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71920", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6920DDU" ], "locale_variants": {}, "manufacturer_designation": "NSK 6920DDU", "material": "GCr15", "dynamic_load_kN": 47, "static_load_kN": 42 }, { "sku": "61920-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6920VV", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 47, "static_load_kN": 42, "weight_g": 828, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61920-RSR run faster than contact-seal 61920-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61920-2RS instead.", "The non-contact lip of 61920-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6920VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 47/42 kN ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61920-RSR bearing?", "a": "A 61920-RSR deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61920-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61920-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6920VV — two low-friction non-contact rubber seals (NSK suffix VV), 100×140×20 mm per ISO 15. Quoted values: C 47 kN, C0 42 kN, mass 828 g. The industry-neutral page spelling 61920-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61920", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6920VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71920", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6920VV" ], "locale_variants": {} }, { "sku": "61920-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 828, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6920ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61920-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61920-2RS for that.", "Shielded 61920-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6920ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 47/42 kN ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61920-ZZ bearing?", "a": "A 61920-ZZ deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61920-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61920-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6920ZZ — two non-contact steel shields (NSK suffix ZZ), 100×140×20 mm per ISO 15. Quoted values: C 47 kN, C0 42 kN, mass 828 g. The industry-neutral page spelling 61920-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61920", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6920ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71920", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6920ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6920ZZ", "material": "GCr15", "dynamic_load_kN": 47, "static_load_kN": 42 }, { "sku": "61921-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6921VV", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 46.5, "static_load_kN": 42, "weight_g": 856, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61921-RSR run faster than contact-seal 61921-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61921-2RS instead.", "The non-contact lip of 61921-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 145 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61921-RSR.", "NSK catalogues this low-friction non-contact seal as 6921VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 46.5/42 kN ratings, mass 856 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6921VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61921-RSR bearing?", "a": "A 61921-RSR deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61921-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61921-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6921VV — two low-friction non-contact rubber seals (NSK suffix VV), 105×145×20 mm per ISO 15. Quoted values: C 46.5 kN, C0 42 kN, mass 856 g. The industry-neutral page spelling 61921-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61921", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6921VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6921VV" ], "locale_variants": {} }, { "sku": "61921-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 856, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6921ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61921-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61921-2RS for that.", "Shielded 61921-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61921-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6921ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 46.5/42 kN ratings, mass 856 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6921ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61921-ZZ bearing?", "a": "A 61921-ZZ deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61921-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61921-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6921ZZ — two non-contact steel shields (NSK suffix ZZ), 105×145×20 mm per ISO 15. Quoted values: C 46.5 kN, C0 42 kN, mass 856 g. The industry-neutral page spelling 61921-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61921", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6921ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6921ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6921ZZ", "material": "GCr15", "dynamic_load_kN": 46.5, "static_load_kN": 42 }, { "sku": "61922-2RS", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 893, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6922DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61922-2RS runs slower and cooler-limited than the open 61922; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61922-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the contact-sealed version as 6922DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 48/44.5 kN ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61922-2RS bearing?", "a": "A 61922-2RS deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61922-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61922-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6922DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 110×150×20 mm per ISO 15. Quoted values: C 48 kN, C0 44.5 kN, mass 893 g. The industry-neutral page spelling 61922-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61922", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6922DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6922DDU" ], "locale_variants": {}, "manufacturer_designation": "NSK 6922DDU", "material": "GCr15", "dynamic_load_kN": 48, "static_load_kN": 44.5 }, { "sku": "61922-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6922VV", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48, "static_load_kN": 44.5, "weight_g": 893, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61922-RSR run faster than contact-seal 61922-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61922-2RS instead.", "The non-contact lip of 61922-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6922VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 48/44.5 kN ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61922-RSR bearing?", "a": "A 61922-RSR deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61922-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61922-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6922VV — two low-friction non-contact rubber seals (NSK suffix VV), 110×150×20 mm per ISO 15. Quoted values: C 48 kN, C0 44.5 kN, mass 893 g. The industry-neutral page spelling 61922-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61922", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6922VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6922VV" ], "locale_variants": {} }, { "sku": "61922-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 893, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6922ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61922-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61922-2RS for that.", "Shielded 61922-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6922ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 48/44.5 kN ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61922-ZZ bearing?", "a": "A 61922-ZZ deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61922-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61922-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6922ZZ — two non-contact steel shields (NSK suffix ZZ), 110×150×20 mm per ISO 15. Quoted values: C 48 kN, C0 44.5 kN, mass 893 g. The industry-neutral page spelling 61922-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61922", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6922ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6922ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6922ZZ", "material": "GCr15", "dynamic_load_kN": 48, "static_load_kN": 44.5 }, { "sku": "61924-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6924ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61924-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61924-2RS for that.", "Shielded 61924-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6924ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 58.5/54 kN ratings, mass 1210 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6924ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61924-ZZ bearing?", "a": "A 61924-ZZ deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61924 bore code work?", "a": "The last two digits of 61924 are bore code 24, giving 24 × 5 = 120 mm bore. The 165 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61924-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 120 mm bore?", "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61924-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6924ZZ — two non-contact steel shields (NSK suffix ZZ), 120×165×22 mm per ISO 15. Quoted values: C 58.5 kN, C0 54 kN, mass 1210 g. The industry-neutral page spelling 61924-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61924", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6924ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6924ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6924ZZ", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 54 }, { "sku": "61926-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1570, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6926ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 130 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61926-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61926-2RS for that.", "Shielded 61926-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6926ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 71.5/67.5 kN ratings, mass 1570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6926ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61926-ZZ bearing?", "a": "A 61926-ZZ deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61926 bore code work?", "a": "The last two digits of 61926 are bore code 26, giving 26 × 5 = 130 mm bore. The 180 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61926-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61926-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6926ZZ — two non-contact steel shields (NSK suffix ZZ), 130×180×24 mm per ISO 15. Quoted values: C 71.5 kN, C0 67.5 kN, mass 1570 g. The industry-neutral page spelling 61926-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61926", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6926ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6926ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6926ZZ", "material": "GCr15", "dynamic_load_kN": 71.5, "static_load_kN": 67.5 }, { "sku": "61928-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6928VV", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 73.5, "static_load_kN": 72, "weight_g": 1670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61928-RSR run faster than contact-seal 61928-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61928-2RS instead.", "The non-contact lip of 61928-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 140 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6928VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 73.5/72 kN ratings, mass 1670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6928VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61928-RSR bearing?", "a": "A 61928-RSR deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61928 bore code work?", "a": "The last two digits of 61928 are bore code 28, giving 28 × 5 = 140 mm bore. The 190 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61928-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61928-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6928VV — two low-friction non-contact rubber seals (NSK suffix VV), 140×190×24 mm per ISO 15. Quoted values: C 73.5 kN, C0 72 kN, mass 1670 g. The industry-neutral page spelling 61928-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61928", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6928VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6928VV" ], "locale_variants": {} }, { "sku": "61928-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6928ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61928-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61928-2RS for that.", "Shielded 61928-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6928ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 73.5/72 kN ratings, mass 1670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6928ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61928-ZZ bearing?", "a": "A 61928-ZZ deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61928 bore code work?", "a": "The last two digits of 61928 are bore code 28, giving 28 × 5 = 140 mm bore. The 190 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61928-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61928-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6928ZZ — two non-contact steel shields (NSK suffix ZZ), 140×190×24 mm per ISO 15. Quoted values: C 73.5 kN, C0 72 kN, mass 1670 g. The industry-neutral page spelling 61928-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61928", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6928ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6928ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6928ZZ", "material": "GCr15", "dynamic_load_kN": 73.5, "static_load_kN": 72 }, { "sku": "61930-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6930DDU", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93.5, "static_load_kN": 90.5, "weight_g": 3010, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 150 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61930-2RS runs slower and cooler-limited than the open 61930; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61930-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6930DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 93.5/90.5 kN ratings, mass 3010 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6930DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61930-2RS bearing?", "a": "A 61930-2RS deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61930 bore code work?", "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61930-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 150 mm bore?", "a": "619 is a thin section one step above 618: 210×28 mm with a 30.0 mm radial section at 150 mm bore; a 6230 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61930-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6930DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 150×210×28 mm per ISO 15. Quoted values: C 93.5 kN, C0 90.5 kN, mass 3010 g. The industry-neutral page spelling 61930-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61930", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6930DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6930DDU" ], "locale_variants": {} }, { "sku": "61930-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6930ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93.5, "static_load_kN": 90.5, "weight_g": 3010, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 150 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61930-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61930-2RS for that.", "Shielded 61930-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6930ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 93.5/90.5 kN ratings, mass 3010 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6930ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61930-ZZ bearing?", "a": "A 61930-ZZ deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61930 bore code work?", "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61930-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 150 mm bore?", "a": "619 is a thin section one step above 618: 210×28 mm with a 30.0 mm radial section at 150 mm bore; a 6230 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61930-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6930ZZ — two non-contact steel shields (NSK suffix ZZ), 150×210×28 mm per ISO 15. Quoted values: C 93.5 kN, C0 90.5 kN, mass 3010 g. The industry-neutral page spelling 61930-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61930", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6930ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6930ZZ" ], "locale_variants": {} }, { "sku": "61930", "brand": "NSK", "manufacturer_designation": "NSK 6930", "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": "steel", "dynamic_load_kN": 93.5, "static_load_kN": 90.5, "weight_g": 3010, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 150 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61930 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×210×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61930 units.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61930 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 93.5/90.5 kN ratings, mass 3010 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6930; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61930 bearing?", "a": "A 61930 deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61930 bore code work?", "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61930 mean?", "a": "A bare 61930 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 150 mm bore?", "a": "619 is a thin section one step above 618: 210×28 mm with a 30.0 mm radial section at 150 mm bore; a 6230 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61930?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6930 — the open (unsealed) execution, 150×210×28 mm per ISO 15. Quoted values: C 93.5 kN, C0 90.5 kN, mass 3010 g. The industry-neutral page spelling 61930 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61930", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6930" ], "locale_variants": {} }, { "sku": "61932-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6932DDU", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 95.5, "static_load_kN": 96, "weight_g": 2710, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61932-2RS runs slower and cooler-limited than the open 61932; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61932-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the contact-sealed version as 6932DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 95.5/96 kN ratings, mass 2710 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6932DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61932-2RS bearing?", "a": "A 61932-2RS deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61932 bore code work?", "a": "The last two digits of 61932 are bore code 32, giving 32 × 5 = 160 mm bore. The 220 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61932-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 160 mm bore?", "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61932-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6932DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 160×220×28 mm per ISO 15. Quoted values: C 95.5 kN, C0 96 kN, mass 2710 g. The industry-neutral page spelling 61932-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61932", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6932DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6932DDU" ], "locale_variants": {} }, { "sku": "61932-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6932ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 95.5, "static_load_kN": 96, "weight_g": 2710, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61932-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61932-2RS for that.", "Shielded 61932-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6932ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 95.5/96 kN ratings, mass 2710 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6932ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61932-ZZ bearing?", "a": "A 61932-ZZ deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61932 bore code work?", "a": "The last two digits of 61932 are bore code 32, giving 32 × 5 = 160 mm bore. The 220 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61932-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 160 mm bore?", "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61932-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6932ZZ — two non-contact steel shields (NSK suffix ZZ), 160×220×28 mm per ISO 15. Quoted values: C 95.5 kN, C0 96 kN, mass 2710 g. The industry-neutral page spelling 61932-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61932", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6932ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6932ZZ" ], "locale_variants": {} }, { "sku": "61934-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6934ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 170, "D_mm": 230, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 94.5, "static_load_kN": 97, "weight_g": 3340, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61934 carries bore code 34 = 170 mm. Outside diameter 230 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61934-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61934-2RS for that.", "Shielded 61934-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6934ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 94.5/97 kN ratings, mass 3340 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6934ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61934-ZZ bearing?", "a": "A 61934-ZZ deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61934 bore code work?", "a": "The last two digits of 61934 are bore code 34, giving 34 × 5 = 170 mm bore. The 230 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61934-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 170 mm bore?", "a": "619 is a thin section one step above 618: 230×28 mm with a 30.0 mm radial section at 170 mm bore; a 6234 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61934-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6934ZZ — two non-contact steel shields (NSK suffix ZZ), 170×230×28 mm per ISO 15. Quoted values: C 94.5 kN, C0 97 kN, mass 3340 g. The industry-neutral page spelling 61934-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61934", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6934ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6934ZZ" ], "locale_variants": {} }, { "sku": "61934", "brand": "NSK", "manufacturer_designation": "NSK 6934", "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": "steel", "dynamic_load_kN": 94.5, "static_load_kN": 97, "weight_g": 3340, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61934 carries bore code 34 = 170 mm. Outside diameter 230 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61934 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×230×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61934 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61934 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 94.5/97 kN ratings, mass 3340 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6934; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61934 bearing?", "a": "A 61934 deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61934 bore code work?", "a": "The last two digits of 61934 are bore code 34, giving 34 × 5 = 170 mm bore. The 230 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61934 mean?", "a": "A bare 61934 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 170 mm bore?", "a": "619 is a thin section one step above 618: 230×28 mm with a 30.0 mm radial section at 170 mm bore; a 6234 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61934?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6934 — the open (unsealed) execution, 170×230×28 mm per ISO 15. Quoted values: C 94.5 kN, C0 97 kN, mass 3340 g. The industry-neutral page spelling 61934 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61934", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6934" ], "locale_variants": {} }, { "sku": "61936-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6936ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 180, "D_mm": 250, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 131, "static_load_kN": 128, "weight_g": 4160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61936 carries bore code 36 = 180 mm. Outside diameter 250 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (35.0 mm section height at 180 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61936-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61936-2RS for that.", "Shielded 61936-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6936ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 131/128 kN ratings, mass 4160 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6936ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61936-ZZ bearing?", "a": "A 61936-ZZ deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61936 bore code work?", "a": "The last two digits of 61936 are bore code 36, giving 36 × 5 = 180 mm bore. The 250 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61936-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 180 mm bore?", "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61936-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6936ZZ — two non-contact steel shields (NSK suffix ZZ), 180×250×33 mm per ISO 15. Quoted values: C 131 kN, C0 128 kN, mass 4160 g. The industry-neutral page spelling 61936-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61936", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6936ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6936ZZ" ], "locale_variants": {} }, { "sku": "61940-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6940ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 200, "D_mm": 280, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 158, "static_load_kN": 158, "weight_g": 7280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61940 carries bore code 40 = 200 mm. Outside diameter 280 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 200 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61940-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61940-2RS for that.", "Shielded 61940-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6940ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 158/158 kN ratings, mass 7280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6940ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61940-ZZ bearing?", "a": "A 61940-ZZ deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61940 bore code work?", "a": "The last two digits of 61940 are bore code 40, giving 40 × 5 = 200 mm bore. The 280 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61940-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 200 mm bore?", "a": "619 is a thin section one step above 618: 280×38 mm with a 40.0 mm radial section at 200 mm bore; a 6240 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61940-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6940ZZ — two non-contact steel shields (NSK suffix ZZ), 200×280×38 mm per ISO 15. Quoted values: C 158 kN, C0 158 kN, mass 7280 g. The industry-neutral page spelling 61940-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61940", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6940ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6940ZZ" ], "locale_variants": {} }, { "sku": "61944-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6944ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 220, "D_mm": 300, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 161, "static_load_kN": 169, "weight_g": 7880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 220 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61944-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61944-2RS for that.", "Shielded 61944-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6944ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 161/169 kN ratings, mass 7880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6944ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61944-ZZ bearing?", "a": "A 61944-ZZ deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61944 bore code work?", "a": "The last two digits of 61944 are bore code 44, giving 44 × 5 = 220 mm bore. The 300 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61944-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 220 mm bore?", "a": "619 is a thin section one step above 618: 300×38 mm with a 40.0 mm radial section at 220 mm bore; a 6244 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61944-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6944ZZ — two non-contact steel shields (NSK suffix ZZ), 220×300×38 mm per ISO 15. Quoted values: C 161 kN, C0 169 kN, mass 7880 g. The industry-neutral page spelling 61944-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61944", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6944ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6944ZZ" ], "locale_variants": {} }, { "sku": "61948-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6948ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 240, "D_mm": 320, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 170, "static_load_kN": 190, "weight_g": 8490, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61948 carries bore code 48 = 240 mm. Outside diameter 320 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 240 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61948-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61948-2RS for that.", "Shielded 61948-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6948ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 170/190 kN ratings, mass 8490 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6948ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61948-ZZ bearing?", "a": "A 61948-ZZ deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61948 bore code work?", "a": "The last two digits of 61948 are bore code 48, giving 48 × 5 = 240 mm bore. The 320 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61948-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 240 mm bore?", "a": "619 is a thin section one step above 618: 320×38 mm with a 40.0 mm radial section at 240 mm bore; a 6248 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61948-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6948ZZ — two non-contact steel shields (NSK suffix ZZ), 240×320×38 mm per ISO 15. Quoted values: C 170 kN, C0 190 kN, mass 8490 g. The industry-neutral page spelling 61948-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61948", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6948ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6948ZZ" ], "locale_variants": {} }, { "sku": "6207-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6207VV", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.2, "static_load_kN": 15.3, "weight_g": 284, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6207-RSR run faster than contact-seal 6207-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6207-2RS instead.", "The non-contact lip of 6207-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6207-RSR.", "NSK catalogues this low-friction non-contact seal as 6207VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 28.2/15.3 kN ratings, mass 284 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6207VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6207-RSR bearing?", "a": "A 6207-RSR deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6207-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with a 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6207-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6207VV — two low-friction non-contact rubber seals (NSK suffix VV), 35×72×17 mm per ISO 15. Quoted values: C 28.2 kN, C0 15.3 kN, mass 284 g. The industry-neutral page spelling 6207-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6207", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7207", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207VV" ], "locale_variants": {} }, { "sku": "6209-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6209VV", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34.5, "static_load_kN": 20.4, "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6209-RSR run faster than contact-seal 6209-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6209-2RS instead.", "The non-contact lip of 6209-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6209-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6209VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 34.5/20.4 kN ratings, mass 420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6209VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6209-RSR bearing?", "a": "A 6209-RSR deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6209-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6209-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6209VV — two low-friction non-contact rubber seals (NSK suffix VV), 45×85×19 mm per ISO 15. Quoted values: C 34.5 kN, C0 20.4 kN, mass 420 g. The industry-neutral page spelling 6209-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6209", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7209", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209VV" ], "locale_variants": {} }, { "sku": "6210-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6210VV", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 38.5, "static_load_kN": 23.2, "weight_g": 459, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6210-RSR run faster than contact-seal 6210-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6210-2RS instead.", "The non-contact lip of 6210-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6210VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 38.5/23.2 kN ratings, mass 459 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6210VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6210-RSR bearing?", "a": "A 6210-RSR deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6210-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6210-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6210VV — two low-friction non-contact rubber seals (NSK suffix VV), 50×90×20 mm per ISO 15. Quoted values: C 38.5 kN, C0 23.2 kN, mass 459 g. The industry-neutral page spelling 6210-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6210", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7210", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210VV" ], "locale_variants": {} }, { "sku": "6211-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6211VV", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 47.5, "static_load_kN": 29.3, "weight_g": 619, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6211-RSR run faster than contact-seal 6211-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6211-2RS instead.", "The non-contact lip of 6211-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6211VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 47.5/29.3 kN ratings, mass 619 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6211VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6211-RSR bearing?", "a": "A 6211-RSR deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6211 bore code work?", "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6211-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6211-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6211VV — two low-friction non-contact rubber seals (NSK suffix VV), 55×100×21 mm per ISO 15. Quoted values: C 47.5 kN, C0 29.3 kN, mass 619 g. The industry-neutral page spelling 6211-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6211", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7211", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211VV" ], "locale_variants": {} }, { "sku": "6212-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6212VV", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 57.5, "static_load_kN": 36, "weight_g": 783, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6212-RSR run faster than contact-seal 6212-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6212-2RS instead.", "The non-contact lip of 6212-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6212VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 57.5/36 kN ratings, mass 783 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6212VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6212-RSR bearing?", "a": "A 6212-RSR deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6212-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6212-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6212VV — two low-friction non-contact rubber seals (NSK suffix VV), 60×110×22 mm per ISO 15. Quoted values: C 57.5 kN, C0 36 kN, mass 783 g. The industry-neutral page spelling 6212-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6212", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7212", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212VV" ], "locale_variants": {} }, { "sku": "6213-2RS", "brand": "NSK", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6213DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6213-2RS runs slower and cooler-limited than the open 6213; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6213-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the contact-sealed version as 6213DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 63/40 kN ratings, mass 1000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6213DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6213-2RS bearing?", "a": "A 6213-2RS deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6213-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6213-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6213DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 65×120×23 mm per ISO 15. Quoted values: C 63 kN, C0 40 kN, mass 1000 g. The industry-neutral page spelling 6213-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6213", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7213", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6213DDU" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6213DDU", "material": "GCr15", "dynamic_load_kN": 63, "static_load_kN": 40 }, { "sku": "6213-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6213VV", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 63, "static_load_kN": 40, "weight_g": 1000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6213-RSR run faster than contact-seal 6213-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6213-2RS instead.", "The non-contact lip of 6213-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6213-RSR.", "NSK catalogues this low-friction non-contact seal as 6213VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 63/40 kN ratings, mass 1000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6213VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6213-RSR bearing?", "a": "A 6213-RSR deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6213-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6213-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6213VV — two low-friction non-contact rubber seals (NSK suffix VV), 65×120×23 mm per ISO 15. Quoted values: C 63 kN, C0 40 kN, mass 1000 g. The industry-neutral page spelling 6213-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6213", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7213", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6213VV" ], "locale_variants": {} }, { "sku": "6214-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6214VV", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68.5, "static_load_kN": 44, "weight_g": 1090, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6214-RSR run faster than contact-seal 6214-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6214-2RS instead.", "The non-contact lip of 6214-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6214VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 68.5/44 kN ratings, mass 1090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6214VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6214-RSR bearing?", "a": "A 6214-RSR deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6214-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6214-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6214VV — two low-friction non-contact rubber seals (NSK suffix VV), 70×125×24 mm per ISO 15. Quoted values: C 68.5 kN, C0 44 kN, mass 1090 g. The industry-neutral page spelling 6214-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6214", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7214", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214VV" ], "locale_variants": {} }, { "sku": "6215-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6215VV", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 73, "static_load_kN": 49.5, "weight_g": 1190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6215-RSR run faster than contact-seal 6215-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6215-2RS instead.", "The non-contact lip of 6215-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6215-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6215VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 73/49.5 kN ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6215VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6215-RSR bearing?", "a": "A 6215-RSR deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6215-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6215-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6215VV — two low-friction non-contact rubber seals (NSK suffix VV), 75×130×25 mm per ISO 15. Quoted values: C 73 kN, C0 49.5 kN, mass 1190 g. The industry-neutral page spelling 6215-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6215", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7215", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215VV" ], "locale_variants": {} }, { "sku": "6216-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6216VV", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 53, "weight_g": 1420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6216-RSR run faster than contact-seal 6216-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6216-2RS instead.", "The non-contact lip of 6216-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6216VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 80/53 kN ratings, mass 1420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6216VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6216-RSR bearing?", "a": "A 6216-RSR deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6216-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6216-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6216VV — two low-friction non-contact rubber seals (NSK suffix VV), 80×140×26 mm per ISO 15. Quoted values: C 80 kN, C0 53 kN, mass 1420 g. The industry-neutral page spelling 6216-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6216", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7216", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216VV" ], "locale_variants": {} }, { "sku": "6217-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6217VV", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 92.5, "static_load_kN": 62, "weight_g": 1760, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6217-RSR run faster than contact-seal 6217-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6217-2RS instead.", "The non-contact lip of 6217-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6217VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 92.5/62 kN ratings, mass 1760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6217VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6217-RSR bearing?", "a": "A 6217-RSR deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6217-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6217-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6217VV — two low-friction non-contact rubber seals (NSK suffix VV), 85×150×28 mm per ISO 15. Quoted values: C 92.5 kN, C0 62 kN, mass 1760 g. The industry-neutral page spelling 6217-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6217", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7217", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217VV" ], "locale_variants": {} }, { "sku": "6218-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6218VV", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 71.5, "weight_g": 2180, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6218-RSR run faster than contact-seal 6218-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6218-2RS instead.", "The non-contact lip of 6218-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6218VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 106/71.5 kN ratings, mass 2180 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6218VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6218-RSR bearing?", "a": "A 6218-RSR deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6218-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6218-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6218VV — two low-friction non-contact rubber seals (NSK suffix VV), 90×160×30 mm per ISO 15. Quoted values: C 106 kN, C0 71.5 kN, mass 2180 g. The industry-neutral page spelling 6218-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6218", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7218", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218VV" ], "locale_variants": {} }, { "sku": "6219-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6219VV", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 120, "static_load_kN": 82, "weight_g": 2640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6219-RSR run faster than contact-seal 6219-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6219-2RS instead.", "The non-contact lip of 6219-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6219-RSR.", "NSK catalogues this low-friction non-contact seal as 6219VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 120/82 kN ratings, mass 2640 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6219VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6219-RSR bearing?", "a": "A 6219-RSR deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6219-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6219-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6219VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×170×32 mm per ISO 15. Quoted values: C 120 kN, C0 82 kN, mass 2640 g. The industry-neutral page spelling 6219-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6219", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7219", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219VV" ], "locale_variants": {} }, { "sku": "6220-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6220VV", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 93, "weight_g": 3170, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6220-RSR run faster than contact-seal 6220-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6220-2RS instead.", "The non-contact lip of 6220-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6220VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 134/93 kN ratings, mass 3170 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6220VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6220-RSR bearing?", "a": "A 6220-RSR deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6220 bore code work?", "a": "The last two digits of 6220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6220-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6220-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6220VV — two low-friction non-contact rubber seals (NSK suffix VV), 100×180×34 mm per ISO 15. Quoted values: C 134 kN, C0 93 kN, mass 3170 g. The industry-neutral page spelling 6220-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6220", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7220", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220VV" ], "locale_variants": {} }, { "sku": "6221-2RS", "brand": "NSK", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3790, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6221DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6221-2RS runs slower and cooler-limited than the open 6221; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6221-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6221-2RS.", "NSK catalogues the contact-sealed version as 6221DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 146/105 kN ratings, mass 3790 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6221DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6221-2RS bearing?", "a": "A 6221-2RS deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6221-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6221-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6221DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 105×190×36 mm per ISO 15. Quoted values: C 146 kN, C0 105 kN, mass 3790 g. The industry-neutral page spelling 6221-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6221", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7221", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6221DDU" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6221DDU", "material": "GCr15", "dynamic_load_kN": 146, "static_load_kN": 105 }, { "sku": "6221-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6221VV", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 146, "static_load_kN": 105, "weight_g": 3790, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6221-RSR run faster than contact-seal 6221-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6221-2RS instead.", "The non-contact lip of 6221-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6221-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6221VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 146/105 kN ratings, mass 3790 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6221VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6221-RSR bearing?", "a": "A 6221-RSR deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6221-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6221-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6221VV — two low-friction non-contact rubber seals (NSK suffix VV), 105×190×36 mm per ISO 15. Quoted values: C 146 kN, C0 105 kN, mass 3790 g. The industry-neutral page spelling 6221-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6221", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7221", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6221VV" ], "locale_variants": {} }, { "sku": "6222-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6222VV", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 159, "static_load_kN": 117, "weight_g": 4450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6222-RSR run faster than contact-seal 6222-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6222-2RS instead.", "The non-contact lip of 6222-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6222VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 159/117 kN ratings, mass 4450 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6222VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6222-RSR bearing?", "a": "A 6222-RSR deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6222-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6222-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6222VV — two low-friction non-contact rubber seals (NSK suffix VV), 110×200×38 mm per ISO 15. Quoted values: C 159 kN, C0 117 kN, mass 4450 g. The industry-neutral page spelling 6222-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6222", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7222", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222VV" ], "locale_variants": {} }, { "sku": "6224-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6224VV", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 171, "static_load_kN": 131, "weight_g": 5290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6224-RSR run faster than contact-seal 6224-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6224-2RS instead.", "The non-contact lip of 6224-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6224VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 171/131 kN ratings, mass 5290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6224VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6224-RSR bearing?", "a": "A 6224-RSR deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6224-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6224-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6224VV — two low-friction non-contact rubber seals (NSK suffix VV), 120×215×40 mm per ISO 15. Quoted values: C 171 kN, C0 131 kN, mass 5290 g. The industry-neutral page spelling 6224-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6224", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224VV" ], "locale_variants": {} }, { "sku": "6228-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6228DDU", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 183, "static_load_kN": 150, "weight_g": 7680, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6228-2RS runs slower and cooler-limited than the open 6228; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6228-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6228DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 183/150 kN ratings, mass 7680 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6228DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6228-2RS bearing?", "a": "A 6228-2RS deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6228 bore code work?", "a": "The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6228-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6228-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6228DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 140×250×42 mm per ISO 15. Quoted values: C 183 kN, C0 150 kN, mass 7680 g. The industry-neutral page spelling 6228-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6228", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6228DDU" ], "locale_variants": {} }, { "sku": "6228-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6228ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 183, "static_load_kN": 150, "weight_g": 7680, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6228-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6228-2RS for that.", "Shielded 6228-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6228ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 183/150 kN ratings, mass 7680 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6228ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6228-ZZ bearing?", "a": "A 6228-ZZ deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6228 bore code work?", "a": "The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6228-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6228-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6228ZZ — two non-contact steel shields (NSK suffix ZZ), 140×250×42 mm per ISO 15. Quoted values: C 183 kN, C0 150 kN, mass 7680 g. The industry-neutral page spelling 6228-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6228", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6228ZZ" ], "locale_variants": {} }, { "sku": "6230-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6230ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 194, "static_load_kN": 168, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6230-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6230-2RS for that.", "Shielded 6230-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6230ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 194/168 kN ratings, mass 10000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6230ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6230-ZZ bearing?", "a": "A 6230-ZZ deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6230 bore code work?", "a": "The last two digits of 6230 are bore code 30, giving 30 × 5 = 150 mm bore. The 270 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6230-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6230-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6230ZZ — two non-contact steel shields (NSK suffix ZZ), 150×270×45 mm per ISO 15. Quoted values: C 194 kN, C0 168 kN, mass 10000 g. The industry-neutral page spelling 6230-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6230", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6230ZZ" ], "locale_variants": {} }, { "sku": "6232-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6232ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 160, "D_mm": 290, "B_mm": 48, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 204, "static_load_kN": 186, "weight_g": 12800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6232 carries bore code 32 = 160 mm. Outside diameter 290 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 160 mm bore; before upgrading to a 6332 for extra capacity, confirm the housing accepts a 290 mm OD and 48 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6232-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6232-2RS for that.", "Shielded 6232-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6232ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 204/186 kN ratings, mass 12800 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6232ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6232-ZZ bearing?", "a": "A 6232-ZZ deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6232 bore code work?", "a": "The last two digits of 6232 are bore code 32, giving 32 × 5 = 160 mm bore. The 290 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6232-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 160 mm bore?", "a": "The '2' is the light diameter series: 290×48 mm with a 65.0 mm radial section at 160 mm bore. A 6332 on the same bore is larger and higher-rated; a 6032 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6232-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6232ZZ — two non-contact steel shields (NSK suffix ZZ), 160×290×48 mm per ISO 15. Quoted values: C 204 kN, C0 186 kN, mass 12800 g. The industry-neutral page spelling 6232-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6232", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6232ZZ" ], "locale_variants": {} }, { "sku": "6234-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6234ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 170, "D_mm": 310, "B_mm": 52, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 234, "static_load_kN": 224, "weight_g": 15800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6234 carries bore code 34 = 170 mm. Outside diameter 310 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 170 mm bore; before upgrading to a 6334 for extra capacity, confirm the housing accepts a 310 mm OD and 52 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6234-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6234-2RS for that.", "Shielded 6234-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6234ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 234/224 kN ratings, mass 15800 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6234ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6234-ZZ bearing?", "a": "A 6234-ZZ deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6234 bore code work?", "a": "The last two digits of 6234 are bore code 34, giving 34 × 5 = 170 mm bore. The 310 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6234-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 170 mm bore?", "a": "The '2' is the light diameter series: 310×52 mm with a 70.0 mm radial section at 170 mm bore. A 6334 on the same bore is larger and higher-rated; a 6034 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6234-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6234ZZ — two non-contact steel shields (NSK suffix ZZ), 170×310×52 mm per ISO 15. Quoted values: C 234 kN, C0 224 kN, mass 15800 g. The industry-neutral page spelling 6234-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6234", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6234ZZ" ], "locale_variants": {} }, { "sku": "6236-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6236ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 180, "D_mm": 320, "B_mm": 52, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 250, "static_load_kN": 241, "weight_g": 15900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6236 carries bore code 36 = 180 mm. Outside diameter 320 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 180 mm bore; before upgrading to a 6336 for extra capacity, confirm the housing accepts a 320 mm OD and 52 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6236-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6236-2RS for that.", "Shielded 6236-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6236ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 250/241 kN ratings, mass 15900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6236ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6236-ZZ bearing?", "a": "A 6236-ZZ deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6236 bore code work?", "a": "The last two digits of 6236 are bore code 36, giving 36 × 5 = 180 mm bore. The 320 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6236-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 180 mm bore?", "a": "The '2' is the light diameter series: 320×52 mm with a 70.0 mm radial section at 180 mm bore. A 6336 on the same bore is larger and higher-rated; a 6036 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6236-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6236ZZ — two non-contact steel shields (NSK suffix ZZ), 180×320×52 mm per ISO 15. Quoted values: C 250 kN, C0 241 kN, mass 15900 g. The industry-neutral page spelling 6236-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6236", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6236ZZ" ], "locale_variants": {} }, { "sku": "6238-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6238ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 190, "D_mm": 340, "B_mm": 55, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 280, "static_load_kN": 282, "weight_g": 22300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6238 carries bore code 38 = 190 mm. Outside diameter 340 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 190 mm bore; before upgrading to a 6338 for extra capacity, confirm the housing accepts a 340 mm OD and 55 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6238-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6238-2RS for that.", "Shielded 6238-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 190 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6238ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 280/282 kN ratings, mass 22300 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6238ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6238-ZZ bearing?", "a": "A 6238-ZZ deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6238 bore code work?", "a": "The last two digits of 6238 are bore code 38, giving 38 × 5 = 190 mm bore. The 340 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6238-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 190 mm bore?", "a": "The '2' is the light diameter series: 340×55 mm with a 75.0 mm radial section at 190 mm bore. A 6338 on the same bore is larger and higher-rated; a 6038 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6238-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6238ZZ — two non-contact steel shields (NSK suffix ZZ), 190×340×55 mm per ISO 15. Quoted values: C 280 kN, C0 282 kN, mass 22300 g. The industry-neutral page spelling 6238-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6238", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6238ZZ" ], "locale_variants": {} }, { "sku": "6240-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6240ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 200, "D_mm": 360, "B_mm": 58, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 296, "static_load_kN": 310, "weight_g": 26700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6240 carries bore code 40 = 200 mm. Outside diameter 360 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 200 mm bore; before upgrading to a 6340 for extra capacity, confirm the housing accepts a 360 mm OD and 58 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6240-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6240-2RS for that.", "Shielded 6240-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6240ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 296/310 kN ratings, mass 26700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6240ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6240-ZZ bearing?", "a": "A 6240-ZZ deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6240 bore code work?", "a": "The last two digits of 6240 are bore code 40, giving 40 × 5 = 200 mm bore. The 360 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6240-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 200 mm bore?", "a": "The '2' is the light diameter series: 360×58 mm with a 80.0 mm radial section at 200 mm bore. A 6340 on the same bore is larger and higher-rated; a 6040 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6240-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6240ZZ — two non-contact steel shields (NSK suffix ZZ), 200×360×58 mm per ISO 15. Quoted values: C 296 kN, C0 310 kN, mass 26700 g. The industry-neutral page spelling 6240-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6240", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6240ZZ" ], "locale_variants": {} }, { "sku": "6248", "brand": "NSK", "manufacturer_designation": "NSK 6248", "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": "steel", "dynamic_load_kN": 375, "static_load_kN": 430, "weight_g": 50500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6248 carries bore code 48 = 240 mm. Outside diameter 440 mm and width 72 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 240 mm bore; before upgrading to a 6348 for extra capacity, confirm the housing accepts a 440 mm OD and 72 mm width — it is not a drop-in swap.", "The open 6248 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×440×72 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6248 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6248 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 375/430 kN ratings, mass 50500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6248; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6248 bearing?", "a": "A 6248 deep-groove ball bearing has a 240 mm bore, 440 mm outer diameter and 72 mm width (9.449 × 17.323 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6248 bore code work?", "a": "The last two digits of 6248 are bore code 48, giving 48 × 5 = 240 mm bore. The 440 mm outside diameter and 72 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6248 mean?", "a": "A bare 6248 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 240 mm bore?", "a": "The '2' is the light diameter series: 440×72 mm with a 100.0 mm radial section at 240 mm bore. A 6348 on the same bore is larger and higher-rated; a 6048 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6248?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6248 — the open (unsealed) execution, 240×440×72 mm per ISO 15. Quoted values: C 375 kN, C0 430 kN, mass 50500 g. The industry-neutral page spelling 6248 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6248", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6303-2RS", "brand": "NSK", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 113, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6303DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "Contact seals add drag and heat: 6303-2RS runs slower and cooler-limited than the open 6303; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6303-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6303DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 15/6.65 kN ratings, mass 113 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6303DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6303-2RS bearing?", "a": "A 6303-2RS deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6303-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6303-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6303DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 17×47×14 mm per ISO 15. Quoted values: C 15 kN, C0 6.65 kN, mass 113 g. The industry-neutral page spelling 6303-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7303", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303DDU" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6303DDU", "material": "GCr15", "dynamic_load_kN": 15, "static_load_kN": 6.65 }, { "sku": "6307-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6307VV", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 36.5, "static_load_kN": 19.2, "weight_g": 464, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "RSR low-friction seals on 6307-RSR run faster than contact-seal 6307-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6307-2RS instead.", "The non-contact lip of 6307-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6307VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 36.5/19.2 kN ratings, mass 464 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6307VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6307-RSR bearing?", "a": "A 6307-RSR deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6307 bore code work?", "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6307-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6307-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6307VV — two low-friction non-contact rubber seals (NSK suffix VV), 35×80×21 mm per ISO 15. Quoted values: C 36.5 kN, C0 19.2 kN, mass 464 g. The industry-neutral page spelling 6307-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6307", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7307", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307VV" ], "locale_variants": {} }, { "sku": "6309-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6309VV", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 58.5, "static_load_kN": 32, "weight_g": 829, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "RSR low-friction seals on 6309-RSR run faster than contact-seal 6309-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6309-2RS instead.", "The non-contact lip of 6309-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6309VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 58.5/32 kN ratings, mass 829 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6309VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6309-RSR bearing?", "a": "A 6309-RSR deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6309-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6309-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6309VV — two low-friction non-contact rubber seals (NSK suffix VV), 45×100×25 mm per ISO 15. Quoted values: C 58.5 kN, C0 32 kN, mass 829 g. The industry-neutral page spelling 6309-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6309", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7309", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309VV" ], "locale_variants": {} }, { "sku": "6310-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6310VV", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68, "static_load_kN": 38.5, "weight_g": 1060, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "RSR low-friction seals on 6310-RSR run faster than contact-seal 6310-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6310-2RS instead.", "The non-contact lip of 6310-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6310VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 68/38.5 kN ratings, mass 1060 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6310VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6310-RSR bearing?", "a": "A 6310-RSR deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6310-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 50 mm bore?", "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6310-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6310VV — two low-friction non-contact rubber seals (NSK suffix VV), 50×110×27 mm per ISO 15. Quoted values: C 68 kN, C0 38.5 kN, mass 1060 g. The industry-neutral page spelling 6310-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6310", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310VV" ], "locale_variants": {} }, { "sku": "6311-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6311VV", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 78.5, "static_load_kN": 44.5, "weight_g": 1370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "RSR low-friction seals on 6311-RSR run faster than contact-seal 6311-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6311-2RS instead.", "The non-contact lip of 6311-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6311VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 78.5/44.5 kN ratings, mass 1370 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6311VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6311-RSR bearing?", "a": "A 6311-RSR deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6311-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6311-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6311VV — two low-friction non-contact rubber seals (NSK suffix VV), 55×120×29 mm per ISO 15. Quoted values: C 78.5 kN, C0 44.5 kN, mass 1370 g. The industry-neutral page spelling 6311-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6311", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311VV" ], "locale_variants": {} }, { "sku": "6312-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6312VV", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 90, "static_load_kN": 52, "weight_g": 1720, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "RSR low-friction seals on 6312-RSR run faster than contact-seal 6312-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6312-2RS instead.", "The non-contact lip of 6312-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6312-RSR.", "NSK catalogues this low-friction non-contact seal as 6312VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 90/52 kN ratings, mass 1720 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6312VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6312-RSR bearing?", "a": "A 6312-RSR deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6312-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6312-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6312VV — two low-friction non-contact rubber seals (NSK suffix VV), 60×130×31 mm per ISO 15. Quoted values: C 90 kN, C0 52 kN, mass 1720 g. The industry-neutral page spelling 6312-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6312", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312VV" ], "locale_variants": {} }, { "sku": "6313-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6313VV", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 102, "static_load_kN": 60, "weight_g": 2110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "RSR low-friction seals on 6313-RSR run faster than contact-seal 6313-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6313-2RS instead.", "The non-contact lip of 6313-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6313VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 102/60 kN ratings, mass 2110 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6313VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6313-RSR bearing?", "a": "A 6313-RSR deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6313-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6313-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6313VV — two low-friction non-contact rubber seals (NSK suffix VV), 65×140×33 mm per ISO 15. Quoted values: C 102 kN, C0 60 kN, mass 2110 g. The industry-neutral page spelling 6313-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6313", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313VV" ], "locale_variants": {} }, { "sku": "6314-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6314VV", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 115, "static_load_kN": 68, "weight_g": 2570, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "RSR low-friction seals on 6314-RSR run faster than contact-seal 6314-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6314-2RS instead.", "The non-contact lip of 6314-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6314VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 115/68 kN ratings, mass 2570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6314VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6314-RSR bearing?", "a": "A 6314-RSR deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6314-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6314-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6314VV — two low-friction non-contact rubber seals (NSK suffix VV), 70×150×35 mm per ISO 15. Quoted values: C 115 kN, C0 68 kN, mass 2570 g. The industry-neutral page spelling 6314-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6314", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314VV" ], "locale_variants": {} }, { "sku": "6315-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6315VV", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 125, "static_load_kN": 77, "weight_g": 3080, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "RSR low-friction seals on 6315-RSR run faster than contact-seal 6315-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6315-2RS instead.", "The non-contact lip of 6315-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6315VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 125/77 kN ratings, mass 3080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6315VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6315-RSR bearing?", "a": "A 6315-RSR deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6315 bore code work?", "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6315-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6315-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6315VV — two low-friction non-contact rubber seals (NSK suffix VV), 75×160×37 mm per ISO 15. Quoted values: C 125 kN, C0 77 kN, mass 3080 g. The industry-neutral page spelling 6315-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6315", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315VV" ], "locale_variants": {} }, { "sku": "6316-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6316VV", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 135, "static_load_kN": 86.5, "weight_g": 3670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "RSR low-friction seals on 6316-RSR run faster than contact-seal 6316-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6316-2RS instead.", "The non-contact lip of 6316-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 39 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6316VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 135/86.5 kN ratings, mass 3670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6316VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6316-RSR bearing?", "a": "A 6316-RSR deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6316-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6316-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6316VV — two low-friction non-contact rubber seals (NSK suffix VV), 80×170×39 mm per ISO 15. Quoted values: C 135 kN, C0 86.5 kN, mass 3670 g. The industry-neutral page spelling 6316-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6316", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316VV" ], "locale_variants": {} }, { "sku": "6317-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6317VV", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 146, "static_load_kN": 97, "weight_g": 4280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "RSR low-friction seals on 6317-RSR run faster than contact-seal 6317-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6317-2RS instead.", "The non-contact lip of 6317-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6317VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 146/97 kN ratings, mass 4280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6317VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6317-RSR bearing?", "a": "A 6317-RSR deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6317-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6317-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6317VV — two low-friction non-contact rubber seals (NSK suffix VV), 85×180×41 mm per ISO 15. Quoted values: C 146 kN, C0 97 kN, mass 4280 g. The industry-neutral page spelling 6317-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6317", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317VV" ], "locale_variants": {} }, { "sku": "6318-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6318VV", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 157, "static_load_kN": 107, "weight_g": 4980, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "RSR low-friction seals on 6318-RSR run faster than contact-seal 6318-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6318-2RS instead.", "The non-contact lip of 6318-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6318-RSR.", "NSK catalogues this low-friction non-contact seal as 6318VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 157/107 kN ratings, mass 4980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6318VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6318-RSR bearing?", "a": "A 6318-RSR deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6318-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6318-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6318VV — two low-friction non-contact rubber seals (NSK suffix VV), 90×190×43 mm per ISO 15. Quoted values: C 157 kN, C0 107 kN, mass 4980 g. The industry-neutral page spelling 6318-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6318", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318VV" ], "locale_variants": {} }, { "sku": "6319-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6319VV", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 168, "static_load_kN": 119, "weight_g": 5760, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "RSR low-friction seals on 6319-RSR run faster than contact-seal 6319-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6319-2RS instead.", "The non-contact lip of 6319-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6319VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 168/119 kN ratings, mass 5760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6319VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6319-RSR bearing?", "a": "A 6319-RSR deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6319-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6319-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6319VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×200×45 mm per ISO 15. Quoted values: C 168 kN, C0 119 kN, mass 5760 g. The industry-neutral page spelling 6319-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6319", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319VV" ], "locale_variants": {} }, { "sku": "6320-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6320VV", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 191, "static_load_kN": 141, "weight_g": 7040, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "RSR low-friction seals on 6320-RSR run faster than contact-seal 6320-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6320-2RS instead.", "The non-contact lip of 6320-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6320-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6320VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 191/141 kN ratings, mass 7040 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6320VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6320-RSR bearing?", "a": "A 6320-RSR deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6320-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6320-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6320VV — two low-friction non-contact rubber seals (NSK suffix VV), 100×215×47 mm per ISO 15. Quoted values: C 191 kN, C0 141 kN, mass 7040 g. The industry-neutral page spelling 6320-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320VV" ], "locale_variants": {} }, { "sku": "6320", "brand": "NSK", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7040, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), VV (non-contact seals) and DDU (contact seals).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "The open 6320 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×215×47 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6320 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6320-C3. No clearance suffix means normal CN clearance.", "The open 6320 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 191/141 kN ratings, mass 7040 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6320; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6320 bearing?", "a": "A 6320 deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6320 mean?", "a": "A bare 6320 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6320?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6320 — the open (unsealed) execution, 100×215×47 mm per ISO 15. Quoted values: C 191 kN, C0 141 kN, mass 7040 g. The industry-neutral page spelling 6320 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6320", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." }, { "equiv_sku": "7320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6320", "material": "GCr15", "dynamic_load_kN": 191, "static_load_kN": 141 }, { "sku": "6321-2RS", "brand": "NSK", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8090, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6321DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "Contact seals add drag and heat: 6321-2RS runs slower and cooler-limited than the open 6321; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6321-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6321DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 202/154 kN ratings, mass 8090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6321DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6321-2RS bearing?", "a": "A 6321-2RS deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6321-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6321-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6321DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 105×225×49 mm per ISO 15. Quoted values: C 202 kN, C0 154 kN, mass 8090 g. The industry-neutral page spelling 6321-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6321", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7321", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6321DDU" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6321DDU", "material": "GCr15", "dynamic_load_kN": 202, "static_load_kN": 154 }, { "sku": "6322-ZZ", "brand": "NSK", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 9510, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6322ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "ZZ shields are non-contact: 6322-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6322-2RS for that.", "Shielded 6322-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6322-ZZ.", "NSK catalogues the shielded version as 6322ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 226/179 kN ratings, mass 9510 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6322ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6322-ZZ bearing?", "a": "A 6322-ZZ deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6322-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 110 mm bore?", "a": "The '3' is the medium diameter series: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 6222 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6322-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6322ZZ — two non-contact steel shields (NSK suffix ZZ), 110×240×50 mm per ISO 15. Quoted values: C 226 kN, C0 179 kN, mass 9510 g. The industry-neutral page spelling 6322-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6322", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7322", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21322", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6322ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6322ZZ", "material": "GCr15", "dynamic_load_kN": 226, "static_load_kN": 179 }, { "sku": "6326-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6326ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 252, "static_load_kN": 214, "weight_g": 15200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6326 carries bore code 26 = 130 mm. Outside diameter 280 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 130 mm bore through a 280 mm OD and 58 mm width; the heavier rolling elements also trade away some speed versus a 6226.", "ZZ shields are non-contact: 6326-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6326-2RS for that.", "Shielded 6326-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 58 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6326ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 252/214 kN ratings, mass 15200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6326ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6326-ZZ bearing?", "a": "A 6326-ZZ deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6326 bore code work?", "a": "The last two digits of 6326 are bore code 26, giving 26 × 5 = 130 mm bore. The 280 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6326-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 130 mm bore?", "a": "The '3' is the medium diameter series: 280×58 mm, 75.0 mm radial section at 130 mm bore, carrying more load than a 6226 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6326-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6326ZZ — two non-contact steel shields (NSK suffix ZZ), 130×280×58 mm per ISO 15. Quoted values: C 252 kN, C0 214 kN, mass 15200 g. The industry-neutral page spelling 6326-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6326", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6326ZZ" ], "locale_variants": {} }, { "sku": "6328-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6328ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 278, "static_load_kN": 246, "weight_g": 18500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6328 carries bore code 28 = 140 mm. Outside diameter 300 mm and width 62 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 140 mm bore through a 300 mm OD and 62 mm width; the heavier rolling elements also trade away some speed versus a 6228.", "ZZ shields are non-contact: 6328-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6328-2RS for that.", "Shielded 6328-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 300 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6328-ZZ.", "NSK catalogues the shielded version as 6328ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 278/246 kN ratings, mass 18500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6328ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6328-ZZ bearing?", "a": "A 6328-ZZ deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6328 bore code work?", "a": "The last two digits of 6328 are bore code 28, giving 28 × 5 = 140 mm bore. The 300 mm outside diameter and 62 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6328-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 140 mm bore?", "a": "The '3' is the medium diameter series: 300×62 mm, 80.0 mm radial section at 140 mm bore, carrying more load than a 6228 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6328-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6328ZZ — two non-contact steel shields (NSK suffix ZZ), 140×300×62 mm per ISO 15. Quoted values: C 278 kN, C0 246 kN, mass 18500 g. The industry-neutral page spelling 6328-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6328", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6328ZZ" ], "locale_variants": {} }, { "sku": "6330-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6330ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 300, "static_load_kN": 284, "weight_g": 22700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6330 carries bore code 30 = 150 mm. Outside diameter 320 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 150 mm bore through a 320 mm OD and 65 mm width; the heavier rolling elements also trade away some speed versus a 6230.", "ZZ shields are non-contact: 6330-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6330-2RS for that.", "Shielded 6330-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6330-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6330ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 300/284 kN ratings, mass 22700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6330ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6330-ZZ bearing?", "a": "A 6330-ZZ deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6330 bore code work?", "a": "The last two digits of 6330 are bore code 30, giving 30 × 5 = 150 mm bore. The 320 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6330-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 150 mm bore?", "a": "The '3' is the medium diameter series: 320×65 mm, 85.0 mm radial section at 150 mm bore, carrying more load than a 6230 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6330-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6330ZZ — two non-contact steel shields (NSK suffix ZZ), 150×320×65 mm per ISO 15. Quoted values: C 300 kN, C0 284 kN, mass 22700 g. The industry-neutral page spelling 6330-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6330", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6330ZZ" ], "locale_variants": {} }, { "sku": "6332-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6332ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 160, "D_mm": 340, "B_mm": 68, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 305, "static_load_kN": 287, "weight_g": 26200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6332 carries bore code 32 = 160 mm. Outside diameter 340 mm and width 68 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 160 mm bore through a 340 mm OD and 68 mm width; the heavier rolling elements also trade away some speed versus a 6232.", "ZZ shields are non-contact: 6332-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6332-2RS for that.", "Shielded 6332-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 68 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6332ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 305/287 kN ratings, mass 26200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6332ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6332-ZZ bearing?", "a": "A 6332-ZZ deep-groove ball bearing has a 160 mm bore, 340 mm outer diameter and 68 mm width (6.299 × 13.386 × 2.677 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6332 bore code work?", "a": "The last two digits of 6332 are bore code 32, giving 32 × 5 = 160 mm bore. The 340 mm outside diameter and 68 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6332-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 160 mm bore?", "a": "The '3' is the medium diameter series: 340×68 mm, 90.0 mm radial section at 160 mm bore, carrying more load than a 6232 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6332-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6332ZZ — two non-contact steel shields (NSK suffix ZZ), 160×340×68 mm per ISO 15. Quoted values: C 305 kN, C0 287 kN, mass 26200 g. The industry-neutral page spelling 6332-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6332", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6332ZZ" ], "locale_variants": {} }, { "sku": "6332", "brand": "NSK", "manufacturer_designation": "NSK 6332", "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": "steel", "dynamic_load_kN": 305, "static_load_kN": 287, "weight_g": 26200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6332 carries bore code 32 = 160 mm. Outside diameter 340 mm and width 68 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 160 mm bore through a 340 mm OD and 68 mm width; the heavier rolling elements also trade away some speed versus a 6232.", "The open 6332 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×340×68 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6332 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6332-C3. No clearance suffix means normal CN clearance.", "The open 6332 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 305/287 kN ratings, mass 26200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6332; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6332 bearing?", "a": "A 6332 deep-groove ball bearing has a 160 mm bore, 340 mm outer diameter and 68 mm width (6.299 × 13.386 × 2.677 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6332 bore code work?", "a": "The last two digits of 6332 are bore code 32, giving 32 × 5 = 160 mm bore. The 340 mm outside diameter and 68 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6332 mean?", "a": "A bare 6332 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 160 mm bore?", "a": "The '3' is the medium diameter series: 340×68 mm, 90.0 mm radial section at 160 mm bore, carrying more load than a 6232 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6332?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6332 — the open (unsealed) execution, 160×340×68 mm per ISO 15. Quoted values: C 305 kN, C0 287 kN, mass 26200 g. The industry-neutral page spelling 6332 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6332", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6340", "brand": "NSK", "manufacturer_designation": "NSK 6340", "series": "6300-series", "type": "deep_groove", "d_mm": 200, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 415, "static_load_kN": 445, "weight_g": 55300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6340 carries bore code 40 = 200 mm. Outside diameter 420 mm and width 80 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 200 mm bore through a 420 mm OD and 80 mm width; the heavier rolling elements also trade away some speed versus a 6240.", "The open 6340 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×420×80 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6340 units.", "Shaft and housing fillets must clear the bearing chamfer so the 80 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6340 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 415/445 kN ratings, mass 55300 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6340; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6340 bearing?", "a": "A 6340 deep-groove ball bearing has a 200 mm bore, 420 mm outer diameter and 80 mm width (7.874 × 16.535 × 3.15 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6340 bore code work?", "a": "The last two digits of 6340 are bore code 40, giving 40 × 5 = 200 mm bore. The 420 mm outside diameter and 80 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6340 mean?", "a": "A bare 6340 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 200 mm bore?", "a": "The '3' is the medium diameter series: 420×80 mm, 110.0 mm radial section at 200 mm bore, carrying more load than a 6240 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6340?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6340 — the open (unsealed) execution, 200×420×80 mm per ISO 15. Quoted values: C 415 kN, C0 445 kN, mass 55300 g. The industry-neutral page spelling 6340 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6340", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6344", "brand": "NSK", "manufacturer_designation": "NSK 6344", "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": "steel", "dynamic_load_kN": 450, "static_load_kN": 520, "weight_g": 73900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6344 carries bore code 44 = 220 mm. Outside diameter 460 mm and width 88 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 220 mm bore through a 460 mm OD and 88 mm width; the heavier rolling elements also trade away some speed versus a 6244.", "The open 6344 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×460×88 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6344 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6344-C3. No clearance suffix means normal CN clearance.", "The open 6344 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 450/520 kN ratings, mass 73900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6344; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6344 bearing?", "a": "A 6344 deep-groove ball bearing has a 220 mm bore, 460 mm outer diameter and 88 mm width (8.661 × 18.11 × 3.465 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6344 bore code work?", "a": "The last two digits of 6344 are bore code 44, giving 44 × 5 = 220 mm bore. The 460 mm outside diameter and 88 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6344 mean?", "a": "A bare 6344 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 220 mm bore?", "a": "The '3' is the medium diameter series: 460×88 mm, 120.0 mm radial section at 220 mm bore, carrying more load than a 6244 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6344?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6344 — the open (unsealed) execution, 220×460×88 mm per ISO 15. Quoted values: C 450 kN, C0 520 kN, mass 73900 g. The industry-neutral page spelling 6344 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6344", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6348", "brand": "NSK", "manufacturer_designation": "NSK 6348", "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": "steel", "dynamic_load_kN": 515, "static_load_kN": 625, "weight_g": 94400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6348 carries bore code 48 = 240 mm. Outside diameter 500 mm and width 95 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 240 mm bore through a 500 mm OD and 95 mm width; the heavier rolling elements also trade away some speed versus a 6248.", "The open 6348 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×500×95 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6348 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 500 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6348.", "The open 6348 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 515/625 kN ratings, mass 94400 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6348; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6348 bearing?", "a": "A 6348 deep-groove ball bearing has a 240 mm bore, 500 mm outer diameter and 95 mm width (9.449 × 19.685 × 3.74 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6348 bore code work?", "a": "The last two digits of 6348 are bore code 48, giving 48 × 5 = 240 mm bore. The 500 mm outside diameter and 95 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6348 mean?", "a": "A bare 6348 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 240 mm bore?", "a": "The '3' is the medium diameter series: 500×95 mm, 130.0 mm radial section at 240 mm bore, carrying more load than a 6248 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6348?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6348 — the open (unsealed) execution, 240×500×95 mm per ISO 15. Quoted values: C 515 kN, C0 625 kN, mass 94400 g. The industry-neutral page spelling 6348 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6348", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "16001", "brand": "NTN", "manufacturer_designation": "NTN 16001JRX", "series": "16000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.65, "static_load_kN": 2.39, "fatigue_load_limit_kN": 0.19, "limiting_speed_rpm": 26000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 16001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 160xx narrow section at 12 mm bore shares the 28 mm outside diameter of the 6001 but is only 7 mm wide; a 6001 in a 7 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16001 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×28×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16001 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16001 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 5.65/2.39 kN load ratings, 0.19 kN fatigue load limit Cu and 19 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16001JRX; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16001 bearing?", "a": "A 16001 deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 7 mm width (0.472 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 16001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 16001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 16001 mean?", "a": "A bare 16001 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 12 mm bore?", "a": "160 is the narrow extra-light section: 28×7 mm with an 8.0 mm radial section at 12 mm bore. It has the same bore and outside diameter as the 6001 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16001?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16001JRX — the open (unsealed) execution, 12×28×7 mm per ISO 15. Quoted values: C 5.65 kN, C0 2.39 kN, Cu 0.19 kN, mass 19 g. Grease limiting speed 26000 rpm. The industry-neutral page spelling 16001 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16001", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "16001jrx" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=4", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6403-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 17, "D_mm": 62, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6403 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6403ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6403 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6403-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6403-2RS for that.", "Shielded 6403-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6403-ZZ.", "NTN catalogues the shielded version as 6403ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 25.2/10.8 kN load ratings, 0.84 kN fatigue load limit Cu and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6403ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6403-ZZ bearing?", "a": "A 6403-ZZ deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6403 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6403 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6403-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 17 mm bore?", "a": "The '4' is the heavy diameter series: 62×17 mm, 22.5 mm radial section at 17 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6403-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6403ZZ — two non-contact steel shields (NTN suffix ZZ), 17×62×17 mm per ISO 15. Quoted values: C 25.2 kN, C0 10.8 kN, Cu 0.84 kN, mass 270 g. Grease limiting speed 14000 rpm. The industry-neutral page spelling 6403-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6403", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6403", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=4", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6403-zz", "6403zz" ], "locale_variants": {}, "dynamic_load_kN": 25.2, "static_load_kN": 10.8, "load_derived": true, "manufacturer_designation": "NTN 6403ZZ", "material": "GCr15", "fatigue_load_limit_kN": 0.84, "limiting_speed_rpm": 14000 }, { "sku": "6404-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6404ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6404-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6404-2RS for that.", "Shielded 6404-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6404ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 31.5/13.9 kN load ratings, 1.09 kN fatigue load limit Cu and 400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6404ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6404-ZZ bearing?", "a": "A 6404-ZZ deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6404 bore code work?", "a": "The last two digits of 6404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6404-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 20 mm bore?", "a": "The '4' is the heavy diameter series: 72×19 mm, 26.0 mm radial section at 20 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6404-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6404ZZ — two non-contact steel shields (NTN suffix ZZ), 20×72×19 mm per ISO 15. Quoted values: C 31.5 kN, C0 13.9 kN, Cu 1.09 kN, mass 400 g. Grease limiting speed 12000 rpm. The industry-neutral page spelling 6404-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6404", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6404", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=5", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6404-zz", "6404zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 31.5, "static_load_kN": 13.9, "load_derived": true, "manufacturer_designation": "NTN 6404ZZ", "material": "GCr15", "fatigue_load_limit_kN": 1.09, "limiting_speed_rpm": 12000 }, { "sku": "6405-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 530, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6405ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6405-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 25 mm bore (80 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6405-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6405-2RS for that.", "Shielded 6405-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6405-ZZ-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6405ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 38.5/17.5 kN load ratings, 1.36 kN fatigue load limit Cu and 530 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6405ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6405-ZZ bearing?", "a": "A 6405-ZZ deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6405 bore code work?", "a": "The last two digits of 6405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6405-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 25 mm bore?", "a": "The '4' is the heavy diameter series: 80×21 mm, 27.5 mm radial section at 25 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6405-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6405ZZ — two non-contact steel shields (NTN suffix ZZ), 25×80×21 mm per ISO 15. Quoted values: C 38.5 kN, C0 17.5 kN, Cu 1.36 kN, mass 530 g. Grease limiting speed 10000 rpm. The industry-neutral page spelling 6405-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6405", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6405", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=5", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6405-zz", "6405zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 38.5, "static_load_kN": 17.5, "load_derived": true, "manufacturer_designation": "NTN 6405ZZ", "material": "GCr15", "fatigue_load_limit_kN": 1.36, "limiting_speed_rpm": 10000 }, { "sku": "6406-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 735, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6406ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6406-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 30 mm bore (90 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6406-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6406-2RS for that.", "Shielded 6406-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6406ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 48/23.9 kN load ratings, 1.86 kN fatigue load limit Cu and 735 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6406ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6406-ZZ bearing?", "a": "A 6406-ZZ deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6406 bore code work?", "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6406-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 30 mm bore?", "a": "The '4' is the heavy diameter series: 90×23 mm, 30.0 mm radial section at 30 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6406-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6406ZZ — two non-contact steel shields (NTN suffix ZZ), 30×90×23 mm per ISO 15. Quoted values: C 48 kN, C0 23.9 kN, Cu 1.86 kN, mass 735 g. Grease limiting speed 8800 rpm. The industry-neutral page spelling 6406-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6406", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6406", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=5", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6406-zz", "6406zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 48, "static_load_kN": 23.9, "load_derived": true, "manufacturer_designation": "NTN 6406ZZ", "material": "GCr15", "fatigue_load_limit_kN": 1.86, "limiting_speed_rpm": 8800 }, { "sku": "6407-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 952, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6407ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6407-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6407-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6407-2RS for that.", "Shielded 6407-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6407ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 61/31 kN load ratings, 2.43 kN fatigue load limit Cu and 952 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6407ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6407-ZZ bearing?", "a": "A 6407-ZZ deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6407 bore code work?", "a": "The last two digits of 6407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6407-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 35 mm bore?", "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6407-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6407ZZ — two non-contact steel shields (NTN suffix ZZ), 35×100×25 mm per ISO 15. Quoted values: C 61 kN, C0 31 kN, Cu 2.43 kN, mass 952 g. Grease limiting speed 7800 rpm. The industry-neutral page spelling 6407-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6407", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6407", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=5", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6407-zz", "6407zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 61, "static_load_kN": 31, "load_derived": true, "manufacturer_designation": "NTN 6407ZZ", "material": "GCr15", "fatigue_load_limit_kN": 2.43, "limiting_speed_rpm": 7800 }, { "sku": "6408-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6408ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6408-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 40 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6408-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6408-2RS for that.", "Shielded 6408-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6408ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 70.5/36.5 kN load ratings, 2.85 kN fatigue load limit Cu and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6408ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6408-ZZ bearing?", "a": "A 6408-ZZ deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6408 bore code work?", "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6408-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 40 mm bore?", "a": "The '4' is the heavy diameter series: 110×27 mm, 35.0 mm radial section at 40 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6408-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6408ZZ — two non-contact steel shields (NTN suffix ZZ), 40×110×27 mm per ISO 15. Quoted values: C 70.5 kN, C0 36.5 kN, Cu 2.85 kN, mass 1230 g. Grease limiting speed 7000 rpm. The industry-neutral page spelling 6408-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6408", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6408", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6408-zz", "6408zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 70.5, "static_load_kN": 36.5, "load_derived": true, "manufacturer_designation": "NTN 6408ZZ", "material": "GCr15", "fatigue_load_limit_kN": 2.85, "limiting_speed_rpm": 7000 }, { "sku": "16009", "brand": "NTN", "manufacturer_designation": "NTN 16009", "series": "16000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.3, "static_load_kN": 10.5, "fatigue_load_limit_kN": 0.72, "limiting_speed_rpm": 9200, "weight_g": 171, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16009; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 45 mm bore shares the 75 mm outside diameter of the 6009 but is only 10 mm wide; a 6009 in a 10 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16009 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×75×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16009 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16009 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 14.3/10.5 kN load ratings, 0.72 kN fatigue load limit Cu and 171 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16009; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16009 bearing?", "a": "A 16009 deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 10 mm width (1.772 × 2.953 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16009 bore code work?", "a": "The last two digits of 16009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16009 mean?", "a": "A bare 16009 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 45 mm bore?", "a": "160 is the narrow extra-light section: 75×10 mm with a 15.0 mm radial section at 45 mm bore. It has the same bore and outside diameter as the 6009 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16009?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16009 — the open (unsealed) execution, 45×75×10 mm per ISO 15. Quoted values: C 14.3 kN, C0 10.5 kN, Cu 0.72 kN, mass 171 g. Grease limiting speed 9200 rpm. The industry-neutral page spelling 16009 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16009", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6409-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1530, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6409ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6409-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 45 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6409-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6409-2RS for that.", "Shielded 6409-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6409-ZZ.", "NTN catalogues the shielded version as 6409ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 85.5/45 kN load ratings, 3.5 kN fatigue load limit Cu and 1530 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6409ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6409-ZZ bearing?", "a": "A 6409-ZZ deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6409 bore code work?", "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6409-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 45 mm bore?", "a": "The '4' is the heavy diameter series: 120×29 mm, 37.5 mm radial section at 45 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6409-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6409ZZ — two non-contact steel shields (NTN suffix ZZ), 45×120×29 mm per ISO 15. Quoted values: C 85.5 kN, C0 45 kN, Cu 3.5 kN, mass 1530 g. Grease limiting speed 6300 rpm. The industry-neutral page spelling 6409-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6409", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6409", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6409-zz", "6409zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 85.5, "static_load_kN": 45, "load_derived": true, "manufacturer_designation": "NTN 6409ZZ", "material": "GCr15", "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 6300 }, { "sku": "16010", "brand": "NTN", "manufacturer_designation": "NTN 16010", "series": "16000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.7, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.76, "limiting_speed_rpm": 8400, "weight_g": 180, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16010 with C3 for those conditions.", "The 160xx narrow section at 50 mm bore shares the 80 mm outside diameter of the 6010 but is only 10 mm wide; a 6010 in a 10 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16010 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×80×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16010 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16010-C3. No clearance suffix means normal CN clearance.", "The open 16010 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 14.7/11.3 kN load ratings, 0.76 kN fatigue load limit Cu and 180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16010; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16010 bearing?", "a": "A 16010 deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 10 mm width (1.969 × 3.15 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16010 bore code work?", "a": "The last two digits of 16010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16010 mean?", "a": "A bare 16010 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 50 mm bore?", "a": "160 is the narrow extra-light section: 80×10 mm with a 15.0 mm radial section at 50 mm bore. It has the same bore and outside diameter as the 6010 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16010?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16010 — the open (unsealed) execution, 50×80×10 mm per ISO 15. Quoted values: C 14.7 kN, C0 11.3 kN, Cu 0.76 kN, mass 180 g. Grease limiting speed 8400 rpm. The industry-neutral page spelling 16010 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16010", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6410-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6410ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6410 with C3 for those conditions.", "The 64xx heavy section at 50 mm bore (130 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6410-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6410-2RS for that.", "Shielded 6410-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6410ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 92/49.5 kN load ratings, 3.85 kN fatigue load limit Cu and 1880 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6410ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6410-ZZ bearing?", "a": "A 6410-ZZ deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6410 bore code work?", "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6410-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 50 mm bore?", "a": "The '4' is the heavy diameter series: 130×31 mm, 40.0 mm radial section at 50 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6410-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6410ZZ — two non-contact steel shields (NTN suffix ZZ), 50×130×31 mm per ISO 15. Quoted values: C 92 kN, C0 49.5 kN, Cu 3.85 kN, mass 1880 g. Grease limiting speed 5700 rpm. The industry-neutral page spelling 6410-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6410", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6410", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6410-zz", "6410zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 92, "static_load_kN": 49.5, "load_derived": true, "manufacturer_designation": "NTN 6410ZZ", "material": "GCr15", "fatigue_load_limit_kN": 3.85, "limiting_speed_rpm": 5700 }, { "sku": "6411-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6411ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.", "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6411-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6411-2RS for that.", "Shielded 6411-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6411-ZZ-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6411ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 98.5/54 kN load ratings, 4.2 kN fatigue load limit Cu and 2290 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6411ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6411-ZZ bearing?", "a": "A 6411-ZZ deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6411 bore code work?", "a": "The last two digits of 6411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6411-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 55 mm bore?", "a": "The '4' is the heavy diameter series: 140×33 mm, 42.5 mm radial section at 55 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6411-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6411ZZ — two non-contact steel shields (NTN suffix ZZ), 55×140×33 mm per ISO 15. Quoted values: C 98.5 kN, C0 54 kN, Cu 4.2 kN, mass 2290 g. Grease limiting speed 5200 rpm. The industry-neutral page spelling 6411-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6411", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6411", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6411-zz", "6411zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 98.5, "static_load_kN": 54, "load_derived": true, "manufacturer_designation": "NTN 6411ZZ", "material": "GCr15", "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 5200 }, { "sku": "16012", "brand": "NTN", "manufacturer_designation": "NTN 16012", "series": "16000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22.1, "static_load_kN": 17.5, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 7000, "weight_g": 283, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16012 with C3 for those conditions.", "The 160xx narrow section at 60 mm bore shares the 95 mm outside diameter of the 6012 but is only 11 mm wide; a 6012 in an 11 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16012 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×95×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16012 units.", "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16012 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 22.1/17.5 kN load ratings, 1.2 kN fatigue load limit Cu and 283 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16012; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16012 bearing?", "a": "A 16012 deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 11 mm width (2.362 × 3.74 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16012 bore code work?", "a": "The last two digits of 16012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 11 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16012 mean?", "a": "A bare 16012 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 60 mm bore?", "a": "160 is the narrow extra-light section: 95×11 mm with a 17.5 mm radial section at 60 mm bore. It has the same bore and outside diameter as the 6012 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16012?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16012 — the open (unsealed) execution, 60×95×11 mm per ISO 15. Quoted values: C 22.1 kN, C0 17.5 kN, Cu 1.2 kN, mass 283 g. Grease limiting speed 7000 rpm. The industry-neutral page spelling 16012 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16012", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6412-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2770, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6412ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.", "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6412-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6412-2RS for that.", "Shielded 6412-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6412ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 113/64.5 kN load ratings, 4.9 kN fatigue load limit Cu and 2770 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6412ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6412-ZZ bearing?", "a": "A 6412-ZZ deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6412 bore code work?", "a": "The last two digits of 6412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6412-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 60 mm bore?", "a": "The '4' is the heavy diameter series: 150×35 mm, 45.0 mm radial section at 60 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6412-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6412ZZ — two non-contact steel shields (NTN suffix ZZ), 60×150×35 mm per ISO 15. Quoted values: C 113 kN, C0 64.5 kN, Cu 4.9 kN, mass 2770 g. Grease limiting speed 4800 rpm. The industry-neutral page spelling 6412-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6412", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6412", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6412-zz", "6412zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 113, "static_load_kN": 64.5, "load_derived": true, "manufacturer_designation": "NTN 6412ZZ", "material": "GCr15", "fatigue_load_limit_kN": 4.9, "limiting_speed_rpm": 4800 }, { "sku": "16013", "brand": "NTN", "manufacturer_designation": "NTN 16013", "series": "16000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22.7, "static_load_kN": 18.7, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 6500, "weight_g": 307, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16013 with C3 for those conditions.", "The 160xx narrow section at 65 mm bore shares the 100 mm outside diameter of the 6013 but is only 11 mm wide; a 6013 in an 11 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16013 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×100×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16013 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16013 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 22.7/18.7 kN load ratings, 1.26 kN fatigue load limit Cu and 307 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16013; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16013 bearing?", "a": "A 16013 deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 11 mm width (2.559 × 3.937 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16013 bore code work?", "a": "The last two digits of 16013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 11 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16013 mean?", "a": "A bare 16013 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 65 mm bore?", "a": "160 is the narrow extra-light section: 100×11 mm with a 17.5 mm radial section at 65 mm bore. It has the same bore and outside diameter as the 6013 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16013?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16013 — the open (unsealed) execution, 65×100×11 mm per ISO 15. Quoted values: C 22.7 kN, C0 18.7 kN, Cu 1.26 kN, mass 307 g. Grease limiting speed 6500 rpm. The industry-neutral page spelling 16013 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16013", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16014", "brand": "NTN", "manufacturer_designation": "NTN 16014", "series": "16000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "weight_g": 441, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16014 with C3 for those conditions.", "The 160xx narrow section at 70 mm bore shares the 110 mm outside diameter of the 6014 but is only 13 mm wide; a 6014 in a 13 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16014 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×110×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16014 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16014.", "The open 16014 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu and 441 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16014; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16014 bearing?", "a": "A 16014 deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 13 mm width (2.756 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16014 bore code work?", "a": "The last two digits of 16014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16014 mean?", "a": "A bare 16014 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 70 mm bore?", "a": "160 is the narrow extra-light section: 110×13 mm with a 20.0 mm radial section at 70 mm bore. It has the same bore and outside diameter as the 6014 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16014?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16014 — the open (unsealed) execution, 70×110×13 mm per ISO 15. Quoted values: C 27 kN, C0 22.6 kN, Cu 1.52 kN, mass 441 g. Grease limiting speed 6100 rpm. The industry-neutral page spelling 16014 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16014", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16015", "brand": "NTN", "manufacturer_designation": "NTN 16015", "series": "16000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 5700, "weight_g": 464, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16015 with C3 for those conditions.", "The 160xx narrow section at 75 mm bore shares the 115 mm outside diameter of the 6015 but is only 13 mm wide; a 6015 in a 13 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16015 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16015 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16015 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 27.6/24 kN load ratings, 1.6 kN fatigue load limit Cu and 464 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16015; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16015 bearing?", "a": "A 16015 deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 13 mm width (2.953 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16015 bore code work?", "a": "The last two digits of 16015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16015 mean?", "a": "A bare 16015 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 75 mm bore?", "a": "160 is the narrow extra-light section: 115×13 mm with a 20.0 mm radial section at 75 mm bore. It has the same bore and outside diameter as the 6015 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16015?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16015 — the open (unsealed) execution, 75×115×13 mm per ISO 15. Quoted values: C 27.6 kN, C0 24 kN, Cu 1.6 kN, mass 464 g. Grease limiting speed 5700 rpm. The industry-neutral page spelling 16015 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16015", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16016", "brand": "NTN", "manufacturer_designation": "NTN 16016", "series": "16000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.1, "static_load_kN": 25.1, "fatigue_load_limit_kN": 1.64, "limiting_speed_rpm": 5300, "weight_g": 597, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 80 mm bore shares the 125 mm outside diameter of the 6016 but is only 14 mm wide; a 6016 in a 14 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16016 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×125×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16016 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16016-C3. No clearance suffix means normal CN clearance.", "The open 16016 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 28.1/25.1 kN load ratings, 1.64 kN fatigue load limit Cu and 597 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16016; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16016 bearing?", "a": "A 16016 deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 14 mm width (3.15 × 4.921 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16016 bore code work?", "a": "The last two digits of 16016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16016 mean?", "a": "A bare 16016 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 80 mm bore?", "a": "160 is the narrow extra-light section: 125×14 mm with a 22.5 mm radial section at 80 mm bore. It has the same bore and outside diameter as the 6016 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16016?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16016 — the open (unsealed) execution, 80×125×14 mm per ISO 15. Quoted values: C 28.1 kN, C0 25.1 kN, Cu 1.64 kN, mass 597 g. Grease limiting speed 5300 rpm. The industry-neutral page spelling 16016 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16016", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16017", "brand": "NTN", "manufacturer_designation": "NTN 16017", "series": "16000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.7, "static_load_kN": 26.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 5000, "weight_g": 626, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 85 mm bore shares the 130 mm outside diameter of the 6017 but is only 14 mm wide; a 6017 in a 14 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16017 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×130×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16017 units.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16017 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 28.7/26.2 kN load ratings, 1.68 kN fatigue load limit Cu and 626 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16017; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16017 bearing?", "a": "A 16017 deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 14 mm width (3.346 × 5.118 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16017 bore code work?", "a": "The last two digits of 16017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16017 mean?", "a": "A bare 16017 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 85 mm bore?", "a": "160 is the narrow extra-light section: 130×14 mm with a 22.5 mm radial section at 85 mm bore. It has the same bore and outside diameter as the 6017 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16017?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16017 — the open (unsealed) execution, 85×130×14 mm per ISO 15. Quoted values: C 28.7 kN, C0 26.2 kN, Cu 1.68 kN, mass 626 g. Grease limiting speed 5000 rpm. The industry-neutral page spelling 16017 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16017", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16018", "brand": "NTN", "manufacturer_designation": "NTN 16018", "series": "16000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 37, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.07, "limiting_speed_rpm": 4700, "weight_g": 848, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 90 mm bore shares the 140 mm outside diameter of the 6018 but is only 16 mm wide; a 6018 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16018 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16018 units.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16018 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 37/33.5 kN load ratings, 2.07 kN fatigue load limit Cu and 848 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16018; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16018 bearing?", "a": "A 16018 deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 16 mm width (3.543 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16018 bore code work?", "a": "The last two digits of 16018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16018 mean?", "a": "A bare 16018 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 90 mm bore?", "a": "160 is the narrow extra-light section: 140×16 mm with a 25.0 mm radial section at 90 mm bore. It has the same bore and outside diameter as the 6018 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16018?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16018 — the open (unsealed) execution, 90×140×16 mm per ISO 15. Quoted values: C 37 kN, C0 33.5 kN, Cu 2.07 kN, mass 848 g. Grease limiting speed 4700 rpm. The industry-neutral page spelling 16018 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16018", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16019", "brand": "NTN", "manufacturer_designation": "NTN 16019", "series": "16000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 38, "static_load_kN": 35, "fatigue_load_limit_kN": 2.13, "limiting_speed_rpm": 4500, "weight_g": 885, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 95 mm bore shares the 145 mm outside diameter of the 6019 but is only 16 mm wide; a 6019 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16019 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×145×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16019 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16019 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 38/35 kN load ratings, 2.13 kN fatigue load limit Cu and 885 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16019; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16019 bearing?", "a": "A 16019 deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 16 mm width (3.74 × 5.709 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16019 bore code work?", "a": "The last two digits of 16019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16019 mean?", "a": "A bare 16019 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 95 mm bore?", "a": "160 is the narrow extra-light section: 145×16 mm with a 25.0 mm radial section at 95 mm bore. It has the same bore and outside diameter as the 6019 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16019?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16019 — the open (unsealed) execution, 95×145×16 mm per ISO 15. Quoted values: C 38 kN, C0 35 kN, Cu 2.13 kN, mass 885 g. Grease limiting speed 4500 rpm. The industry-neutral page spelling 16019 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16019", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16020", "brand": "NTN", "manufacturer_designation": "NTN 16020", "series": "16000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 39, "static_load_kN": 36.5, "fatigue_load_limit_kN": 2.18, "limiting_speed_rpm": 4200, "weight_g": 910, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 100 mm bore shares the 150 mm outside diameter of the 6020 but is only 16 mm wide; a 6020 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16020 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×150×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16020 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16020.", "The open 16020 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 39/36.5 kN load ratings, 2.18 kN fatigue load limit Cu and 910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16020; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16020 bearing?", "a": "A 16020 deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 16 mm width (3.937 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16020 bore code work?", "a": "The last two digits of 16020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16020 mean?", "a": "A bare 16020 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 100 mm bore?", "a": "160 is the narrow extra-light section: 150×16 mm with a 25.0 mm radial section at 100 mm bore. It has the same bore and outside diameter as the 6020 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16020?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16020 — the open (unsealed) execution, 100×150×16 mm per ISO 15. Quoted values: C 39 kN, C0 36.5 kN, Cu 2.18 kN, mass 910 g. Grease limiting speed 4200 rpm. The industry-neutral page spelling 16020 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16020", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61921-2RS", "brand": "NTN", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 816, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6921LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61921-2RS runs slower and cooler-limited than the open 61921; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61921-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6921LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61921-2RS bearing?", "a": "A 61921-2RS deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61921-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61921-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6921LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LU), 105×145×20 mm per ISO 15. Quoted values: C 47 kN, C0 42 kN, Cu 2.52 kN, mass 816 g. Grease limiting speed 2500 rpm. The industry-neutral page spelling 61921-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61921", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61921-llu", "6921llu" ], "locale_variants": {}, "dynamic_load_kN": 47, "static_load_kN": 42, "load_derived": true, "manufacturer_designation": "NTN 6921LLU", "material": "GCr15", "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 2500 }, { "sku": "16021", "brand": "NTN", "manufacturer_designation": "NTN 16021", "series": "16000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 57.5, "static_load_kN": 50.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 4000, "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 105 mm bore shares the 160 mm outside diameter of the 6021 but is only 18 mm wide; a 6021 in a 18 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16021 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×160×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16021 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16021 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 57.5/50.5 kN load ratings, 3 kN fatigue load limit Cu and 1200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16021; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16021 bearing?", "a": "A 16021 deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 18 mm width (4.134 × 6.299 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16021 bore code work?", "a": "The last two digits of 16021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16021 mean?", "a": "A bare 16021 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 105 mm bore?", "a": "160 is the narrow extra-light section: 160×18 mm with a 27.5 mm radial section at 105 mm bore. It has the same bore and outside diameter as the 6021 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16021?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16021 — the open (unsealed) execution, 105×160×18 mm per ISO 15. Quoted values: C 57.5 kN, C0 50.5 kN, Cu 3 kN, mass 1200 g. Grease limiting speed 4000 rpm. The industry-neutral page spelling 16021 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16021", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16022", "brand": "NTN", "manufacturer_designation": "NTN 16022", "series": "16000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 63.5, "static_load_kN": 56.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 3800, "weight_g": 1460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 110 mm bore shares the 170 mm outside diameter of the 6022 but is only 19 mm wide; a 6022 in a 19 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16022 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×170×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16022 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16022-C3. No clearance suffix means normal CN clearance.", "The open 16022 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 63.5/56.5 kN load ratings, 3.25 kN fatigue load limit Cu and 1460 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16022; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16022 bearing?", "a": "A 16022 deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 19 mm width (4.331 × 6.693 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16022 bore code work?", "a": "The last two digits of 16022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16022 mean?", "a": "A bare 16022 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 110 mm bore?", "a": "160 is the narrow extra-light section: 170×19 mm with a 30.0 mm radial section at 110 mm bore. It has the same bore and outside diameter as the 6022 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16022?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16022 — the open (unsealed) execution, 110×170×19 mm per ISO 15. Quoted values: C 63.5 kN, C0 56.5 kN, Cu 3.25 kN, mass 1460 g. Grease limiting speed 3800 rpm. The industry-neutral page spelling 16022 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16022", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6322-2RS", "brand": "NTN", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 9540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6322LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "Contact seals add drag and heat: 6322-2RS runs slower and cooler-limited than the open 6322; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6322-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6322-2RS-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6322LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6322-2RS bearing?", "a": "A 6322-2RS deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6322-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 110 mm bore?", "a": "The '3' is the medium diameter series: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 6222 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN designation and catalogue data for 6322-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6322LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LLU), 110×240×50 mm per ISO 15. Quoted values: C 227 kN, C0 179 kN, Cu 10.5 kN, mass 9540 g. Grease limiting speed 1900 rpm. The industry-neutral page spelling 6322-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6322", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LLU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322-llu", "6322llu" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 227, "static_load_kN": 179, "load_derived": true, "manufacturer_designation": "NTN 6322LLU", "material": "GCr15", "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 1900 }, { "sku": "6322-RSR", "brand": "NTN", "manufacturer_designation": "NTN 6322LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2900, "weight_g": 9540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6322LLB), mapped here from the industry-neutral -RSR spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "RSR low-friction seals on 6322-RSR run faster than contact-seal 6322-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6322-2RS instead.", "The non-contact lip of 6322-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 50 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6322LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322LLB; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6322-RSR bearing?", "a": "A 6322-RSR deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6322-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 110 mm bore?", "a": "The '3' is the medium diameter series: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 6222 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN designation and catalogue data for 6322-RSR?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6322LLB — two low-friction non-contact rubber seals (NTN suffix LLB), 110×240×50 mm per ISO 15. Quoted values: C 227 kN, C0 179 kN, Cu 10.5 kN, mass 9540 g. Grease limiting speed 2900 rpm. The industry-neutral page spelling 6322-RSR follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6322", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LLB maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "aliases": [ "6322-llb", "6322llb" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61924-2RS", "brand": "NTN", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6924LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61924-2RS runs slower and cooler-limited than the open 61924; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61924-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6924LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 59/54 kN load ratings, 3.05 kN fatigue load limit Cu and 1150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6924LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61924-2RS bearing?", "a": "A 61924-2RS deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61924 bore code work?", "a": "The last two digits of 61924 are bore code 24, giving 24 × 5 = 120 mm bore. The 165 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61924-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 120 mm bore?", "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61924-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6924LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LU), 120×165×22 mm per ISO 15. Quoted values: C 59 kN, C0 54 kN, Cu 3.05 kN, mass 1150 g. Grease limiting speed 2100 rpm. The industry-neutral page spelling 61924-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61924", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61924-llu", "6924llu" ], "locale_variants": {}, "dynamic_load_kN": 59, "static_load_kN": 54, "load_derived": true, "manufacturer_designation": "NTN 6924LLU", "material": "GCr15", "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 2100 }, { "sku": "61926-2RS", "brand": "NTN", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1520, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6926LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 130 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61926-2RS runs slower and cooler-limited than the open 61926; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61926-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6926LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 72/67.5 kN load ratings, 3.65 kN fatigue load limit Cu and 1520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6926LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61926-2RS bearing?", "a": "A 61926-2RS deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61926 bore code work?", "a": "The last two digits of 61926 are bore code 26, giving 26 × 5 = 130 mm bore. The 180 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61926-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61926-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6926LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LU), 130×180×24 mm per ISO 15. Quoted values: C 72 kN, C0 67.5 kN, Cu 3.65 kN, mass 1520 g. Grease limiting speed 1900 rpm. The industry-neutral page spelling 61926-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61926", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61926-llu", "6926llu" ], "locale_variants": {}, "dynamic_load_kN": 72, "static_load_kN": 67.5, "load_derived": true, "manufacturer_designation": "NTN 6926LLU", "material": "GCr15", "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 1900 }, { "sku": "61928-2RS", "brand": "NTN", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1620, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6928LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61928-2RS runs slower and cooler-limited than the open 61928; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61928-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6928LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 74/71.5 kN load ratings, 3.7 kN fatigue load limit Cu and 1620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6928LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61928-2RS bearing?", "a": "A 61928-2RS deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61928 bore code work?", "a": "The last two digits of 61928 are bore code 28, giving 28 × 5 = 140 mm bore. The 190 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61928-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61928-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6928LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LU), 140×190×24 mm per ISO 15. Quoted values: C 74 kN, C0 71.5 kN, Cu 3.7 kN, mass 1620 g. Grease limiting speed 1800 rpm. The industry-neutral page spelling 61928-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61928", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61928-llu", "6928llu" ], "locale_variants": {}, "dynamic_load_kN": 74, "static_load_kN": 71.5, "load_derived": true, "manufacturer_designation": "NTN 6928LLU", "material": "GCr15", "fatigue_load_limit_kN": 3.7, "limiting_speed_rpm": 1800 }, { "sku": "6230-2RS", "brand": "NTN", "manufacturer_designation": "NTN 6230LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 195, "static_load_kN": 168, "fatigue_load_limit_kN": 9.05, "limiting_speed_rpm": 1500, "weight_g": 9410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6230LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6230-2RS runs slower and cooler-limited than the open 6230; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6230-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6230LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 195/168 kN load ratings, 9.05 kN fatigue load limit Cu and 9410 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6230LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6230-2RS bearing?", "a": "A 6230-2RS deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6230 bore code work?", "a": "The last two digits of 6230 are bore code 30, giving 30 × 5 = 150 mm bore. The 270 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6230-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "What is the NTN designation and catalogue data for 6230-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6230LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LLU), 150×270×45 mm per ISO 15. Quoted values: C 195 kN, C0 168 kN, Cu 9.05 kN, mass 9410 g. Grease limiting speed 1500 rpm. The industry-neutral page spelling 6230-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6230", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LLU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "aliases": [ "6230-llu", "6230llu" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16044", "brand": "NTN", "manufacturer_designation": "NTN 16044", "series": "16000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 200, "static_load_kN": 216, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 1800, "weight_g": 11300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 220 mm bore shares the 340 mm outside diameter of the 6044 but is only 37 mm wide; a 6044 in a 37 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16044 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×340×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16044 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16044.", "The open 16044 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200/216 kN load ratings, 8.65 kN fatigue load limit Cu and 11300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16044; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16044 bearing?", "a": "A 16044 deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 37 mm width (8.661 × 13.386 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16044 bore code work?", "a": "The last two digits of 16044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16044 mean?", "a": "A bare 16044 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 220 mm bore?", "a": "160 is the narrow extra-light section: 340×37 mm with a 60.0 mm radial section at 220 mm bore. It has the same bore and outside diameter as the 6044 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16044?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16044 — the open (unsealed) execution, 220×340×37 mm per ISO 15. Quoted values: C 200 kN, C0 216 kN, Cu 8.65 kN, mass 11300 g. Grease limiting speed 1800 rpm. The industry-neutral page spelling 16044 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16044", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16048", "brand": "NTN", "manufacturer_designation": "NTN 16048", "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": "steel", "dynamic_load_kN": 197, "static_load_kN": 217, "fatigue_load_limit_kN": 8.3, "limiting_speed_rpm": 1700, "weight_g": 12100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16048 carries bore code 48 = 240 mm. Outside diameter 360 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 240 mm bore shares the 360 mm outside diameter of the 6048 but is only 37 mm wide; a 6048 in a 37 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16048 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×360×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16048 units.", "Shaft and housing fillets must clear the bearing chamfer so the 37 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16048 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 197/217 kN load ratings, 8.3 kN fatigue load limit Cu and 12100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16048; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16048 bearing?", "a": "A 16048 deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 37 mm width (9.449 × 14.173 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16048 bore code work?", "a": "The last two digits of 16048 are bore code 48, giving 48 × 5 = 240 mm bore. The 360 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16048 mean?", "a": "A bare 16048 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 240 mm bore?", "a": "160 is the narrow extra-light section: 360×37 mm with a 60.0 mm radial section at 240 mm bore. It has the same bore and outside diameter as the 6048 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16048?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16048 — the open (unsealed) execution, 240×360×37 mm per ISO 15. Quoted values: C 197 kN, C0 217 kN, Cu 8.3 kN, mass 12100 g. Grease limiting speed 1700 rpm. The industry-neutral page spelling 16048 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16048", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16052", "brand": "NTN", "manufacturer_designation": "NTN 16052", "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": "steel", "dynamic_load_kN": 252, "static_load_kN": 299, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 1500, "weight_g": 18500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16052 carries bore code 52 = 260 mm. Outside diameter 400 mm and width 44 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 260 mm bore shares the 400 mm outside diameter of the 6052 but is only 44 mm wide; a 6052 in a 44 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16052 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×400×44 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16052 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16052-C3. No clearance suffix means normal CN clearance.", "The open 16052 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 252/299 kN load ratings, 11.1 kN fatigue load limit Cu and 18500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16052; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16052 bearing?", "a": "A 16052 deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 44 mm width (10.236 × 15.748 × 1.732 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16052 bore code work?", "a": "The last two digits of 16052 are bore code 52, giving 52 × 5 = 260 mm bore. The 400 mm outside diameter and 44 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16052 mean?", "a": "A bare 16052 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 260 mm bore?", "a": "160 is the narrow extra-light section: 400×44 mm with a 70.0 mm radial section at 260 mm bore. It has the same bore and outside diameter as the 6052 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16052?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16052 — the open (unsealed) execution, 260×400×44 mm per ISO 15. Quoted values: C 252 kN, C0 299 kN, Cu 11.1 kN, mass 18500 g. Grease limiting speed 1500 rpm. The industry-neutral page spelling 16052 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16052", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16056", "brand": "NTN", "manufacturer_designation": "NTN 16056", "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": "steel", "dynamic_load_kN": 257, "static_load_kN": 315, "fatigue_load_limit_kN": 11.3, "limiting_speed_rpm": 1400, "weight_g": 23000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16056 carries bore code 56 = 280 mm. Outside diameter 420 mm and width 44 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 280 mm bore shares the 420 mm outside diameter of the 6056 but is only 44 mm wide; a 6056 in a 44 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16056 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×420×44 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16056 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16056.", "The open 16056 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 257/315 kN load ratings, 11.3 kN fatigue load limit Cu and 23000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16056; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16056 bearing?", "a": "A 16056 deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 44 mm width (11.024 × 16.535 × 1.732 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16056 bore code work?", "a": "The last two digits of 16056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 44 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16056 mean?", "a": "A bare 16056 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 280 mm bore?", "a": "160 is the narrow extra-light section: 420×44 mm with a 70.0 mm radial section at 280 mm bore. It has the same bore and outside diameter as the 6056 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16056?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16056 — the open (unsealed) execution, 280×420×44 mm per ISO 15. Quoted values: C 257 kN, C0 315 kN, Cu 11.3 kN, mass 23000 g. Grease limiting speed 1400 rpm. The industry-neutral page spelling 16056 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16056", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16060", "brand": "NTN", "manufacturer_designation": "NTN 16060", "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": "steel", "dynamic_load_kN": 325, "static_load_kN": 410, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 1300, "weight_g": 32500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16060 carries bore code 60 = 300 mm. Outside diameter 460 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 300 mm bore shares the 460 mm outside diameter of the 6060 but is only 50 mm wide; a 6060 in a 50 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16060 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×460×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16060 units.", "Shaft and housing fillets must clear the bearing chamfer so the 50 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16060 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 325/410 kN load ratings, 14.5 kN fatigue load limit Cu and 32500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16060; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16060 bearing?", "a": "A 16060 deep-groove ball bearing has a 300 mm bore, 460 mm outer diameter and 50 mm width (11.811 × 18.11 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16060 bore code work?", "a": "The last two digits of 16060 are bore code 60, giving 60 × 5 = 300 mm bore. The 460 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16060 mean?", "a": "A bare 16060 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 300 mm bore?", "a": "160 is the narrow extra-light section: 460×50 mm with a 80.0 mm radial section at 300 mm bore. It has the same bore and outside diameter as the 6060 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16060?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16060 — the open (unsealed) execution, 300×460×50 mm per ISO 15. Quoted values: C 325 kN, C0 410 kN, Cu 14.5 kN, mass 32500 g. Grease limiting speed 1300 rpm. The industry-neutral page spelling 16060 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16060", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6060", "brand": "NTN", "manufacturer_designation": "NTN 6060", "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": "steel", "dynamic_load_kN": 395, "static_load_kN": 480, "fatigue_load_limit_kN": 18.4, "limiting_speed_rpm": 1300, "weight_g": 43800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6060 carries bore code 60 = 300 mm. Outside diameter 460 mm and width 74 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 300 mm bore uses a smaller 460 mm OD than a 6260; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6060 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×460×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6060 units.", "Shaft and housing fillets must clear the bearing chamfer so the 74 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6060 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 395/480 kN load ratings, 18.4 kN fatigue load limit Cu and 43800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6060; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6060 bearing?", "a": "A 6060 deep-groove ball bearing has a 300 mm bore, 460 mm outer diameter and 74 mm width (11.811 × 18.11 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6060 bore code work?", "a": "The last two digits of 6060 are bore code 60, giving 60 × 5 = 300 mm bore. The 460 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6060 mean?", "a": "A bare 6060 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 300 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (460×74 mm, 80.0 mm radial section) at 300 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6060?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6060 — the open (unsealed) execution, 300×460×74 mm per ISO 15. Quoted values: C 395 kN, C0 480 kN, Cu 18.4 kN, mass 43800 g. Grease limiting speed 1300 rpm. The industry-neutral page spelling 6060 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6060", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61964", "brand": "NTN", "manufacturer_designation": "NTN 6964", "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": "steel", "dynamic_load_kN": 315, "static_load_kN": 405, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 1300, "weight_g": 24800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61964 carries bore code 64 = 320 mm. Outside diameter 440 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (60.0 mm section height at 320 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61964 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×440×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61964 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61964 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 315/405 kN load ratings, 14.1 kN fatigue load limit Cu and 24800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6964; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61964 bearing?", "a": "A 61964 deep-groove ball bearing has a 320 mm bore, 440 mm outer diameter and 56 mm width (12.598 × 17.323 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61964 bore code work?", "a": "The last two digits of 61964 are bore code 64, giving 64 × 5 = 320 mm bore. The 440 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61964 mean?", "a": "A bare 61964 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 320 mm bore?", "a": "619 is a thin section one step above 618: 440×56 mm with a 60.0 mm radial section at 320 mm bore; a 6264 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61964?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6964 — the open (unsealed) execution, 320×440×56 mm per ISO 15. Quoted values: C 315 kN, C0 405 kN, Cu 14.1 kN, mass 24800 g. Grease limiting speed 1300 rpm. The industry-neutral page spelling 61964 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61964", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6964" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16064", "brand": "NTN", "manufacturer_designation": "NTN 16064", "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": "steel", "dynamic_load_kN": 335, "static_load_kN": 440, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 1200, "weight_g": 34200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16064 carries bore code 64 = 320 mm. Outside diameter 480 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 320 mm bore shares the 480 mm outside diameter of the 6064 but is only 50 mm wide; a 6064 in a 50 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16064 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×480×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16064 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16064-C3. No clearance suffix means normal CN clearance.", "The open 16064 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 335/440 kN load ratings, 14.9 kN fatigue load limit Cu and 34200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16064; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16064 bearing?", "a": "A 16064 deep-groove ball bearing has a 320 mm bore, 480 mm outer diameter and 50 mm width (12.598 × 18.898 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16064 bore code work?", "a": "The last two digits of 16064 are bore code 64, giving 64 × 5 = 320 mm bore. The 480 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16064 mean?", "a": "A bare 16064 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 320 mm bore?", "a": "160 is the narrow extra-light section: 480×50 mm with a 80.0 mm radial section at 320 mm bore. It has the same bore and outside diameter as the 6064 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16064?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16064 — the open (unsealed) execution, 320×480×50 mm per ISO 15. Quoted values: C 335 kN, C0 440 kN, Cu 14.9 kN, mass 34200 g. Grease limiting speed 1200 rpm. The industry-neutral page spelling 16064 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16064", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6064", "brand": "NTN", "manufacturer_designation": "NTN 6064", "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": "steel", "dynamic_load_kN": 410, "static_load_kN": 530, "fatigue_load_limit_kN": 19.3, "limiting_speed_rpm": 1200, "weight_g": 46100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6064 carries bore code 64 = 320 mm. Outside diameter 480 mm and width 74 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 320 mm bore uses a smaller 480 mm OD than a 6264; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6064 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×480×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6064 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6064-C3. No clearance suffix means normal CN clearance.", "The open 6064 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 410/530 kN load ratings, 19.3 kN fatigue load limit Cu and 46100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6064; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6064 bearing?", "a": "A 6064 deep-groove ball bearing has a 320 mm bore, 480 mm outer diameter and 74 mm width (12.598 × 18.898 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6064 bore code work?", "a": "The last two digits of 6064 are bore code 64, giving 64 × 5 = 320 mm bore. The 480 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6064 mean?", "a": "A bare 6064 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 320 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (480×74 mm, 80.0 mm radial section) at 320 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6064?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6064 — the open (unsealed) execution, 320×480×74 mm per ISO 15. Quoted values: C 410 kN, C0 530 kN, Cu 19.3 kN, mass 46100 g. Grease limiting speed 1200 rpm. The industry-neutral page spelling 6064 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6064", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61968", "brand": "NTN", "manufacturer_designation": "NTN 6968", "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": "steel", "dynamic_load_kN": 325, "static_load_kN": 430, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 1200, "weight_g": 26200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61968 carries bore code 68 = 340 mm. Outside diameter 460 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 340 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (60.0 mm section height at 340 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61968 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×460×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61968 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61968 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 325/430 kN load ratings, 14.4 kN fatigue load limit Cu and 26200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6968; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61968 bearing?", "a": "A 61968 deep-groove ball bearing has a 340 mm bore, 460 mm outer diameter and 56 mm width (13.386 × 18.11 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61968 bore code work?", "a": "The last two digits of 61968 are bore code 68, giving 68 × 5 = 340 mm bore. The 460 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61968 mean?", "a": "A bare 61968 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 340 mm bore?", "a": "619 is a thin section one step above 618: 460×56 mm with a 60.0 mm radial section at 340 mm bore; a 6268 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61968?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6968 — the open (unsealed) execution, 340×460×56 mm per ISO 15. Quoted values: C 325 kN, C0 430 kN, Cu 14.4 kN, mass 26200 g. Grease limiting speed 1200 rpm. The industry-neutral page spelling 61968 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61968", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6968" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16068", "brand": "NTN", "manufacturer_designation": "NTN 16068", "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": "steel", "dynamic_load_kN": 380, "static_load_kN": 515, "fatigue_load_limit_kN": 17, "limiting_speed_rpm": 1100, "weight_g": 47100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16068 carries bore code 68 = 340 mm. Outside diameter 520 mm and width 57 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 340 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 340 mm bore shares the 520 mm outside diameter of the 6068 but is only 57 mm wide; a 6068 in a 57 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16068 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×520×57 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16068 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 520 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16068.", "The open 16068 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380/515 kN load ratings, 17 kN fatigue load limit Cu and 47100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16068; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16068 bearing?", "a": "A 16068 deep-groove ball bearing has a 340 mm bore, 520 mm outer diameter and 57 mm width (13.386 × 20.472 × 2.244 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16068 bore code work?", "a": "The last two digits of 16068 are bore code 68, giving 68 × 5 = 340 mm bore. The 520 mm outside diameter and 57 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16068 mean?", "a": "A bare 16068 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 340 mm bore?", "a": "160 is the narrow extra-light section: 520×57 mm with a 90.0 mm radial section at 340 mm bore. It has the same bore and outside diameter as the 6068 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16068?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16068 — the open (unsealed) execution, 340×520×57 mm per ISO 15. Quoted values: C 380 kN, C0 515 kN, Cu 17 kN, mass 47100 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 16068 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16068", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6068", "brand": "NTN", "manufacturer_designation": "NTN 6068", "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": "steel", "dynamic_load_kN": 465, "static_load_kN": 610, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 1100, "weight_g": 61800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6068 carries bore code 68 = 340 mm. Outside diameter 520 mm and width 82 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 340 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 340 mm bore uses a smaller 520 mm OD than a 6268; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6068 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×520×82 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6068 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 520 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6068.", "The open 6068 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 465/610 kN load ratings, 21.9 kN fatigue load limit Cu and 61800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6068; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6068 bearing?", "a": "A 6068 deep-groove ball bearing has a 340 mm bore, 520 mm outer diameter and 82 mm width (13.386 × 20.472 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6068 bore code work?", "a": "The last two digits of 6068 are bore code 68, giving 68 × 5 = 340 mm bore. The 520 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6068 mean?", "a": "A bare 6068 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 340 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (520×82 mm, 90.0 mm radial section) at 340 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6068?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6068 — the open (unsealed) execution, 340×520×82 mm per ISO 15. Quoted values: C 465 kN, C0 610 kN, Cu 21.9 kN, mass 61800 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 6068 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6068", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61872", "brand": "NTN", "manufacturer_designation": "NTN 6872", "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": "steel", "dynamic_load_kN": 207, "static_load_kN": 258, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 1200, "weight_g": 12300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61872 carries bore code 72 = 360 mm. Outside diameter 440 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 360 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 360 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6272.", "The open 61872 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×440×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61872 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61872-C3. No clearance suffix means normal CN clearance.", "The open 61872 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 207/258 kN load ratings, 8.55 kN fatigue load limit Cu and 12300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6872; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61872 bearing?", "a": "A 61872 deep-groove ball bearing has a 360 mm bore, 440 mm outer diameter and 38 mm width (14.173 × 17.323 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61872 bore code work?", "a": "The last two digits of 61872 are bore code 72, giving 72 × 5 = 360 mm bore. The 440 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61872 mean?", "a": "A bare 61872 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 360 mm bore?", "a": "618 is an extra-thin section: 440×38 mm, only 40.0 mm radial section at 360 mm bore, far smaller than a 6272, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61872?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6872 — the open (unsealed) execution, 360×440×38 mm per ISO 15. Quoted values: C 207 kN, C0 258 kN, Cu 8.55 kN, mass 12300 g. Grease limiting speed 1200 rpm. The industry-neutral page spelling 61872 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61872", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6872" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61972", "brand": "NTN", "manufacturer_designation": "NTN 6972", "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": "steel", "dynamic_load_kN": 330, "static_load_kN": 455, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 1100, "weight_g": 27500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61972 carries bore code 72 = 360 mm. Outside diameter 480 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 360 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (60.0 mm section height at 360 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61972 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×480×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61972 units.", "A 360 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61972 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 330/455 kN load ratings, 14.8 kN fatigue load limit Cu and 27500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6972; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61972 bearing?", "a": "A 61972 deep-groove ball bearing has a 360 mm bore, 480 mm outer diameter and 56 mm width (14.173 × 18.898 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61972 bore code work?", "a": "The last two digits of 61972 are bore code 72, giving 72 × 5 = 360 mm bore. The 480 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61972 mean?", "a": "A bare 61972 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 360 mm bore?", "a": "619 is a thin section one step above 618: 480×56 mm with a 60.0 mm radial section at 360 mm bore; a 6272 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61972?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6972 — the open (unsealed) execution, 360×480×56 mm per ISO 15. Quoted values: C 330 kN, C0 455 kN, Cu 14.8 kN, mass 27500 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 61972 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61972", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6972" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16072", "brand": "NTN", "manufacturer_designation": "NTN 16072", "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": "steel", "dynamic_load_kN": 390, "static_load_kN": 550, "fatigue_load_limit_kN": 17.6, "limiting_speed_rpm": 1100, "weight_g": 49300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16072 carries bore code 72 = 360 mm. Outside diameter 540 mm and width 57 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 360 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 360 mm bore shares the 540 mm outside diameter of the 6072 but is only 57 mm wide; a 6072 in a 57 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16072 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×540×57 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16072 units.", "Shaft and housing fillets must clear the bearing chamfer so the 57 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16072 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 390/550 kN load ratings, 17.6 kN fatigue load limit Cu and 49300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16072; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16072 bearing?", "a": "A 16072 deep-groove ball bearing has a 360 mm bore, 540 mm outer diameter and 57 mm width (14.173 × 21.26 × 2.244 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16072 bore code work?", "a": "The last two digits of 16072 are bore code 72, giving 72 × 5 = 360 mm bore. The 540 mm outside diameter and 57 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16072 mean?", "a": "A bare 16072 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 360 mm bore?", "a": "160 is the narrow extra-light section: 540×57 mm with a 90.0 mm radial section at 360 mm bore. It has the same bore and outside diameter as the 6072 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16072?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16072 — the open (unsealed) execution, 360×540×57 mm per ISO 15. Quoted values: C 390 kN, C0 550 kN, Cu 17.6 kN, mass 49300 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 16072 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16072", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6072", "brand": "NTN", "manufacturer_designation": "NTN 6072", "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": "steel", "dynamic_load_kN": 485, "static_load_kN": 670, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 1100, "weight_g": 64700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6072 carries bore code 72 = 360 mm. Outside diameter 540 mm and width 82 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 360 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 360 mm bore uses a smaller 540 mm OD than a 6272; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6072 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×540×82 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6072 units.", "Shaft and housing fillets must clear the bearing chamfer so the 82 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6072 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 485/670 kN load ratings, 23 kN fatigue load limit Cu and 64700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6072; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6072 bearing?", "a": "A 6072 deep-groove ball bearing has a 360 mm bore, 540 mm outer diameter and 82 mm width (14.173 × 21.26 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6072 bore code work?", "a": "The last two digits of 6072 are bore code 72, giving 72 × 5 = 360 mm bore. The 540 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6072 mean?", "a": "A bare 6072 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 360 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (540×82 mm, 90.0 mm radial section) at 360 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6072?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6072 — the open (unsealed) execution, 360×540×82 mm per ISO 15. Quoted values: C 485 kN, C0 670 kN, Cu 23 kN, mass 64700 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 6072 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6072", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61876", "brand": "NTN", "manufacturer_designation": "NTN 6876", "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": "steel", "dynamic_load_kN": 256, "static_load_kN": 340, "fatigue_load_limit_kN": 10.8, "limiting_speed_rpm": 1100, "weight_g": 19700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61876 carries bore code 76 = 380 mm. Outside diameter 480 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 380 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 380 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6276.", "The open 61876 has no lubricant retention: grease escapes and contaminants migrate straight into the 380×480×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61876 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 480 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61876.", "The open 61876 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 256/340 kN load ratings, 10.8 kN fatigue load limit Cu and 19700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6876; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61876 bearing?", "a": "A 61876 deep-groove ball bearing has a 380 mm bore, 480 mm outer diameter and 46 mm width (14.961 × 18.898 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61876 bore code work?", "a": "The last two digits of 61876 are bore code 76, giving 76 × 5 = 380 mm bore. The 480 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61876 mean?", "a": "A bare 61876 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 380 mm bore?", "a": "618 is an extra-thin section: 480×46 mm, only 50.0 mm radial section at 380 mm bore, far smaller than a 6276, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61876?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6876 — the open (unsealed) execution, 380×480×46 mm per ISO 15. Quoted values: C 256 kN, C0 340 kN, Cu 10.8 kN, mass 19700 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 61876 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61876", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6876" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61976", "brand": "NTN", "manufacturer_designation": "NTN 6976", "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": "steel", "dynamic_load_kN": 360, "static_load_kN": 510, "fatigue_load_limit_kN": 15.9, "limiting_speed_rpm": 1100, "weight_g": 39800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61976 carries bore code 76 = 380 mm. Outside diameter 520 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 380 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (70.0 mm section height at 380 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61976 has no lubricant retention: grease escapes and contaminants migrate straight into the 380×520×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61976 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61976 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360/510 kN load ratings, 15.9 kN fatigue load limit Cu and 39800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6976; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61976 bearing?", "a": "A 61976 deep-groove ball bearing has a 380 mm bore, 520 mm outer diameter and 65 mm width (14.961 × 20.472 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61976 bore code work?", "a": "The last two digits of 61976 are bore code 76, giving 76 × 5 = 380 mm bore. The 520 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61976 mean?", "a": "A bare 61976 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 380 mm bore?", "a": "619 is a thin section one step above 618: 520×65 mm with a 70.0 mm radial section at 380 mm bore; a 6276 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61976?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6976 — the open (unsealed) execution, 380×520×65 mm per ISO 15. Quoted values: C 360 kN, C0 510 kN, Cu 15.9 kN, mass 39800 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 61976 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61976", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6976" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6076", "brand": "NTN", "manufacturer_designation": "NTN 6076", "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": "steel", "dynamic_load_kN": 505, "static_load_kN": 725, "fatigue_load_limit_kN": 24.1, "limiting_speed_rpm": 990, "weight_g": 67500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6076 carries bore code 76 = 380 mm. Outside diameter 560 mm and width 82 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 380 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 380 mm bore uses a smaller 560 mm OD than a 6276; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6076 has no lubricant retention: grease escapes and contaminants migrate straight into the 380×560×82 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6076 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6076-C3. No clearance suffix means normal CN clearance.", "The open 6076 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 505/725 kN load ratings, 24.1 kN fatigue load limit Cu and 67500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6076; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6076 bearing?", "a": "A 6076 deep-groove ball bearing has a 380 mm bore, 560 mm outer diameter and 82 mm width (14.961 × 22.047 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6076 bore code work?", "a": "The last two digits of 6076 are bore code 76, giving 76 × 5 = 380 mm bore. The 560 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6076 mean?", "a": "A bare 6076 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 380 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (560×82 mm, 90.0 mm radial section) at 380 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6076?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6076 — the open (unsealed) execution, 380×560×82 mm per ISO 15. Quoted values: C 505 kN, C0 725 kN, Cu 24.1 kN, mass 67500 g. Grease limiting speed 990 rpm. The industry-neutral page spelling 6076 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6076", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61880", "brand": "NTN", "manufacturer_designation": "NTN 6880", "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": "steel", "dynamic_load_kN": 251, "static_load_kN": 340, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 1100, "weight_g": 20600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61880 carries bore code 80 = 400 mm. Outside diameter 500 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 400 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 400 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6280.", "The open 61880 has no lubricant retention: grease escapes and contaminants migrate straight into the 400×500×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61880 units.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61880 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 251/340 kN load ratings, 10.6 kN fatigue load limit Cu and 20600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6880; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61880 bearing?", "a": "A 61880 deep-groove ball bearing has a 400 mm bore, 500 mm outer diameter and 46 mm width (15.748 × 19.685 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61880 bore code work?", "a": "The last two digits of 61880 are bore code 80, giving 80 × 5 = 400 mm bore. The 500 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61880 mean?", "a": "A bare 61880 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 400 mm bore?", "a": "618 is an extra-thin section: 500×46 mm, only 50.0 mm radial section at 400 mm bore, far smaller than a 6280, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61880?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6880 — the open (unsealed) execution, 400×500×46 mm per ISO 15. Quoted values: C 251 kN, C0 340 kN, Cu 10.6 kN, mass 20600 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 61880 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61880", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6880" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61980", "brand": "NTN", "manufacturer_designation": "NTN 6980", "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": "steel", "dynamic_load_kN": 370, "static_load_kN": 535, "fatigue_load_limit_kN": 16.4, "limiting_speed_rpm": 990, "weight_g": 41600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61980 carries bore code 80 = 400 mm. Outside diameter 540 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 400 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (70.0 mm section height at 400 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61980 has no lubricant retention: grease escapes and contaminants migrate straight into the 400×540×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61980 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61980 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 370/535 kN load ratings, 16.4 kN fatigue load limit Cu and 41600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6980; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61980 bearing?", "a": "A 61980 deep-groove ball bearing has a 400 mm bore, 540 mm outer diameter and 65 mm width (15.748 × 21.26 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61980 bore code work?", "a": "The last two digits of 61980 are bore code 80, giving 80 × 5 = 400 mm bore. The 540 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61980 mean?", "a": "A bare 61980 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 400 mm bore?", "a": "619 is a thin section one step above 618: 540×65 mm with a 70.0 mm radial section at 400 mm bore; a 6280 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61980?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6980 — the open (unsealed) execution, 400×540×65 mm per ISO 15. Quoted values: C 370 kN, C0 535 kN, Cu 16.4 kN, mass 41600 g. Grease limiting speed 990 rpm. The industry-neutral page spelling 61980 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61980", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6980" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6080", "brand": "NTN", "manufacturer_designation": "NTN 6080", "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": "steel", "dynamic_load_kN": 565, "static_load_kN": 825, "fatigue_load_limit_kN": 26.9, "limiting_speed_rpm": 930, "weight_g": 87600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6080 carries bore code 80 = 400 mm. Outside diameter 600 mm and width 90 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 400 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 400 mm bore uses a smaller 600 mm OD than a 6280; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6080 has no lubricant retention: grease escapes and contaminants migrate straight into the 400×600×90 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6080 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 600 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6080.", "The open 6080 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 565/825 kN load ratings, 26.9 kN fatigue load limit Cu and 87600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6080; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6080 bearing?", "a": "A 6080 deep-groove ball bearing has a 400 mm bore, 600 mm outer diameter and 90 mm width (15.748 × 23.622 × 3.543 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6080 bore code work?", "a": "The last two digits of 6080 are bore code 80, giving 80 × 5 = 400 mm bore. The 600 mm outside diameter and 90 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6080 mean?", "a": "A bare 6080 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 400 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (600×90 mm, 100.0 mm radial section) at 400 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6080?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6080 — the open (unsealed) execution, 400×600×90 mm per ISO 15. Quoted values: C 565 kN, C0 825 kN, Cu 26.9 kN, mass 87600 g. Grease limiting speed 930 rpm. The industry-neutral page spelling 6080 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6080", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61884", "brand": "NTN", "manufacturer_designation": "NTN 6884", "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": "steel", "dynamic_load_kN": 288, "static_load_kN": 405, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 1000, "weight_g": 21600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61884 carries bore code 84 = 420 mm. Outside diameter 520 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 420 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 420 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6284.", "The open 61884 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×520×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61884 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61884-C3. No clearance suffix means normal CN clearance.", "The open 61884 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 288/405 kN load ratings, 12.4 kN fatigue load limit Cu and 21600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6884; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61884 bearing?", "a": "A 61884 deep-groove ball bearing has a 420 mm bore, 520 mm outer diameter and 46 mm width (16.535 × 20.472 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61884 bore code work?", "a": "The last two digits of 61884 are bore code 84, giving 84 × 5 = 420 mm bore. The 520 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61884 mean?", "a": "A bare 61884 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 420 mm bore?", "a": "618 is an extra-thin section: 520×46 mm, only 50.0 mm radial section at 420 mm bore, far smaller than a 6284, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61884?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6884 — the open (unsealed) execution, 420×520×46 mm per ISO 15. Quoted values: C 288 kN, C0 405 kN, Cu 12.4 kN, mass 21600 g. Grease limiting speed 1000 rpm. The industry-neutral page spelling 61884 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61884", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6884" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61984", "brand": "NTN", "manufacturer_designation": "NTN 6984", "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": "steel", "dynamic_load_kN": 380, "static_load_kN": 560, "fatigue_load_limit_kN": 16.8, "limiting_speed_rpm": 940, "weight_g": 43400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61984 carries bore code 84 = 420 mm. Outside diameter 560 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 420 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (70.0 mm section height at 420 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61984 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×560×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61984 units.", "A 420 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61984 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380/560 kN load ratings, 16.8 kN fatigue load limit Cu and 43400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6984; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61984 bearing?", "a": "A 61984 deep-groove ball bearing has a 420 mm bore, 560 mm outer diameter and 65 mm width (16.535 × 22.047 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61984 bore code work?", "a": "The last two digits of 61984 are bore code 84, giving 84 × 5 = 420 mm bore. The 560 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61984 mean?", "a": "A bare 61984 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 420 mm bore?", "a": "619 is a thin section one step above 618: 560×65 mm with a 70.0 mm radial section at 420 mm bore; a 6284 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61984?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6984 — the open (unsealed) execution, 420×560×65 mm per ISO 15. Quoted values: C 380 kN, C0 560 kN, Cu 16.8 kN, mass 43400 g. Grease limiting speed 940 rpm. The industry-neutral page spelling 61984 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61984", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6984" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6084", "brand": "NTN", "manufacturer_designation": "NTN 6084", "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": "steel", "dynamic_load_kN": 590, "static_load_kN": 895, "fatigue_load_limit_kN": 28.3, "limiting_speed_rpm": 880, "weight_g": 91100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6084 carries bore code 84 = 420 mm. Outside diameter 620 mm and width 90 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 420 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 420 mm bore uses a smaller 620 mm OD than a 6284; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6084 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×620×90 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6084 units.", "Shaft and housing fillets must clear the bearing chamfer so the 90 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6084 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 590/895 kN load ratings, 28.3 kN fatigue load limit Cu and 91100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6084; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6084 bearing?", "a": "A 6084 deep-groove ball bearing has a 420 mm bore, 620 mm outer diameter and 90 mm width (16.535 × 24.409 × 3.543 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6084 bore code work?", "a": "The last two digits of 6084 are bore code 84, giving 84 × 5 = 420 mm bore. The 620 mm outside diameter and 90 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6084 mean?", "a": "A bare 6084 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 420 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (620×90 mm, 100.0 mm radial section) at 420 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6084?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6084 — the open (unsealed) execution, 420×620×90 mm per ISO 15. Quoted values: C 590 kN, C0 895 kN, Cu 28.3 kN, mass 91100 g. Grease limiting speed 880 rpm. The industry-neutral page spelling 6084 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6084", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61888", "brand": "NTN", "manufacturer_designation": "NTN 6888", "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": "steel", "dynamic_load_kN": 292, "static_load_kN": 420, "fatigue_load_limit_kN": 12.6, "limiting_speed_rpm": 950, "weight_g": 22500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61888 carries bore code 88 = 440 mm. Outside diameter 540 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 440 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 440 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 440 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6288.", "The open 61888 has no lubricant retention: grease escapes and contaminants migrate straight into the 440×540×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61888 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 540 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61888.", "The open 61888 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 292/420 kN load ratings, 12.6 kN fatigue load limit Cu and 22500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6888; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61888 bearing?", "a": "A 61888 deep-groove ball bearing has a 440 mm bore, 540 mm outer diameter and 46 mm width (17.323 × 21.26 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61888 bore code work?", "a": "The last two digits of 61888 are bore code 88, giving 88 × 5 = 440 mm bore. The 540 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61888 mean?", "a": "A bare 61888 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 440 mm bore?", "a": "618 is an extra-thin section: 540×46 mm, only 50.0 mm radial section at 440 mm bore, far smaller than a 6288, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61888?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6888 — the open (unsealed) execution, 440×540×46 mm per ISO 15. Quoted values: C 292 kN, C0 420 kN, Cu 12.6 kN, mass 22500 g. Grease limiting speed 950 rpm. The industry-neutral page spelling 61888 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61888", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6888" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61988", "brand": "NTN", "manufacturer_designation": "NTN 6988", "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": "steel", "dynamic_load_kN": 405, "static_load_kN": 615, "fatigue_load_limit_kN": 18, "limiting_speed_rpm": 890, "weight_g": 60000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61988 carries bore code 88 = 440 mm. Outside diameter 600 mm and width 74 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 440 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 440 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (80.0 mm section height at 440 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61988 has no lubricant retention: grease escapes and contaminants migrate straight into the 440×600×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61988 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61988 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 405/615 kN load ratings, 18 kN fatigue load limit Cu and 60000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6988; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61988 bearing?", "a": "A 61988 deep-groove ball bearing has a 440 mm bore, 600 mm outer diameter and 74 mm width (17.323 × 23.622 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61988 bore code work?", "a": "The last two digits of 61988 are bore code 88, giving 88 × 5 = 440 mm bore. The 600 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61988 mean?", "a": "A bare 61988 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 440 mm bore?", "a": "619 is a thin section one step above 618: 600×74 mm with a 80.0 mm radial section at 440 mm bore; a 6288 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61988?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6988 — the open (unsealed) execution, 440×600×74 mm per ISO 15. Quoted values: C 405 kN, C0 615 kN, Cu 18 kN, mass 60000 g. Grease limiting speed 890 rpm. The industry-neutral page spelling 61988 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61988", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6988" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61892", "brand": "NTN", "manufacturer_designation": "NTN 6892", "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": "steel", "dynamic_load_kN": 350, "static_load_kN": 515, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 900, "weight_g": 34800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61892 carries bore code 92 = 460 mm. Outside diameter 580 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 460 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 460 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 460 mm bore has only a 60.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6292.", "The open 61892 has no lubricant retention: grease escapes and contaminants migrate straight into the 460×580×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61892 units.", "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61892 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 350/515 kN load ratings, 15.1 kN fatigue load limit Cu and 34800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6892; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61892 bearing?", "a": "A 61892 deep-groove ball bearing has a 460 mm bore, 580 mm outer diameter and 56 mm width (18.11 × 22.835 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61892 bore code work?", "a": "The last two digits of 61892 are bore code 92, giving 92 × 5 = 460 mm bore. The 580 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61892 mean?", "a": "A bare 61892 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 460 mm bore?", "a": "618 is an extra-thin section: 580×56 mm, only 60.0 mm radial section at 460 mm bore, far smaller than a 6292, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61892?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6892 — the open (unsealed) execution, 460×580×56 mm per ISO 15. Quoted values: C 350 kN, C0 515 kN, Cu 15.1 kN, mass 34800 g. Grease limiting speed 900 rpm. The industry-neutral page spelling 61892 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61892", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6892" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61992", "brand": "NTN", "manufacturer_designation": "NTN 6992", "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": "steel", "dynamic_load_kN": 415, "static_load_kN": 645, "fatigue_load_limit_kN": 18.5, "limiting_speed_rpm": 850, "weight_g": 62200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61992 carries bore code 92 = 460 mm. Outside diameter 620 mm and width 74 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 460 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 460 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (80.0 mm section height at 460 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61992 has no lubricant retention: grease escapes and contaminants migrate straight into the 460×620×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61992 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61992 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 415/645 kN load ratings, 18.5 kN fatigue load limit Cu and 62200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6992; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61992 bearing?", "a": "A 61992 deep-groove ball bearing has a 460 mm bore, 620 mm outer diameter and 74 mm width (18.11 × 24.409 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61992 bore code work?", "a": "The last two digits of 61992 are bore code 92, giving 92 × 5 = 460 mm bore. The 620 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61992 mean?", "a": "A bare 61992 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 460 mm bore?", "a": "619 is a thin section one step above 618: 620×74 mm with a 80.0 mm radial section at 460 mm bore; a 6292 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61992?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6992 — the open (unsealed) execution, 460×620×74 mm per ISO 15. Quoted values: C 415 kN, C0 645 kN, Cu 18.5 kN, mass 62200 g. Grease limiting speed 850 rpm. The industry-neutral page spelling 61992 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61992", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6992" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61896", "brand": "NTN", "manufacturer_designation": "NTN 6896", "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": "steel", "dynamic_load_kN": 355, "static_load_kN": 540, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 860, "weight_g": 36200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61896 carries bore code 96 = 480 mm. Outside diameter 600 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 480 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 480 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 480 mm bore has only a 60.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6296.", "The open 61896 has no lubricant retention: grease escapes and contaminants migrate straight into the 480×600×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61896 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61896-C3. No clearance suffix means normal CN clearance.", "The open 61896 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 355/540 kN load ratings, 15.4 kN fatigue load limit Cu and 36200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6896; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61896 bearing?", "a": "A 61896 deep-groove ball bearing has a 480 mm bore, 600 mm outer diameter and 56 mm width (18.898 × 23.622 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61896 bore code work?", "a": "The last two digits of 61896 are bore code 96, giving 96 × 5 = 480 mm bore. The 600 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61896 mean?", "a": "A bare 61896 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 480 mm bore?", "a": "618 is an extra-thin section: 600×56 mm, only 60.0 mm radial section at 480 mm bore, far smaller than a 6296, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61896?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6896 — the open (unsealed) execution, 480×600×56 mm per ISO 15. Quoted values: C 355 kN, C0 540 kN, Cu 15.4 kN, mass 36200 g. Grease limiting speed 860 rpm. The industry-neutral page spelling 61896 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61896", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6896" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61996", "brand": "NTN", "manufacturer_designation": "NTN 6996", "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": "steel", "dynamic_load_kN": 480, "static_load_kN": 770, "fatigue_load_limit_kN": 21.5, "limiting_speed_rpm": 810, "weight_g": 73000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61996 carries bore code 96 = 480 mm. Outside diameter 650 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 480 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 480 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (85.0 mm section height at 480 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61996 has no lubricant retention: grease escapes and contaminants migrate straight into the 480×650×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61996 units.", "A 480 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61996 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 480/770 kN load ratings, 21.5 kN fatigue load limit Cu and 73000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6996; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61996 bearing?", "a": "A 61996 deep-groove ball bearing has a 480 mm bore, 650 mm outer diameter and 78 mm width (18.898 × 25.591 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61996 bore code work?", "a": "The last two digits of 61996 are bore code 96, giving 96 × 5 = 480 mm bore. The 650 mm outside diameter and 78 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61996 mean?", "a": "A bare 61996 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 480 mm bore?", "a": "619 is a thin section one step above 618: 650×78 mm with a 85.0 mm radial section at 480 mm bore; a 6296 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61996?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6996 — the open (unsealed) execution, 480×650×78 mm per ISO 15. Quoted values: C 480 kN, C0 770 kN, Cu 21.5 kN, mass 73000 g. Grease limiting speed 810 rpm. The industry-neutral page spelling 61996 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61996", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6996" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6200", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 31, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "The open 6200 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6200 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6200 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6200-2Z (shields) and 6200-2RSH (contact seals), not suffix-free 6200.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200 bearing?", "a": "A 6200 deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 29 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6200 mean?", "a": "A bare 6200 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 10 mm bore?", "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6300 on the same bore is larger and higher-rated; a 6000 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6200?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200 — the open (unsealed) execution, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 36000 r/min, mass 31 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6200." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7200", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6200", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6200-2Z.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6200-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6200-2RS for that.", "Shielded 6200-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6200-2Z (one shield: 6200-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6200-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6200-2Z for high-contamination positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-ZZ bearing?", "a": "A 6200-ZZ deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 29 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6200-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 10 mm bore?", "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6300 on the same bore is larger and higher-rated; a 6000 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6200-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2Z — two non-contact sheet-metal shields, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 28000 r/min, mass 34 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6200-ZZ." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7200", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6200-2Z", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6200-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6200-2RS runs slower and cooler-limited than the open 6200; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6200-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6200-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed. The single-seal catalogue number is 6200-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6200-RSH exists for arrangements that lubricate through the open side; fitting 6200-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-2RS bearing?", "a": "A 6200-2RS deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 29 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6200-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 10 mm bore?", "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6300 on the same bore is larger and higher-rated; a 6000 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6200-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2RSH — two contact elastomer seals over a lifetime grease fill, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 17000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6200-2RS." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7200", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6200-2RSH", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "The open 6201 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6201 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6201.", "The open 6201 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6201-2Z (shields) and 6201-2RSH (contact seals), not suffix-free 6201.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201 bearing?", "a": "A 6201 deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6201 mean?", "a": "A bare 6201 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 12 mm bore?", "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6301 on the same bore is larger and higher-rated; a 6001 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6201?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201 — the open (unsealed) execution, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 32000 r/min, mass 37 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6201." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7201", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6201", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6201-2Z.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6201-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6201-2RS for that.", "Shielded 6201-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6201-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6201-2Z (one shield: 6201-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6201-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6201-2Z for high-contamination positions.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-ZZ bearing?", "a": "A 6201-ZZ deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6201-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 12 mm bore?", "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6301 on the same bore is larger and higher-rated; a 6001 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6201-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2Z — two non-contact sheet-metal shields, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 26000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6201-ZZ." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7201", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6201-2Z", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6201-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6201-2RS runs slower and cooler-limited than the open 6201; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6201-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6201-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 15000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6201-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6201-RSH exists for arrangements that lubricate through the open side; fitting 6201-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-2RS bearing?", "a": "A 6201-2RS deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6201-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 12 mm bore?", "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6301 on the same bore is larger and higher-rated; a 6001 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6201-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2RSH — two contact elastomer seals over a lifetime grease fill, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 15000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6201-2RS." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7201", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6201-2RSH", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "The open 6202 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6202 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6202 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6202-2Z (shields) and 6202-2RSH (contact seals), not suffix-free 6202.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202 bearing?", "a": "A 6202 deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 44 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6202 mean?", "a": "A bare 6202 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202 — the open (unsealed) execution, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 28000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6202." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7202", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6202", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 48, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6202-2Z.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6202-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6202-2RS for that.", "Shielded 6202-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6202-2Z (one shield: 6202-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6202-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6202-2Z for high-contamination positions.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-ZZ bearing?", "a": "A 6202-ZZ deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 44 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6202-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2Z — two non-contact sheet-metal shields, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 22000 r/min, mass 48 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6202-ZZ." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7202", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6202-2Z", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 46, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6202-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6202-2RS runs slower and cooler-limited than the open 6202; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6202-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6202-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 43000 r/min thermal reference speed. The single-seal catalogue number is 6202-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6202-RSH exists for arrangements that lubricate through the open side; fitting 6202-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-2RS bearing?", "a": "A 6202-2RS deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 44 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6202-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2RSH — two contact elastomer seals over a lifetime grease fill, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 13000 r/min, mass 46 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6202-2RS." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7202", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6202-2RSH", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 65, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6303 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "The open 6203 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6203 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6203-C3. No clearance suffix means normal CN clearance.", "The open 6203 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6203-2Z (shields) and 6203-2RSH (contact seals), not suffix-free 6203.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203 bearing?", "a": "A 6203 deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 63 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6203 mean?", "a": "A bare 6203 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with a 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6203?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203 — the open (unsealed) execution, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 24000 r/min, mass 65 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6203." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7203", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6203", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 68, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6203-2Z.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6303 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6203-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6203-2RS for that.", "Shielded 6203-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6203-2Z (one shield: 6203-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6203-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6203-2Z for high-contamination positions.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-ZZ bearing?", "a": "A 6203-ZZ deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 63 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6203-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with a 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6203-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2Z — two non-contact sheet-metal shields, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 19000 r/min, mass 68 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6203-ZZ." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7203", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6203-2Z", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6203-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6303 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6203-2RS runs slower and cooler-limited than the open 6203; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6203-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 40 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6203-2RS.", "SKF catalogues the contact-sealed version as 6203-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6203-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6203-RSH exists for arrangements that lubricate through the open side; fitting 6203-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-2RS bearing?", "a": "A 6203-2RS deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 63 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6203-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with a 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6203-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2RSH — two contact elastomer seals over a lifetime grease fill, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 12000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6203-2RS." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7203", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6203-2RSH", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "The open 6204 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6204 units.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6204 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6204-2Z (shields) and 6204-2RSH (contact seals), not suffix-free 6204.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204 bearing?", "a": "A 6204 deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 101 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6204 mean?", "a": "A bare 6204 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204 — the open (unsealed) execution, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 20000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6204." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7204", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6204", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6204-2Z.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6204-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6204-2RS for that.", "Shielded 6204-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6204-2Z (one shield: 6204-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6204-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6204-2Z for high-contamination positions.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-ZZ bearing?", "a": "A 6204-ZZ deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 101 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6204-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2Z — two non-contact sheet-metal shields, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 17000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6204-ZZ." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7204", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6204-2Z", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6204-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6204-2RS runs slower and cooler-limited than the open 6204; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6204-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6204-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 10000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed. The single-seal catalogue number is 6204-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6204-RSH exists for arrangements that lubricate through the open side; fitting 6204-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-2RS bearing?", "a": "A 6204-2RS deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 101 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6204-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2RSH — two contact elastomer seals over a lifetime grease fill, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 10000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6204-2RS." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7204", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6204-2RSH", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "The open 6205 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6205 units.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6205 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6205-2Z (shields) and 6205-2RSH (contact seals), not suffix-free 6205.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205 bearing?", "a": "A 6205 deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6205 mean?", "a": "A bare 6205 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6205?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205 — the open (unsealed) execution, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 18000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6205." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7205", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6205", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6205-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6205-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6205-2RS for that.", "Shielded 6205-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6205-ZZ.", "SKF spells the shielded version 6205-2Z (one shield: 6205-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6205-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6205-2Z for high-contamination positions.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-ZZ bearing?", "a": "A 6205-ZZ deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6205-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6205-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2Z — two non-contact sheet-metal shields, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 14000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6205-ZZ." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7205", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6205-2Z", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6205-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6205-2RS runs slower and cooler-limited than the open 6205; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6205-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6205-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6205-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 28000 r/min thermal reference speed. The single-seal catalogue number is 6205-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6205-RSH exists for arrangements that lubricate through the open side; fitting 6205-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-2RS bearing?", "a": "A 6205-2RS deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6205-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6205-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2RSH — two contact elastomer seals over a lifetime grease fill, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 8500 r/min, mass 130 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6205-2RS." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7205", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6205-2RSH", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "The open 6206 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×62×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6206 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6206 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6206-2Z (shields) and 6206-2RSH (contact seals), not suffix-free 6206.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206 bearing?", "a": "A 6206 deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 189 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6206 mean?", "a": "A bare 6206 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206 — the open (unsealed) execution, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 15000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6206." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7206", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6206", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6206-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6206-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6206-2RS for that.", "Shielded 6206-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6206-2Z (one shield: 6206-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6206-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6206-2Z for high-contamination positions.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-ZZ bearing?", "a": "A 6206-ZZ deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 189 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6206-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2Z — two non-contact sheet-metal shields, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 12000 r/min, mass 210 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6206-ZZ." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7206", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6206-2Z", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6206-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6206-2RS runs slower and cooler-limited than the open 6206; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6206-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6206-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6206-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6206-RSH exists for arrangements that lubricate through the open side; fitting 6206-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-2RS bearing?", "a": "A 6206-2RS deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 189 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6206-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2RSH — two contact elastomer seals over a lifetime grease fill, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 7500 r/min, mass 210 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6206-2RS." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7206", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6206-2RSH", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "The open 6207 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6207 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6207.", "The open 6207 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6207-2Z (shields) and 6207-2RSH (contact seals), not suffix-free 6207.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207 bearing?", "a": "A 6207 deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 270 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6207 mean?", "a": "A bare 6207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with a 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6207?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207 — the open (unsealed) execution, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 13000 r/min, mass 290 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6207." } ], "cross_ref": [ { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7207", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6207", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6207-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6207-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6207-2RS for that.", "Shielded 6207-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6207-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6207-2Z (one shield: 6207-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6207-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6207-2Z for high-contamination positions.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207-ZZ bearing?", "a": "A 6207-ZZ deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 270 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6207-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with a 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6207-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207-2Z — two non-contact sheet-metal shields, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 10000 r/min, mass 300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6207-ZZ." } ], "cross_ref": [ { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7207", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6207-2Z", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6207-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6207-2RS runs slower and cooler-limited than the open 6207; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6207-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 17 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6207-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6207-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6207-RSH exists for arrangements that lubricate through the open side; fitting 6207-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207-2RS bearing?", "a": "A 6207-2RS deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 270 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6207-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with a 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6207-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207-2RSH — two contact elastomer seals over a lifetime grease fill, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 6300 r/min, mass 300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6207-2RS." } ], "cross_ref": [ { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7207", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6207-2RSH", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "The open 6208 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×80×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6208 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6208 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6208-2Z (shields) and 6208-2RSH (contact seals), not suffix-free 6208.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208 bearing?", "a": "A 6208 deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 346 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6208 mean?", "a": "A bare 6208 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6208?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208 — the open (unsealed) execution, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 11000 r/min, mass 370 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6208." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7208", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6208", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6208-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6208-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6208-2RS for that.", "Shielded 6208-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6208-2Z (one shield: 6208-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6208-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6208-2Z for high-contamination positions.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-ZZ bearing?", "a": "A 6208-ZZ deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 346 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6208-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6208-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2Z — two non-contact sheet-metal shields, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 9000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6208-ZZ." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7208", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6208-2Z", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6208-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6208-2RS runs slower and cooler-limited than the open 6208; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6208-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6208-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 18000 r/min thermal reference speed. The single-seal catalogue number is 6208-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6208-RSH exists for arrangements that lubricate through the open side; fitting 6208-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-2RS bearing?", "a": "A 6208-2RS deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 346 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6208-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6208-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2RSH — two contact elastomer seals over a lifetime grease fill, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 5600 r/min, mass 370 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6208-2RS." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7208", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6208-2RSH", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "The open 6209 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×85×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6209 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6209-C3. No clearance suffix means normal CN clearance.", "The open 6209 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6209-2Z (shields) and 6209-2RSH (contact seals), not suffix-free 6209.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209 bearing?", "a": "A 6209 deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 396 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6209 mean?", "a": "A bare 6209 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6209?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209 — the open (unsealed) execution, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.915 kN, limiting speed 11000 r/min, mass 420 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6209." } ], "cross_ref": [ { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7209", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6209", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6209-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6209-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6209-2RS for that.", "Shielded 6209-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6209-2Z (one shield: 6209-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6209-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6209-2Z for high-contamination positions.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209-ZZ bearing?", "a": "A 6209-ZZ deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 396 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6209-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6209-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209-2Z — two non-contact sheet-metal shields, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.92 kN, limiting speed 8500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6209-ZZ." } ], "cross_ref": [ { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7209", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6209-2Z", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.92, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6209-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6209-2RS runs slower and cooler-limited than the open 6209; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6209-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 85 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6209-2RS.", "SKF catalogues the contact-sealed version as 6209-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed. The single-seal catalogue number is 6209-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6209-RSH exists for arrangements that lubricate through the open side; fitting 6209-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209-2RS bearing?", "a": "A 6209-2RS deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 396 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6209-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6209-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209-2RSH — two contact elastomer seals over a lifetime grease fill, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.915 kN, limiting speed 5000 r/min, mass 420 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6209-2RS." } ], "cross_ref": [ { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7209", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6209-2RSH", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "The open 6210 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×90×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6210 units.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6210 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6210-2Z (shields) and 6210-2RSH (contact seals), not suffix-free 6210.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210 bearing?", "a": "A 6210 deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 449 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6210 mean?", "a": "A bare 6210 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210 — the open (unsealed) execution, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 10000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6210." } ], "cross_ref": [ { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7210", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6210", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 470, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6210-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6210-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6210-2RS for that.", "Shielded 6210-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6210-2Z (one shield: 6210-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6210-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6210-2Z for high-contamination positions.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210-ZZ bearing?", "a": "A 6210-ZZ deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 449 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6210-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210-2Z — two non-contact sheet-metal shields, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 8000 r/min, mass 470 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6210-ZZ." } ], "cross_ref": [ { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7210", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6210-2Z", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6210-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6210-2RS runs slower and cooler-limited than the open 6210; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6210-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6210-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6210-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6210-RSH exists for arrangements that lubricate through the open side; fitting 6210-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210-2RS bearing?", "a": "A 6210-2RS deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 449 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6210-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210-2RSH — two contact elastomer seals over a lifetime grease fill, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 4800 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6210-2RS." } ], "cross_ref": [ { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7210", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6210-2RSH", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "The open 6211 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×100×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6211 units.", "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6211 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6211-2Z (shields) and 6211-2RSH (contact seals), not suffix-free 6211.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211 bearing?", "a": "A 6211 deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 587 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6211 bore code work?", "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6211 mean?", "a": "A bare 6211 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6211?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211 — the open (unsealed) execution, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 9000 r/min, mass 610 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6211." } ], "cross_ref": [ { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7211", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6211", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6211-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6211-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6211-2RS for that.", "Shielded 6211-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6211-ZZ.", "SKF spells the shielded version 6211-2Z (one shield: 6211-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6211-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6211-2Z for high-contamination positions.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211-ZZ bearing?", "a": "A 6211-ZZ deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 587 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6211 bore code work?", "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6211-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6211-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211-2Z — two non-contact sheet-metal shields, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 7000 r/min, mass 640 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6211-ZZ." } ], "cross_ref": [ { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7211", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6211-2Z", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 620, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6211-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6211-2RS runs slower and cooler-limited than the open 6211; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6211-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6211-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6211-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed. The single-seal catalogue number is 6211-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6211-RSH exists for arrangements that lubricate through the open side; fitting 6211-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211-2RS bearing?", "a": "A 6211-2RS deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 587 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6211 bore code work?", "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6211-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6211-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211-2RSH — two contact elastomer seals over a lifetime grease fill, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 4300 r/min, mass 620 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6211-2RS." } ], "cross_ref": [ { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7211", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6211-2RSH", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 780, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "The open 6212 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6212 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6212 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6212-2Z (shields) and 6212-2RSH (contact seals), not suffix-free 6212.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212 bearing?", "a": "A 6212 deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 749 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6212 mean?", "a": "A bare 6212 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6212?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212 — the open (unsealed) execution, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 8000 r/min, mass 780 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6212." } ], "cross_ref": [ { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7212", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6212", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 810, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6212-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6212-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6212-2RS for that.", "Shielded 6212-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6212-2Z (one shield: 6212-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6212-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6212-2Z for high-contamination positions.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212-ZZ bearing?", "a": "A 6212-ZZ deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 749 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6212-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6212-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212-2Z — two non-contact sheet-metal shields, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 6300 r/min, mass 810 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6212-ZZ." } ], "cross_ref": [ { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7212", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6212-2Z", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 790, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6212-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6212-2RS runs slower and cooler-limited than the open 6212; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6212-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6212-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6212-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6212-RSH exists for arrangements that lubricate through the open side; fitting 6212-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212-2RS bearing?", "a": "A 6212-2RS deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 749 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6212-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6212-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212-2RSH — two contact elastomer seals over a lifetime grease fill, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 4000 r/min, mass 790 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6212-2RS." } ], "cross_ref": [ { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7212", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6212-2RSH", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6213", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "The open 6213 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×120×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6213 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6213.", "The open 6213 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6213-2Z (shields) and 6213-2RSH (contact seals), not suffix-free 6213.", "The 58.5/40.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6213 bearing?", "a": "A 6213 deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 938 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6213 mean?", "a": "A bare 6213 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6213?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6213 — the open (unsealed) execution, 65×120×23 mm per ISO 15. Quoted values: C 58.5 kN, C0 40.5 kN, Pu 1.73 kN, limiting speed 7500 r/min, mass 1000 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6213." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7213", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6213", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6213-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6213-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6213-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6213-2RS for that.", "Shielded 6213-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6213-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6213-2Z (one shield: 6213-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6213-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6213-2Z for high-contamination positions.", "The 58.5/40.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6213-ZZ bearing?", "a": "A 6213-ZZ deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 938 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6213-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6213-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6213-2Z — two non-contact sheet-metal shields, 65×120×23 mm per ISO 15. Quoted values: C 58.5 kN, C0 40.5 kN, Pu 1.73 kN, limiting speed 6000 r/min, mass 1050 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6213-ZZ." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7213", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6213-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6213-2Z", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "The open 6214 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×125×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6214 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6214 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6214-2Z (shields) and 6214-2RSH (contact seals), not suffix-free 6214.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214 bearing?", "a": "A 6214 deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1032 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6214 mean?", "a": "A bare 6214 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6214?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214 — the open (unsealed) execution, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 7000 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6214." } ], "cross_ref": [ { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7214", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6214", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6214-2Z.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6214-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6214-2RS for that.", "Shielded 6214-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6214-2Z (one shield: 6214-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6214-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6214-2Z for high-contamination positions.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214-ZZ bearing?", "a": "A 6214-ZZ deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1032 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6214-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6214-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214-2Z — two non-contact sheet-metal shields, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 5600 r/min, mass 1150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6214-ZZ." } ], "cross_ref": [ { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7214", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6214-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6214-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6214-2RS runs slower and cooler-limited than the open 6214; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6214-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6214-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6214-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6214-RS1 exists for arrangements that lubricate through the open side; fitting 6214-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214-2RS bearing?", "a": "A 6214-2RS deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1032 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6214-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6214-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 3400 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6214-2RS." } ], "cross_ref": [ { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7214", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6214-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "The open 6215 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×130×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6215 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6215-C3. No clearance suffix means normal CN clearance.", "The open 6215 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6215-2Z (shields) and 6215-2RSH (contact seals), not suffix-free 6215.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215 bearing?", "a": "A 6215 deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1130 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6215 mean?", "a": "A bare 6215 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6215?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215 — the open (unsealed) execution, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 6700 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6215." } ], "cross_ref": [ { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7215", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6215", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6215-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6215-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6215-2RS for that.", "Shielded 6215-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6215-2Z (one shield: 6215-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6215-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6215-2Z for high-contamination positions.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215-ZZ bearing?", "a": "A 6215-ZZ deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1130 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6215-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6215-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215-2Z — two non-contact sheet-metal shields, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 5300 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6215-ZZ." } ], "cross_ref": [ { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7215", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6215-2Z", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6215-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6215-2RS runs slower and cooler-limited than the open 6215; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6215-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6215-2RS.", "SKF catalogues the contact-sealed version as 6215-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6215-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6215-RS1 exists for arrangements that lubricate through the open side; fitting 6215-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215-2RS bearing?", "a": "A 6215-2RS deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1130 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6215-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6215-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 3200 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6215-2RS." } ], "cross_ref": [ { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7215", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6215-2RS1", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "The open 6216 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6216 units.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6216 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6216-2Z (shields) and 6216-2RSH (contact seals), not suffix-free 6216.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216 bearing?", "a": "A 6216 deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1375 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6216 mean?", "a": "A bare 6216 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216 — the open (unsealed) execution, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 6000 r/min, mass 1450 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6216." } ], "cross_ref": [ { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7216", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6216", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6216-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6216-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6216-2RS for that.", "Shielded 6216-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6216-2Z (one shield: 6216-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6216-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6216-2Z for high-contamination positions.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216-ZZ bearing?", "a": "A 6216-ZZ deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1375 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6216-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216-2Z — two non-contact sheet-metal shields, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 4800 r/min, mass 1550 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6216-ZZ." } ], "cross_ref": [ { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7216", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6216-2Z", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6216-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6216-2RS runs slower and cooler-limited than the open 6216; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6216-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6216-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6216-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6216-RS1 exists for arrangements that lubricate through the open side; fitting 6216-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216-2RS bearing?", "a": "A 6216-2RS deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1375 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6216-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 3000 r/min, mass 1500 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6216-2RS." } ], "cross_ref": [ { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7216", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6216-2RS1", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "The open 6217 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×150×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6217 units.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6217 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6217-2Z (shields) and 6217-2RSH (contact seals), not suffix-free 6217.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217 bearing?", "a": "A 6217 deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1714 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6217 mean?", "a": "A bare 6217 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6217?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217 — the open (unsealed) execution, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 5600 r/min, mass 1800 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6217." } ], "cross_ref": [ { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7217", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6217", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6217-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6217-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6217-2RS for that.", "Shielded 6217-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6217-ZZ.", "SKF spells the shielded version 6217-2Z (one shield: 6217-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6217-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6217-2Z for high-contamination positions.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217-ZZ bearing?", "a": "A 6217-ZZ deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1714 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6217-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6217-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217-2Z — two non-contact sheet-metal shields, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 4500 r/min, mass 1900 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6217-ZZ." } ], "cross_ref": [ { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7217", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6217-2Z", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6217-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6217-2RS runs slower and cooler-limited than the open 6217; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6217-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6217-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6217-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9000 r/min thermal reference speed. The single-seal catalogue number is 6217-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6217-RS1 exists for arrangements that lubricate through the open side; fitting 6217-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217-2RS bearing?", "a": "A 6217-2RS deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1714 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6217-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6217-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 2800 r/min, mass 1900 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6217-2RS." } ], "cross_ref": [ { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7217", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6217-2RS1", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "The open 6218 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×160×30 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6218 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6218 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6218-2Z (shields) and 6218-2RSH (contact seals), not suffix-free 6218.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218 bearing?", "a": "A 6218 deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2104 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6218 mean?", "a": "A bare 6218 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6218?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218 — the open (unsealed) execution, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 5300 r/min, mass 2200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6218." } ], "cross_ref": [ { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7218", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6218", "material": "GCr15", "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, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6218-2Z.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6218-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6218-2RS for that.", "Shielded 6218-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6218-2Z (one shield: 6218-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6218-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6218-2Z for high-contamination positions.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218-ZZ bearing?", "a": "A 6218-ZZ deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2104 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6218-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6218-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218-2Z — two non-contact sheet-metal shields, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 4300 r/min, mass 2300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6218-ZZ." } ], "cross_ref": [ { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7218", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6218-2Z", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6218-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6218-2RS runs slower and cooler-limited than the open 6218; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6218-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6218-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6218-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6218-RS1 exists for arrangements that lubricate through the open side; fitting 6218-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218-2RS bearing?", "a": "A 6218-2RS deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2104 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6218-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6218-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 2600 r/min, mass 2300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6218-2RS." } ], "cross_ref": [ { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7218", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6218-2RS1", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "The open 6219 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×32 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6219 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6219.", "The open 6219 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6219-2Z (shields) and 6219-2RSH (contact seals), not suffix-free 6219.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219 bearing?", "a": "A 6219 deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2549 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6219 mean?", "a": "A bare 6219 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6219?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219 — the open (unsealed) execution, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 5000 r/min, mass 2650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6219." } ], "cross_ref": [ { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7219", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6219", "material": "GCr15", "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, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6219-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6219-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6219-2RS for that.", "Shielded 6219-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6219-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6219-2Z (one shield: 6219-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6219-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6219-2Z for high-contamination positions.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219-ZZ bearing?", "a": "A 6219-ZZ deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2549 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6219-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6219-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219-2Z — two non-contact sheet-metal shields, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 4000 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6219-ZZ." } ], "cross_ref": [ { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7219", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6219-2Z", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6219-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6219-2RS runs slower and cooler-limited than the open 6219; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6219-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 32 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6219-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6219-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6219-RS1 exists for arrangements that lubricate through the open side; fitting 6219-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219-2RS bearing?", "a": "A 6219-2RS deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2549 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6219-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6219-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 2400 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6219-2RS." } ], "cross_ref": [ { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7219", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6219-2RS1", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "The open 6220 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×180×34 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6220 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6220 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6220-2Z (shields) and 6220-2RSH (contact seals), not suffix-free 6220.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220 bearing?", "a": "A 6220 deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 3052 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6220 bore code work?", "a": "The last two digits of 6220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6220 mean?", "a": "A bare 6220 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6220?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220 — the open (unsealed) execution, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 4800 r/min, mass 3200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6220." } ], "cross_ref": [ { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7220", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6220", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6220-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6220-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6220-2RS for that.", "Shielded 6220-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6220-2Z (one shield: 6220-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6220-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6220-2Z for high-contamination positions.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220-ZZ bearing?", "a": "A 6220-ZZ deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 3052 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6220 bore code work?", "a": "The last two digits of 6220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6220-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6220-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220-2Z — two non-contact sheet-metal shields, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 3800 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6220-ZZ." } ], "cross_ref": [ { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7220", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6220-2Z", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6220-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6220-2RS runs slower and cooler-limited than the open 6220; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6220-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6220-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6220-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6220-RS1 exists for arrangements that lubricate through the open side; fitting 6220-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220-2RS bearing?", "a": "A 6220-2RS deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 3052 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6220 bore code work?", "a": "The last two digits of 6220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6220-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6220-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 2400 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6220-2RS." } ], "cross_ref": [ { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7220", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6220-2RS1", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6221", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "The open 6221 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×190×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6221 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6221-C3. No clearance suffix means normal CN clearance.", "The open 6221 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6221-2Z (shields) and 6221-2RSH (contact seals), not suffix-free 6221.", "The 140/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6221 bearing?", "a": "A 6221 deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 3618 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6221 mean?", "a": "A bare 6221 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6221?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6221 — the open (unsealed) execution, 105×190×36 mm per ISO 15. Quoted values: C 140 kN, C0 104 kN, Pu 3.65 kN, limiting speed 4500 r/min, mass 3800 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6221." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7221", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6221", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 104, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6221-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6221-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6221-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6221-2RS for that.", "Shielded 6221-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6221-2Z (one shield: 6221-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6221-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6221-2Z for high-contamination positions.", "The 140/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6221-ZZ bearing?", "a": "A 6221-ZZ deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 3618 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6221-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6221-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6221-2Z — two non-contact sheet-metal shields, 105×190×36 mm per ISO 15. Quoted values: C 140 kN, C0 104 kN, Pu 3.65 kN, limiting speed 3600 r/min, mass 3900 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6221-ZZ." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7221", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6221-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6221-2Z", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 104, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "The open 6222 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×200×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6222 units.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6222 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6222-2Z (shields) and 6222-2RSH (contact seals), not suffix-free 6222.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222 bearing?", "a": "A 6222 deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 4249 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6222 mean?", "a": "A bare 6222 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6222?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222 — the open (unsealed) execution, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 4300 r/min, mass 4450 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6222." } ], "cross_ref": [ { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7222", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6222", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6222-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6222-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6222-2RS for that.", "Shielded 6222-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6222-2Z (one shield: 6222-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6222-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6222-2Z for high-contamination positions.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222-ZZ bearing?", "a": "A 6222-ZZ deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 4249 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6222-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6222-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222-2Z — two non-contact sheet-metal shields, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 3400 r/min, mass 4600 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6222-ZZ." } ], "cross_ref": [ { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7222", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6222-2Z", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6222-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6222-2RS runs slower and cooler-limited than the open 6222; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6222-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6222-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6700 r/min thermal reference speed. The single-seal catalogue number is 6222-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6222-RS1 exists for arrangements that lubricate through the open side; fitting 6222-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222-2RS bearing?", "a": "A 6222-2RS deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 4249 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6222-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6222-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 2000 r/min, mass 4600 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6222-2RS." } ], "cross_ref": [ { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7222", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6222-2RS1", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "limiting_speed_rpm": 2000, "max_rpm": 2000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "The open 6300 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6300 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6300.", "The open 6300 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6300-2Z (shields) and 6300-2RSH (contact seals), not suffix-free 6300.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300 bearing?", "a": "A 6300 deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 50 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6300 mean?", "a": "A bare 6300 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6300?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300 — the open (unsealed) execution, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 32000 r/min, mass 53 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6300." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7300", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6300", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 55, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6300-2Z.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "ZZ shields are non-contact: 6300-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6300-2RS for that.", "Shielded 6300-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6300-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6300-2Z (one shield: 6300-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6300-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6300-2Z for high-contamination positions.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-ZZ bearing?", "a": "A 6300-ZZ deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 50 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6300-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6300-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2Z — two non-contact sheet-metal shields, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 26000 r/min, mass 55 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6300-ZZ." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7300", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6300-2Z", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 54, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6300-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "Contact seals add drag and heat: 6300-2RS runs slower and cooler-limited than the open 6300; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6300-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6300-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 15000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6300-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6300-RSH exists for arrangements that lubricate through the open side; fitting 6300-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-2RS bearing?", "a": "A 6300-2RS deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 50 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6300-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6300-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2RSH — two contact elastomer seals over a lifetime grease fill, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 15000 r/min, mass 54 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6300-2RS." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7300", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6300-2RSH", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 60, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "The open 6301 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×37×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6301 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6301 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6301-2Z (shields) and 6301-2RSH (contact seals), not suffix-free 6301.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301 bearing?", "a": "A 6301 deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 59 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6301 mean?", "a": "A bare 6301 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301 — the open (unsealed) execution, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 28000 r/min, mass 60 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6301." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7301", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6301", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 63, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6301-2Z.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "ZZ shields are non-contact: 6301-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6301-2RS for that.", "Shielded 6301-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6301-2Z (one shield: 6301-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6301-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6301-2Z for high-contamination positions.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-ZZ bearing?", "a": "A 6301-ZZ deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 59 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6301-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2Z — two non-contact sheet-metal shields, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 22000 r/min, mass 63 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6301-ZZ." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7301", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6301-2Z", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 62, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6301-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "Contact seals add drag and heat: 6301-2RS runs slower and cooler-limited than the open 6301; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6301-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6301-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed. The single-seal catalogue number is 6301-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6301-RSH exists for arrangements that lubricate through the open side; fitting 6301-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-2RS bearing?", "a": "A 6301-2RS deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 59 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6301-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2RSH — two contact elastomer seals over a lifetime grease fill, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 14000 r/min, mass 62 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6301-2RS." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7301", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6301-2RSH", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 82, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "The open 6302 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×42×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6302 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6302-C3. No clearance suffix means normal CN clearance.", "The open 6302 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6302-2Z (shields) and 6302-2RSH (contact seals), not suffix-free 6302.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302 bearing?", "a": "A 6302 deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 80 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6302 mean?", "a": "A bare 6302 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6302?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302 — the open (unsealed) execution, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 24000 r/min, mass 82 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6302." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7302", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6302", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 86, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6302-2Z.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "ZZ shields are non-contact: 6302-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6302-2RS for that.", "Shielded 6302-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6302-2Z (one shield: 6302-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6302-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6302-2Z for high-contamination positions.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-ZZ bearing?", "a": "A 6302-ZZ deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 80 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6302-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6302-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2Z — two non-contact sheet-metal shields, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 19000 r/min, mass 86 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6302-ZZ." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7302", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6302-2Z", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 85, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6302-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "Contact seals add drag and heat: 6302-2RS runs slower and cooler-limited than the open 6302; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6302-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6302-2RS.", "SKF catalogues the contact-sealed version as 6302-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6302-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6302-RSH exists for arrangements that lubricate through the open side; fitting 6302-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-2RS bearing?", "a": "A 6302-2RS deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 80 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6302-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6302-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2RSH — two contact elastomer seals over a lifetime grease fill, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 12000 r/min, mass 85 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6302-2RS." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7302", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6302-2RSH", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "The open 6303 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6303 units.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6303 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6303-2Z (shields) and 6303-2RSH (contact seals), not suffix-free 6303.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303 bearing?", "a": "A 6303 deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 108 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6303 mean?", "a": "A bare 6303 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6303?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303 — the open (unsealed) execution, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 22000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6303." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6303", "material": "GCr15", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6303-2Z.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "ZZ shields are non-contact: 6303-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6303-2RS for that.", "Shielded 6303-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6303-2Z (one shield: 6303-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6303-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6303-2Z for high-contamination positions.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303-ZZ bearing?", "a": "A 6303-ZZ deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 108 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6303-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6303-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303-2Z — two non-contact sheet-metal shields, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 17000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6303-ZZ." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6303-2Z", "material": "GCr15", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "The open 6304 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6304 units.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6304 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6304-2Z (shields) and 6304-2RSH (contact seals), not suffix-free 6304.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304 bearing?", "a": "A 6304 deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 138 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6304 mean?", "a": "A bare 6304 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304 — the open (unsealed) execution, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 19000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6304." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7304", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6304", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6304-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "ZZ shields are non-contact: 6304-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6304-2RS for that.", "Shielded 6304-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6304-ZZ.", "SKF spells the shielded version 6304-2Z (one shield: 6304-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6304-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6304-2Z for high-contamination positions.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-ZZ bearing?", "a": "A 6304-ZZ deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 138 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6304-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2Z — two non-contact sheet-metal shields, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6304-ZZ." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7304", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6304-2Z", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6304-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "Contact seals add drag and heat: 6304-2RS runs slower and cooler-limited than the open 6304; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6304-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6304-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6304-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed. The single-seal catalogue number is 6304-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6304-RSH exists for arrangements that lubricate through the open side; fitting 6304-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-2RS bearing?", "a": "A 6304-2RS deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 138 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6304-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2RSH — two contact elastomer seals over a lifetime grease fill, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 9500 r/min, mass 150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6304-2RS." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7304", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6304-2RSH", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "The open 6305 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6305 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6305 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6305-2Z (shields) and 6305-2RSH (contact seals), not suffix-free 6305.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305 bearing?", "a": "A 6305 deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 219 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6305 mean?", "a": "A bare 6305 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6305?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305 — the open (unsealed) execution, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 16000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6305." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7305", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6305", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6305-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "ZZ shields are non-contact: 6305-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6305-2RS for that.", "Shielded 6305-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6305-2Z (one shield: 6305-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6305-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6305-2Z for high-contamination positions.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-ZZ bearing?", "a": "A 6305-ZZ deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 219 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6305-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6305-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2Z — two non-contact sheet-metal shields, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 13000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6305-ZZ." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7305", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6305-2Z", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6305-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "Contact seals add drag and heat: 6305-2RS runs slower and cooler-limited than the open 6305; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6305-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6305-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6305-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6305-RSH exists for arrangements that lubricate through the open side; fitting 6305-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-2RS bearing?", "a": "A 6305-2RS deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 219 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6305-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6305-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2RSH — two contact elastomer seals over a lifetime grease fill, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 7500 r/min, mass 240 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6305-2RS." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7305", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6305-2RSH", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "The open 6306 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6306 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6306.", "The open 6306 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6306-2Z (shields) and 6306-2RSH (contact seals), not suffix-free 6306.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306 bearing?", "a": "A 6306 deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 326 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6306 mean?", "a": "A bare 6306 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 30 mm bore?", "a": "The '3' is the medium diameter series: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 6206 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6306?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306 — the open (unsealed) execution, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 13000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6306." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7306", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6306", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6306-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "ZZ shields are non-contact: 6306-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6306-2RS for that.", "Shielded 6306-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6306-2Z (one shield: 6306-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6306-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6306-2Z for high-contamination positions.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-ZZ bearing?", "a": "A 6306-ZZ deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 326 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6306-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 30 mm bore?", "a": "The '3' is the medium diameter series: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 6206 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6306-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2Z — two non-contact sheet-metal shields, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 11000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6306-ZZ." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7306", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6306-2Z", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6306-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "Contact seals add drag and heat: 6306-2RS runs slower and cooler-limited than the open 6306; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6306-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6306-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6306-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6306-RSH exists for arrangements that lubricate through the open side; fitting 6306-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-2RS bearing?", "a": "A 6306-2RS deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 326 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6306-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 30 mm bore?", "a": "The '3' is the medium diameter series: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 6206 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6306-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2RSH — two contact elastomer seals over a lifetime grease fill, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 6300 r/min, mass 350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6306-2RS." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7306", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6306-2RSH", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "The open 6307 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×80×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6307 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6307 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6307-2Z (shields) and 6307-2RSH (contact seals), not suffix-free 6307.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307 bearing?", "a": "A 6307 deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 436 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6307 bore code work?", "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6307 mean?", "a": "A bare 6307 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6307?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307 — the open (unsealed) execution, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 12000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6307." } ], "cross_ref": [ { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7307", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6307", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 480, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6307-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "ZZ shields are non-contact: 6307-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6307-2RS for that.", "Shielded 6307-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6307-2Z (one shield: 6307-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6307-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6307-2Z for high-contamination positions.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307-ZZ bearing?", "a": "A 6307-ZZ deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 436 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6307 bore code work?", "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6307-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6307-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307-2Z — two non-contact sheet-metal shields, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 9500 r/min, mass 480 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6307-ZZ." } ], "cross_ref": [ { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7307", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6307-2Z", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6307-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "Contact seals add drag and heat: 6307-2RS runs slower and cooler-limited than the open 6307; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6307-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6307-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed. The single-seal catalogue number is 6307-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6307-RSH exists for arrangements that lubricate through the open side; fitting 6307-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307-2RS bearing?", "a": "A 6307-2RS deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 436 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6307 bore code work?", "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6307-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6307-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307-2RSH — two contact elastomer seals over a lifetime grease fill, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 6000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6307-2RS." } ], "cross_ref": [ { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7307", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6307-2RSH", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 630, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "The open 6308 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6308 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6308-C3. No clearance suffix means normal CN clearance.", "The open 6308 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6308-2Z (shields) and 6308-2RSH (contact seals), not suffix-free 6308.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308 bearing?", "a": "A 6308 deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 599 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6308 mean?", "a": "A bare 6308 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6308?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308 — the open (unsealed) execution, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 11000 r/min, mass 630 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6308." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7308", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6308", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6308-2Z.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "ZZ shields are non-contact: 6308-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6308-2RS for that.", "Shielded 6308-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6308-2Z (one shield: 6308-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6308-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6308-2Z for high-contamination positions.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-ZZ bearing?", "a": "A 6308-ZZ deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 599 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6308-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6308-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2Z — two non-contact sheet-metal shields, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 8500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6308-ZZ." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7308", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6308-2Z", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6308-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "Contact seals add drag and heat: 6308-2RS runs slower and cooler-limited than the open 6308; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6308-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6308-2RS.", "SKF catalogues the contact-sealed version as 6308-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed. The single-seal catalogue number is 6308-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6308-RSH exists for arrangements that lubricate through the open side; fitting 6308-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-2RS bearing?", "a": "A 6308-2RS deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 599 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6308-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6308-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2RSH — two contact elastomer seals over a lifetime grease fill, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 5000 r/min, mass 640 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6308-2RS." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7308", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6308-2RSH", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 840, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "The open 6309 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6309 units.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6309 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6309-2Z (shields) and 6309-2RSH (contact seals), not suffix-free 6309.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309 bearing?", "a": "A 6309 deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 799 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6309 mean?", "a": "A bare 6309 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6309?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309 — the open (unsealed) execution, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 9500 r/min, mass 840 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6309." } ], "cross_ref": [ { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7309", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6309", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 870, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6309-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "ZZ shields are non-contact: 6309-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6309-2RS for that.", "Shielded 6309-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6309-2Z (one shield: 6309-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6309-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6309-2Z for high-contamination positions.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309-ZZ bearing?", "a": "A 6309-ZZ deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 799 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6309-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6309-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309-2Z — two non-contact sheet-metal shields, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 7500 r/min, mass 870 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6309-ZZ." } ], "cross_ref": [ { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7309", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6309-2Z", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6309-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "Contact seals add drag and heat: 6309-2RS runs slower and cooler-limited than the open 6309; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6309-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6309-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6309-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6309-RSH exists for arrangements that lubricate through the open side; fitting 6309-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309-2RS bearing?", "a": "A 6309-2RS deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 799 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6309-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6309-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309-2RSH — two contact elastomer seals over a lifetime grease fill, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 4500 r/min, mass 850 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6309-2RS." } ], "cross_ref": [ { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7309", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6309-2RSH", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "The open 6310 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×110×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6310 units.", "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6310 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6310-2Z (shields) and 6310-2RSH (contact seals), not suffix-free 6310.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310 bearing?", "a": "A 6310 deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1039 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6310 mean?", "a": "A bare 6310 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 50 mm bore?", "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6310?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310 — the open (unsealed) execution, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 8500 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6310." } ], "cross_ref": [ { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6310", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6310-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "ZZ shields are non-contact: 6310-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6310-2RS for that.", "Shielded 6310-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6310-ZZ.", "SKF spells the shielded version 6310-2Z (one shield: 6310-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6310-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6310-2Z for high-contamination positions.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310-ZZ bearing?", "a": "A 6310-ZZ deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1039 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6310-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 50 mm bore?", "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6310-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310-2Z — two non-contact sheet-metal shields, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 6700 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6310-ZZ." } ], "cross_ref": [ { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6310-2Z", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6310-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "Contact seals add drag and heat: 6310-2RS runs slower and cooler-limited than the open 6310; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6310-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6310-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6310-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6310-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6310-RSH exists for arrangements that lubricate through the open side; fitting 6310-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310-2RS bearing?", "a": "A 6310-2RS deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1039 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6310-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 50 mm bore?", "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6310-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310-2RSH — two contact elastomer seals over a lifetime grease fill, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 4300 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6310-2RS." } ], "cross_ref": [ { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6310-2RSH", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "The open 6311 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×120×29 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6311 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6311 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6311-2Z (shields) and 6311-2RSH (contact seals), not suffix-free 6311.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311 bearing?", "a": "A 6311 deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1322 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6311 mean?", "a": "A bare 6311 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6311?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311 — the open (unsealed) execution, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 8000 r/min, mass 1350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6311." } ], "cross_ref": [ { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6311", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6311-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "ZZ shields are non-contact: 6311-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6311-2RS for that.", "Shielded 6311-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6311-2Z (one shield: 6311-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6311-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6311-2Z for high-contamination positions.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311-ZZ bearing?", "a": "A 6311-ZZ deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1322 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6311-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6311-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311-2Z — two non-contact sheet-metal shields, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 6300 r/min, mass 1400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6311-ZZ." } ], "cross_ref": [ { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6311-2Z", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6311-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "Contact seals add drag and heat: 6311-2RS runs slower and cooler-limited than the open 6311; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6311-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6311-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 3800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed. The single-seal catalogue number is 6311-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6311-RSH exists for arrangements that lubricate through the open side; fitting 6311-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311-2RS bearing?", "a": "A 6311-2RS deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1322 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6311-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6311-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311-2RSH — two contact elastomer seals over a lifetime grease fill, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 3800 r/min, mass 1400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6311-2RS." } ], "cross_ref": [ { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6311-2RSH", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "The open 6312 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6312 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6312.", "The open 6312 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6312-2Z (shields) and 6312-2RSH (contact seals), not suffix-free 6312.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312 bearing?", "a": "A 6312 deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1652 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6312 mean?", "a": "A bare 6312 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6312?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312 — the open (unsealed) execution, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 7000 r/min, mass 1700 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6312." } ], "cross_ref": [ { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6312", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6312-2Z.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "ZZ shields are non-contact: 6312-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6312-2RS for that.", "Shielded 6312-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6312-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6312-2Z (one shield: 6312-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6312-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6312-2Z for high-contamination positions.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312-ZZ bearing?", "a": "A 6312-ZZ deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1652 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6312-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6312-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312-2Z — two non-contact sheet-metal shields, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 5600 r/min, mass 1800 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6312-ZZ." } ], "cross_ref": [ { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6312-2Z", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6312-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "Contact seals add drag and heat: 6312-2RS runs slower and cooler-limited than the open 6312; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6312-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6312-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6312-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6312-RSH exists for arrangements that lubricate through the open side; fitting 6312-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312-2RS bearing?", "a": "A 6312-2RS deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1652 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6312-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6312-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312-2RSH — two contact elastomer seals over a lifetime grease fill, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 3400 r/min, mass 1750 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6312-2RS." } ], "cross_ref": [ { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6312-2RSH", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "The open 6313 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6313 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6313 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6313-2Z (shields) and 6313-2RSH (contact seals), not suffix-free 6313.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313 bearing?", "a": "A 6313 deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2033 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6313 mean?", "a": "A bare 6313 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6313?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313 — the open (unsealed) execution, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 6700 r/min, mass 2100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6313." } ], "cross_ref": [ { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6313", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6313-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "ZZ shields are non-contact: 6313-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6313-2RS for that.", "Shielded 6313-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6313-2Z (one shield: 6313-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6313-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6313-2Z for high-contamination positions.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313-ZZ bearing?", "a": "A 6313-ZZ deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2033 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6313-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6313-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313-2Z — two non-contact sheet-metal shields, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 5300 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6313-ZZ." } ], "cross_ref": [ { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6313-2Z", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6313-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "Contact seals add drag and heat: 6313-2RS runs slower and cooler-limited than the open 6313; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6313-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6313-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6313-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6313-RS1 exists for arrangements that lubricate through the open side; fitting 6313-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313-2RS bearing?", "a": "A 6313-2RS deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2033 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6313-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6313-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 3200 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6313-2RS." } ], "cross_ref": [ { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6313-2RS1", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "The open 6314 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6314 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-C3. No clearance suffix means normal CN clearance.", "The open 6314 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6314-2Z (shields) and 6314-2RSH (contact seals), not suffix-free 6314.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314 bearing?", "a": "A 6314 deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2469 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6314 mean?", "a": "A bare 6314 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6314?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314 — the open (unsealed) execution, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 6300 r/min, mass 2550 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6314." } ], "cross_ref": [ { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6314", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6314-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "ZZ shields are non-contact: 6314-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6314-2RS for that.", "Shielded 6314-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6314-2Z (one shield: 6314-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6314-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6314-2Z for high-contamination positions.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314-ZZ bearing?", "a": "A 6314-ZZ deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2469 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6314-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6314-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314-2Z — two non-contact sheet-metal shields, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 5000 r/min, mass 2650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6314-ZZ." } ], "cross_ref": [ { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6314-2Z", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6314-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "Contact seals add drag and heat: 6314-2RS runs slower and cooler-limited than the open 6314; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6314-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6314-2RS.", "SKF catalogues the contact-sealed version as 6314-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6314-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6314-RS1 exists for arrangements that lubricate through the open side; fitting 6314-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314-2RS bearing?", "a": "A 6314-2RS deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2469 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6314-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6314-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 3000 r/min, mass 2600 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6314-2RS." } ], "cross_ref": [ { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6314-2RS1", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "The open 6315 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6315 units.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6315 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6315-2Z (shields) and 6315-2RSH (contact seals), not suffix-free 6315.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315 bearing?", "a": "A 6315 deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2962 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6315 bore code work?", "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6315 mean?", "a": "A bare 6315 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6315?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315 — the open (unsealed) execution, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 5600 r/min, mass 3050 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6315." } ], "cross_ref": [ { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6315", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6315-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "ZZ shields are non-contact: 6315-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6315-2RS for that.", "Shielded 6315-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6315-2Z (one shield: 6315-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6315-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6315-2Z for high-contamination positions.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315-ZZ bearing?", "a": "A 6315-ZZ deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2962 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6315 bore code work?", "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6315-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6315-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315-2Z — two non-contact sheet-metal shields, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 4500 r/min, mass 3150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6315-ZZ." } ], "cross_ref": [ { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6315-2Z", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6315-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "Contact seals add drag and heat: 6315-2RS runs slower and cooler-limited than the open 6315; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6315-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6315-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9000 r/min thermal reference speed. The single-seal catalogue number is 6315-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6315-RS1 exists for arrangements that lubricate through the open side; fitting 6315-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315-2RS bearing?", "a": "A 6315-2RS deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2962 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6315 bore code work?", "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6315-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6315-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 2800 r/min, mass 3150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6315-2RS." } ], "cross_ref": [ { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6315-2RS1", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "The open 6316 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×170×39 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6316 units.", "Shaft and housing fillets must clear the bearing chamfer so the 39 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6316 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6316-2Z (shields) and 6316-2RSH (contact seals), not suffix-free 6316.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316 bearing?", "a": "A 6316 deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 3517 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6316 mean?", "a": "A bare 6316 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6316?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316 — the open (unsealed) execution, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 5300 r/min, mass 3650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6316." } ], "cross_ref": [ { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6316", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6316-2Z.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "ZZ shields are non-contact: 6316-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6316-2RS for that.", "Shielded 6316-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6316-ZZ.", "SKF spells the shielded version 6316-2Z (one shield: 6316-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6316-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6316-2Z for high-contamination positions.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316-ZZ bearing?", "a": "A 6316-ZZ deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 3517 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6316-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6316-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316-2Z — two non-contact sheet-metal shields, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 4300 r/min, mass 3750 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6316-ZZ." } ], "cross_ref": [ { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6316-2Z", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6316-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "Contact seals add drag and heat: 6316-2RS runs slower and cooler-limited than the open 6316; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6316-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6316-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6316-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6316-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6316-RS1 exists for arrangements that lubricate through the open side; fitting 6316-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316-2RS bearing?", "a": "A 6316-2RS deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 3517 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6316-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6316-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 2600 r/min, mass 3700 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6316-2RS." } ], "cross_ref": [ { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6316-2RS1", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "The open 6317 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×41 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6317 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6317 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6317-2Z (shields) and 6317-2RSH (contact seals), not suffix-free 6317.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317 bearing?", "a": "A 6317 deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 4136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6317 mean?", "a": "A bare 6317 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6317?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317 — the open (unsealed) execution, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 5000 r/min, mass 4250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6317." } ], "cross_ref": [ { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6317", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6317-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "ZZ shields are non-contact: 6317-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6317-2RS for that.", "Shielded 6317-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6317-2Z (one shield: 6317-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6317-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6317-2Z for high-contamination positions.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317-ZZ bearing?", "a": "A 6317-ZZ deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 4136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6317-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6317-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317-2Z — two non-contact sheet-metal shields, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 4000 r/min, mass 4400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6317-ZZ." } ], "cross_ref": [ { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6317-2Z", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6317-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "Contact seals add drag and heat: 6317-2RS runs slower and cooler-limited than the open 6317; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6317-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6317-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6317-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6317-RS1 exists for arrangements that lubricate through the open side; fitting 6317-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317-2RS bearing?", "a": "A 6317-2RS deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 4136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6317-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6317-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 2400 r/min, mass 4350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6317-2RS." } ], "cross_ref": [ { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6317-2RS1", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "The open 6318 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×190×43 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6318 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6318.", "The open 6318 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6318-2Z (shields) and 6318-2RSH (contact seals), not suffix-free 6318.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318 bearing?", "a": "A 6318 deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 4825 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6318 mean?", "a": "A bare 6318 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6318?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318 — the open (unsealed) execution, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 4800 r/min, mass 4950 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6318." } ], "cross_ref": [ { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6318", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6318-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "ZZ shields are non-contact: 6318-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6318-2RS for that.", "Shielded 6318-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6318-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6318-2Z (one shield: 6318-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6318-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6318-2Z for high-contamination positions.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318-ZZ bearing?", "a": "A 6318-ZZ deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 4825 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6318-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6318-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318-2Z — two non-contact sheet-metal shields, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 3800 r/min, mass 5150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6318-ZZ." } ], "cross_ref": [ { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6318-2Z", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6318-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "Contact seals add drag and heat: 6318-2RS runs slower and cooler-limited than the open 6318; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6318-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 43 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6318-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6318-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6318-RS1 exists for arrangements that lubricate through the open side; fitting 6318-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318-2RS bearing?", "a": "A 6318-2RS deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 4825 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6318-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6318-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 2400 r/min, mass 5100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6318-2RS." } ], "cross_ref": [ { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6318-2RS1", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "The open 6319 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×200×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6319 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6319 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6319-2Z (shields) and 6319-2RSH (contact seals), not suffix-free 6319.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319 bearing?", "a": "A 6319 deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 5586 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6319 mean?", "a": "A bare 6319 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6319?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319 — the open (unsealed) execution, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 4500 r/min, mass 5750 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6319." } ], "cross_ref": [ { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6319", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6319-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "ZZ shields are non-contact: 6319-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6319-2RS for that.", "Shielded 6319-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6319-2Z (one shield: 6319-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6319-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6319-2Z for high-contamination positions.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319-ZZ bearing?", "a": "A 6319-ZZ deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 5586 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6319-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6319-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319-2Z — two non-contact sheet-metal shields, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 3600 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6319-ZZ." } ], "cross_ref": [ { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6319-2Z", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6319-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "Contact seals add drag and heat: 6319-2RS runs slower and cooler-limited than the open 6319; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6319-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6319-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7000 r/min thermal reference speed. The single-seal catalogue number is 6319-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6319-RS1 exists for arrangements that lubricate through the open side; fitting 6319-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319-2RS bearing?", "a": "A 6319-2RS deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 5586 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6319-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6319-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 2200 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6319-2RS." } ], "cross_ref": [ { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6319-2RS1", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 2200, "max_rpm": 2200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6320-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6320-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "ZZ shields are non-contact: 6320-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6320-2RS for that.", "Shielded 6320-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 47 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6320-2Z (one shield: 6320-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6320-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6320-2Z for high-contamination positions.", "The 174/140 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6320-ZZ bearing?", "a": "A 6320-ZZ deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 6823 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6320-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6320-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6320-2Z — two non-contact sheet-metal shields, 100×215×47 mm per ISO 15. Quoted values: C 174 kN, C0 140 kN, Pu 4.75 kN, limiting speed 3400 r/min, mass 7300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6320-ZZ." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6320-2Z", "material": "GCr15", "dynamic_load_kN": 174, "static_load_kN": 140, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6320-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6320-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "Contact seals add drag and heat: 6320-2RS runs slower and cooler-limited than the open 6320; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6320-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6320-2RS.", "SKF catalogues the contact-sealed version as 6320-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life. The single-seal catalogue number is 6320-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6320-RS1 exists for arrangements that lubricate through the open side; fitting 6320-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 174/140 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6320-2RS bearing?", "a": "A 6320-2RS deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 6823 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6320-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6320-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6320-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×215×47 mm per ISO 15. Quoted values: C 174 kN, C0 140 kN, Pu 4.75 kN, limiting speed 2000 r/min, mass 7200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6320-2RS." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6320-2RS1", "material": "GCr15", "dynamic_load_kN": 174, "static_load_kN": 140, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 2000, "max_rpm": 2000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6321", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "The open 6321 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×225×49 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6321 units.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6321 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6321-2Z (shields) and 6321-2RSH (contact seals), not suffix-free 6321.", "The 182/153 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6321 bearing?", "a": "A 6321 deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 7776 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6321 mean?", "a": "A bare 6321 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6321?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6321 — the open (unsealed) execution, 105×225×49 mm per ISO 15. Quoted values: C 182 kN, C0 153 kN, Pu 5.1 kN, limiting speed 4000 r/min, mass 8200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6321." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7321", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6321", "material": "GCr15", "dynamic_load_kN": 182, "static_load_kN": 153, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6321-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6321-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "ZZ shields are non-contact: 6321-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6321-2RS for that.", "Shielded 6321-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6321-2Z (one shield: 6321-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6321-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6321-2Z for high-contamination positions.", "The 182/153 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6321-ZZ bearing?", "a": "A 6321-ZZ deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 7776 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6321-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6321-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6321-2Z — two non-contact sheet-metal shields, 105×225×49 mm per ISO 15. Quoted values: C 182 kN, C0 153 kN, Pu 5.1 kN, limiting speed 3200 r/min, mass 8250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6321-ZZ." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7321", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6321-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6321-2Z", "material": "GCr15", "dynamic_load_kN": 182, "static_load_kN": 153, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6322", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 9650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "The open 6322 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×240×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6322 units.", "Shaft and housing fillets must clear the bearing chamfer so the 50 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6322 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6322-2Z (shields) and 6322-2RSH (contact seals), not suffix-free 6322.", "The 203/180 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6322 bearing?", "a": "A 6322 deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 9117 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6322 mean?", "a": "A bare 6322 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 110 mm bore?", "a": "The '3' is the medium diameter series: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 6222 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6322?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6322 — the open (unsealed) execution, 110×240×50 mm per ISO 15. Quoted values: C 203 kN, C0 180 kN, Pu 5.7 kN, limiting speed 3800 r/min, mass 9650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6322." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6322-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7322", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21322", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6322", "material": "GCr15", "dynamic_load_kN": 203, "static_load_kN": 180, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6004; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6004 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6004 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6004-C3. No clearance suffix means normal CN clearance.", "The open 6004 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6004-2Z (shields) and 6004-2RSH (contact seals), not suffix-free 6004.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004 bearing?", "a": "A 6004 deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 66 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6004 mean?", "a": "A bare 6004 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004 — the open (unsealed) execution, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 24000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6004." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7004", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6004", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 71, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6004-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6004-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6004-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6004-2RS for that.", "Shielded 6004-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6004-2Z (one shield: 6004-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6004-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6004-2Z for high-contamination positions.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-ZZ bearing?", "a": "A 6004-ZZ deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 66 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6004-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2Z — two non-contact sheet-metal shields, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 71 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6004-ZZ." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7004", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6004-2Z", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6004-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6004-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6004-2RS runs slower and cooler-limited than the open 6004; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6004-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6004-2RS.", "SKF catalogues the contact-sealed version as 6004-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 11000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6004-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6004-RSH exists for arrangements that lubricate through the open side; fitting 6004-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-2RS bearing?", "a": "A 6004-2RS deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 66 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6004-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2RSH — two contact elastomer seals over a lifetime grease fill, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 11000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6004-2RS." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7004", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6004-2RSH", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 78, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6005 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×47×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6005 units.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6005 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6005-2Z (shields) and 6005-2RSH (contact seals), not suffix-free 6005.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005 bearing?", "a": "A 6005 deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 76 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6005 mean?", "a": "A bare 6005 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6005?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005 — the open (unsealed) execution, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 20000 r/min, mass 78 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6005." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7005", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6005", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6005-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6005-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6005-2RS for that.", "Shielded 6005-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6005-2Z (one shield: 6005-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6005-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6005-2Z for high-contamination positions.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-ZZ bearing?", "a": "A 6005-ZZ deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 76 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6005-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6005-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2Z — two non-contact sheet-metal shields, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 16000 r/min, mass 83 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6005-ZZ." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7005", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6005-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6005-2Z", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 81, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6005-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6005-2RS runs slower and cooler-limited than the open 6005; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6005-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6005-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed. The single-seal catalogue number is 6005-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6005-RSH exists for arrangements that lubricate through the open side; fitting 6005-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-2RS bearing?", "a": "A 6005-2RS deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 76 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6005-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6005-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2RSH — two contact elastomer seals over a lifetime grease fill, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 9500 r/min, mass 81 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6005-2RS." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7005", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6005-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6005-2RSH", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6006-2Z.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6006-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6006-2RS for that.", "Shielded 6006-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 55 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6006-ZZ.", "SKF spells the shielded version 6006-2Z (one shield: 6006-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6006-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6006-2Z for high-contamination positions.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-ZZ bearing?", "a": "A 6006-ZZ deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 111 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6006-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6006-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2Z — two non-contact sheet-metal shields, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6006-ZZ." } ], "cross_ref": [ { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7006", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6006-2Z", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6006-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6006-2RS runs slower and cooler-limited than the open 6006; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6006-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6006-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6006-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8000 r/min limiting speed is set by seal-lip drag and grease life. The single-seal catalogue number is 6006-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6006-RS1 exists for arrangements that lubricate through the open side; fitting 6006-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-2RS bearing?", "a": "A 6006-2RS deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 111 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6006-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6006-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 8000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6006-2RS." } ], "cross_ref": [ { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7006", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6006-2RS1", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6007 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×62×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6007 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6007 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6007-2Z (shields) and 6007-2RSH (contact seals), not suffix-free 6007.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007 bearing?", "a": "A 6007 deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 147 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6007 mean?", "a": "A bare 6007 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007 — the open (unsealed) execution, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6007." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7007", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6007", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6007-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6007-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6007-2RS for that.", "Shielded 6007-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6007-2Z (one shield: 6007-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6007-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6007-2Z for high-contamination positions.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-ZZ bearing?", "a": "A 6007-ZZ deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 147 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6007-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2Z — two non-contact sheet-metal shields, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 12000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6007-ZZ." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7007", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6007-2Z", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6007-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6007-2RS runs slower and cooler-limited than the open 6007; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6007-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6007-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6007-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6007-RS1 exists for arrangements that lubricate through the open side; fitting 6007-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-2RS bearing?", "a": "A 6007-2RS deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 147 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6007-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 7000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6007-2RS." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7007", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6007-2RS1", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6008 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×68×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6008 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6008.", "The open 6008 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6008-2Z (shields) and 6008-2RSH (contact seals), not suffix-free 6008.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008 bearing?", "a": "A 6008 deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 182 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6008 mean?", "a": "A bare 6008 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008 — the open (unsealed) execution, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 14000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6008." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7008", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6008", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6008-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6008-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6008-2RS for that.", "Shielded 6008-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6008-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6008-2Z (one shield: 6008-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6008-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6008-2Z for high-contamination positions.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-ZZ bearing?", "a": "A 6008-ZZ deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 182 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6008-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2Z — two non-contact sheet-metal shields, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6008-ZZ." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7008", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6008-2Z", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6008-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6008-2RS runs slower and cooler-limited than the open 6008; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6008-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6008-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 22000 r/min thermal reference speed. The single-seal catalogue number is 6008-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6008-RS1 exists for arrangements that lubricate through the open side; fitting 6008-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-2RS bearing?", "a": "A 6008-2RS deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 182 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6008-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 6300 r/min, mass 200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6008-2RS." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7008", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6008-2RS1", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6009 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×75×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6009 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6009 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6009-2Z (shields) and 6009-2RSH (contact seals), not suffix-free 6009.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009 bearing?", "a": "A 6009 deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 231 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6009 mean?", "a": "A bare 6009 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6009?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009 — the open (unsealed) execution, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 12000 r/min, mass 240 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6009." } ], "cross_ref": [ { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7009", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6009", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 20000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6009-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6009-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6009-2RS for that.", "Shielded 6009-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6009-2Z (one shield: 6009-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6009-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6009-2Z for high-contamination positions.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009-ZZ bearing?", "a": "A 6009-ZZ deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 231 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6009-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6009-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009-2Z — two non-contact sheet-metal shields, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 10000 r/min, mass 250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6009-ZZ." } ], "cross_ref": [ { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7009", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6009-2Z", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6009-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6009-2RS runs slower and cooler-limited than the open 6009; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6009-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6009-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6009-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6009-RS1 exists for arrangements that lubricate through the open side; fitting 6009-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009-2RS bearing?", "a": "A 6009-2RS deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 231 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6009-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6009-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 5600 r/min, mass 250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6009-2RS." } ], "cross_ref": [ { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7009", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6009-2RS1", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6010 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×80×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6010 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6010-C3. No clearance suffix means normal CN clearance.", "The open 6010 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6010-2Z (shields) and 6010-2RSH (contact seals), not suffix-free 6010.", "The 22.9/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010 bearing?", "a": "A 6010 deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 250 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6010 mean?", "a": "A bare 6010 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010 — the open (unsealed) execution, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 16 kN, Pu 0.71 kN, limiting speed 11000 r/min, mass 260 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6010." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7010", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6010", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 16, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6010-2Z.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6010-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6010-2RS for that.", "Shielded 6010-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6010-2Z (one shield: 6010-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6010-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6010-2Z for high-contamination positions.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-ZZ bearing?", "a": "A 6010-ZZ deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 250 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6010-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2Z — two non-contact sheet-metal shields, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 9000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6010-ZZ." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7010", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6010-2Z", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6010-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6010-2RS runs slower and cooler-limited than the open 6010; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6010-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6010-2RS.", "SKF catalogues the contact-sealed version as 6010-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 18000 r/min thermal reference speed. The single-seal catalogue number is 6010-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6010-RS1 exists for arrangements that lubricate through the open side; fitting 6010-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-2RS bearing?", "a": "A 6010-2RS deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 250 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6010-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 5000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6010-2RS." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7010", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6010-2RS1", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6011 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6011 units.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6011 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6011-2Z (shields) and 6011-2RSH (contact seals), not suffix-free 6011.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011 bearing?", "a": "A 6011 deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 366 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6011 mean?", "a": "A bare 6011 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6011?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011 — the open (unsealed) execution, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 10000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6011." } ], "cross_ref": [ { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7011", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6011", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6011-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6011-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6011-2RS for that.", "Shielded 6011-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6011-2Z (one shield: 6011-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6011-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6011-2Z for high-contamination positions.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011-ZZ bearing?", "a": "A 6011-ZZ deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 366 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6011-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6011-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011-2Z — two non-contact sheet-metal shields, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 8000 r/min, mass 400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6011-ZZ." } ], "cross_ref": [ { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7011", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6011-2Z", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6011-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6011-2RS runs slower and cooler-limited than the open 6011; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6011-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6011-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed. The single-seal catalogue number is 6011-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6011-RS1 exists for arrangements that lubricate through the open side; fitting 6011-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011-2RS bearing?", "a": "A 6011-2RS deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 366 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6011-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6011-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 4500 r/min, mass 400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6011-2RS." } ], "cross_ref": [ { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7011", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6011-2RS1", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6012 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×95×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6012 units.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6012 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6012-2Z (shields) and 6012-2RSH (contact seals), not suffix-free 6012.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012 bearing?", "a": "A 6012 deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 391 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6012 mean?", "a": "A bare 6012 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6012?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012 — the open (unsealed) execution, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 9500 r/min, mass 410 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6012." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7012", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6012", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6012-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6012-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6012-2RS for that.", "Shielded 6012-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 95 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6012-ZZ.", "SKF spells the shielded version 6012-2Z (one shield: 6012-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6012-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6012-2Z for high-contamination positions.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-ZZ bearing?", "a": "A 6012-ZZ deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 391 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6012-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6012-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2Z — two non-contact sheet-metal shields, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 7500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6012-ZZ." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7012", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6012-2Z", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6012-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6012-2RS runs slower and cooler-limited than the open 6012; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6012-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6012-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6012-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6012-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6012-RS1 exists for arrangements that lubricate through the open side; fitting 6012-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-2RS bearing?", "a": "A 6012-2RS deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 391 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6012-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6012-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 4300 r/min, mass 430 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6012-2RS." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7012", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6012-2RS1", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 440, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6013 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×100×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6013 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6013 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6013-2Z (shields) and 6013-2RSH (contact seals), not suffix-free 6013.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013 bearing?", "a": "A 6013 deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 417 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6013 mean?", "a": "A bare 6013 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6013?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013 — the open (unsealed) execution, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 9000 r/min, mass 440 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6013." } ], "cross_ref": [ { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7013", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6013", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6013-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6013-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6013-2RS for that.", "Shielded 6013-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6013-2Z (one shield: 6013-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6013-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6013-2Z for high-contamination positions.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013-ZZ bearing?", "a": "A 6013-ZZ deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 417 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6013-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6013-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013-2Z — two non-contact sheet-metal shields, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 7000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6013-ZZ." } ], "cross_ref": [ { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7013", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6013-2Z", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6013-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6013-2RS runs slower and cooler-limited than the open 6013; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6013-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6013-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed. The single-seal catalogue number is 6013-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6013-RS1 exists for arrangements that lubricate through the open side; fitting 6013-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013-2RS bearing?", "a": "A 6013-2RS deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 417 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6013-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6013-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 4000 r/min, mass 450 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6013-2RS." } ], "cross_ref": [ { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7013", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6013-2RS1", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6014 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×110×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6014 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6014.", "The open 6014 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6014-2Z (shields) and 6014-2RSH (contact seals), not suffix-free 6014.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014 bearing?", "a": "A 6014 deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 577 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6014 mean?", "a": "A bare 6014 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6014?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014 — the open (unsealed) execution, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 8000 r/min, mass 610 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6014." } ], "cross_ref": [ { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7014", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6014", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6014-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6014-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6014-2RS for that.", "Shielded 6014-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6014-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6014-2Z (one shield: 6014-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6014-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6014-2Z for high-contamination positions.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014-ZZ bearing?", "a": "A 6014-ZZ deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 577 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6014-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6014-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014-2Z — two non-contact sheet-metal shields, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 6300 r/min, mass 640 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6014-ZZ." } ], "cross_ref": [ { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7014", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6014-2Z", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 630, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6014-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6014-2RS runs slower and cooler-limited than the open 6014; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6014-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6014-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6014-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6014-RS1 exists for arrangements that lubricate through the open side; fitting 6014-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014-2RS bearing?", "a": "A 6014-2RS deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 577 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6014-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6014-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 3600 r/min, mass 630 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6014-2RS." } ], "cross_ref": [ { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7014", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6014-2RS1", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6015 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6015 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6015 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6015-2Z (shields) and 6015-2RSH (contact seals), not suffix-free 6015.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015 bearing?", "a": "A 6015 deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 609 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6015 mean?", "a": "A bare 6015 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6015?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015 — the open (unsealed) execution, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 7500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6015." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7015", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6015", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 680, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6015-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6015-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6015-2RS for that.", "Shielded 6015-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6015-2Z (one shield: 6015-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6015-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6015-2Z for high-contamination positions.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-ZZ bearing?", "a": "A 6015-ZZ deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 609 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6015-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6015-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2Z — two non-contact sheet-metal shields, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 6000 r/min, mass 680 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6015-ZZ." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7015", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6015-2Z", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6015-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6015-2RS runs slower and cooler-limited than the open 6015; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6015-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6015-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed. The single-seal catalogue number is 6015-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6015-RS1 exists for arrangements that lubricate through the open side; fitting 6015-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-2RS bearing?", "a": "A 6015-2RS deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 609 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6015-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6015-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 3400 r/min, mass 670 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6015-2RS." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7015", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6015-2RS1", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6016 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×125×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6016 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6016-C3. No clearance suffix means normal CN clearance.", "The open 6016 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6016-2Z (shields) and 6016-2RSH (contact seals), not suffix-free 6016.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016 bearing?", "a": "A 6016 deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 813 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6016 mean?", "a": "A bare 6016 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6016?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016 — the open (unsealed) execution, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 7000 r/min, mass 860 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6016." } ], "cross_ref": [ { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7016", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6016", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 890, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6016-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6016-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6016-2RS for that.", "Shielded 6016-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6016-2Z (one shield: 6016-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6016-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6016-2Z for high-contamination positions.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016-ZZ bearing?", "a": "A 6016-ZZ deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 813 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6016-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6016-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016-2Z — two non-contact sheet-metal shields, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 5600 r/min, mass 890 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6016-ZZ." } ], "cross_ref": [ { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7016", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6016-2Z", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6016-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6016-2RS runs slower and cooler-limited than the open 6016; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6016-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6016-2RS.", "SKF catalogues the contact-sealed version as 6016-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6016-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6016-RS1 exists for arrangements that lubricate through the open side; fitting 6016-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016-2RS bearing?", "a": "A 6016-2RS deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 813 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6016-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6016-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 3200 r/min, mass 880 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6016-2RS." } ], "cross_ref": [ { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7016", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6016-2RS1", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6017 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×130×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6017 units.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6017 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6017-2Z (shields) and 6017-2RSH (contact seals), not suffix-free 6017.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017 bearing?", "a": "A 6017 deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 853 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6017 mean?", "a": "A bare 6017 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 85 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (130×22 mm, 22.5 mm radial section) at 85 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6017?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017 — the open (unsealed) execution, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 6700 r/min, mass 900 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6017." } ], "cross_ref": [ { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7017", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6017", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 940, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6017-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6017-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6017-2RS for that.", "Shielded 6017-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6017-2Z (one shield: 6017-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6017-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6017-2Z for high-contamination positions.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017-ZZ bearing?", "a": "A 6017-ZZ deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 853 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6017-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 85 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (130×22 mm, 22.5 mm radial section) at 85 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6017-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017-2Z — two non-contact sheet-metal shields, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 5300 r/min, mass 940 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6017-ZZ." } ], "cross_ref": [ { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7017", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6017-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6017-2Z", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6017-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6017-2RS runs slower and cooler-limited than the open 6017; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6017-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6017-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6017-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6017-RS1 exists for arrangements that lubricate through the open side; fitting 6017-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017-2RS bearing?", "a": "A 6017-2RS deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 853 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6017-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 85 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (130×22 mm, 22.5 mm radial section) at 85 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6017-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 3000 r/min, mass 930 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6017-2RS." } ], "cross_ref": [ { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7017", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6017-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6017-2RS1", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6018 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×140×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6018 units.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6018 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6018-2Z (shields) and 6018-2RSH (contact seals), not suffix-free 6018.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018 bearing?", "a": "A 6018 deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1106 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6018 mean?", "a": "A bare 6018 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 90 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (140×24 mm, 25.0 mm radial section) at 90 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6018?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018 — the open (unsealed) execution, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 6300 r/min, mass 1150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6018." } ], "cross_ref": [ { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7018", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6018", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6018-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6018-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6018-2RS for that.", "Shielded 6018-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6018-ZZ.", "SKF spells the shielded version 6018-2Z (one shield: 6018-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6018-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6018-2Z for high-contamination positions.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018-ZZ bearing?", "a": "A 6018-ZZ deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1106 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6018-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 90 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (140×24 mm, 25.0 mm radial section) at 90 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6018-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018-2Z — two non-contact sheet-metal shields, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 5000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6018-ZZ." } ], "cross_ref": [ { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7018", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6018-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6018-2Z", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6018-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6018-2RS runs slower and cooler-limited than the open 6018; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6018-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6018-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6018-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6018-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6018-RS1 exists for arrangements that lubricate through the open side; fitting 6018-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018-2RS bearing?", "a": "A 6018-2RS deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1106 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6018-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 90 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (140×24 mm, 25.0 mm radial section) at 90 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6018-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 2800 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6018-2RS." } ], "cross_ref": [ { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7018", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6018-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6018-2RS1", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6019 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×145×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6019 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6019 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6019-2Z (shields) and 6019-2RSH (contact seals), not suffix-free 6019.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019 bearing?", "a": "A 6019 deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1154 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6019 bore code work?", "a": "The last two digits of 6019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6019 mean?", "a": "A bare 6019 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6019?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019 — the open (unsealed) execution, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 6000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6019." } ], "cross_ref": [ { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7019", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6019", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6019-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6019-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6019-2RS for that.", "Shielded 6019-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6019-2Z (one shield: 6019-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6019-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6019-2Z for high-contamination positions.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019-ZZ bearing?", "a": "A 6019-ZZ deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1154 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6019 bore code work?", "a": "The last two digits of 6019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6019-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6019-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019-2Z — two non-contact sheet-metal shields, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 4800 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6019-ZZ." } ], "cross_ref": [ { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7019", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6019-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6019-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6019-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6019-2RS runs slower and cooler-limited than the open 6019; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6019-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6019-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019-2RS bearing?", "a": "A 6019-2RS deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1154 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6019 bore code work?", "a": "The last two digits of 6019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6019-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6019-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 2800 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6019-2RS." } ], "cross_ref": [ { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7019", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6019-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6019-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6020 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×150×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6020 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6020.", "The open 6020 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6020-2Z (shields) and 6020-2RSH (contact seals), not suffix-free 6020.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020 bearing?", "a": "A 6020 deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1202 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6020 bore code work?", "a": "The last two digits of 6020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6020 mean?", "a": "A bare 6020 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6020?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020 — the open (unsealed) execution, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 5600 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6020." } ], "cross_ref": [ { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7020", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6020", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6020-2Z.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6020-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6020-2RS for that.", "Shielded 6020-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6020-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6020-2Z (one shield: 6020-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6020-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6020-2Z for high-contamination positions.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020-ZZ bearing?", "a": "A 6020-ZZ deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1202 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6020 bore code work?", "a": "The last two digits of 6020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6020-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6020-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020-2Z — two non-contact sheet-metal shields, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 4500 r/min, mass 1300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6020-ZZ." } ], "cross_ref": [ { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7020", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6020-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6020-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6020-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6020-2RS runs slower and cooler-limited than the open 6020; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6020-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6020-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6020-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6020-RS1 exists for arrangements that lubricate through the open side; fitting 6020-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020-2RS bearing?", "a": "A 6020-2RS deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1202 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6020 bore code work?", "a": "The last two digits of 6020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6020-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6020-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 2600 r/min, mass 1300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6020-2RS." } ], "cross_ref": [ { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7020", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6020-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6020-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6404", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6404 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6404 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6404 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6404-2Z (shields) and 6404-2RSH (contact seals), not suffix-free 6404.", "The 30.7/15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6404 bearing?", "a": "A 6404 deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 364 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6404 bore code work?", "a": "The last two digits of 6404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6404 mean?", "a": "A bare 6404 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 20 mm bore?", "a": "The '4' is the heavy diameter series: 72×19 mm, 26.0 mm radial section at 20 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6404?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6404 — the open (unsealed) execution, 20×72×19 mm per ISO 15. Quoted values: C 30.7 kN, C0 15 kN, Pu 0.64 kN, limiting speed 15000 r/min, mass 410 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6404." } ], "cross_ref": [ { "equiv_sku": "6404-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6404-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7404", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6404", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 15, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6405", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6405; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 25 mm bore (80 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6405 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×80×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6405 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6405.", "The open 6405 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6405-2Z (shields) and 6405-2RSH (contact seals), not suffix-free 6405.", "The 35.8/19.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6405 bearing?", "a": "A 6405 deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 486 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6405 bore code work?", "a": "The last two digits of 6405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6405 mean?", "a": "A bare 6405 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 25 mm bore?", "a": "The '4' is the heavy diameter series: 80×21 mm, 27.5 mm radial section at 25 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6405?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6405 — the open (unsealed) execution, 25×80×21 mm per ISO 15. Quoted values: C 35.8 kN, C0 19.3 kN, Pu 0.815 kN, limiting speed 13000 r/min, mass 540 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6405." } ], "cross_ref": [ { "equiv_sku": "6405-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6405-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7405", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6405", "material": "GCr15", "dynamic_load_kN": 35.8, "static_load_kN": 19.3, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6406", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6406; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 30 mm bore (90 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6406 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6406 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6406 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6406-2Z (shields) and 6406-2RSH (contact seals), not suffix-free 6406.", "The 43.6/23.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6406 bearing?", "a": "A 6406 deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 664 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6406 bore code work?", "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6406 mean?", "a": "A bare 6406 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 30 mm bore?", "a": "The '4' is the heavy diameter series: 90×23 mm, 30.0 mm radial section at 30 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6406?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6406 — the open (unsealed) execution, 30×90×23 mm per ISO 15. Quoted values: C 43.6 kN, C0 23.6 kN, Pu 1 kN, limiting speed 11000 r/min, mass 750 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6406." } ], "cross_ref": [ { "equiv_sku": "6406-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6406-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7406", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6406", "material": "GCr15", "dynamic_load_kN": 43.6, "static_load_kN": 23.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6407", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 970, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6407; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6407 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6407 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6407-C3. No clearance suffix means normal CN clearance.", "The open 6407 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6407-2Z (shields) and 6407-2RSH (contact seals), not suffix-free 6407.", "The 55.3/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6407 bearing?", "a": "A 6407 deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 879 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6407 bore code work?", "a": "The last two digits of 6407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6407 mean?", "a": "A bare 6407 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 35 mm bore?", "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6407?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6407 — the open (unsealed) execution, 35×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31 kN, Pu 1.29 kN, limiting speed 10000 r/min, mass 970 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6407." } ], "cross_ref": [ { "equiv_sku": "6407-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6407-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7407", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6407", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6408", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6408; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 40 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6408 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×110×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6408 units.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6408 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6408-2Z (shields) and 6408-2RSH (contact seals), not suffix-free 6408.", "The 63.7/36.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6408 bearing?", "a": "A 6408 deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6408 bore code work?", "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6408 mean?", "a": "A bare 6408 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 40 mm bore?", "a": "The '4' is the heavy diameter series: 110×27 mm, 35.0 mm radial section at 40 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6408?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6408 — the open (unsealed) execution, 40×110×27 mm per ISO 15. Quoted values: C 63.7 kN, C0 36.5 kN, Pu 1.53 kN, limiting speed 9000 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6408." } ], "cross_ref": [ { "equiv_sku": "6408-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6408-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7408", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6408", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 36.5, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6409", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6409; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 45 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6409 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×120×29 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6409 units.", "Shaft and housing fillets must clear the bearing chamfer so the 29 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6409 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6409-2Z (shields) and 6409-2RSH (contact seals), not suffix-free 6409.", "The 76.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6409 bearing?", "a": "A 6409 deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1438 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6409 bore code work?", "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6409 mean?", "a": "A bare 6409 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 45 mm bore?", "a": "The '4' is the heavy diameter series: 120×29 mm, 37.5 mm radial section at 45 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6409?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6409 — the open (unsealed) execution, 45×120×29 mm per ISO 15. Quoted values: C 76.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 8500 r/min, mass 1550 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6409." } ], "cross_ref": [ { "equiv_sku": "6409-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6409-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7409", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6409", "material": "GCr15", "dynamic_load_kN": 76.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6410", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6410 with C3 for those conditions.", "The 64xx heavy section at 50 mm bore (130 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6410 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6410 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6410 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6410-2Z (shields) and 6410-2RSH (contact seals), not suffix-free 6410.", "The 87.1/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6410 bearing?", "a": "A 6410 deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1789 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6410 bore code work?", "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6410 mean?", "a": "A bare 6410 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 50 mm bore?", "a": "The '4' is the heavy diameter series: 130×31 mm, 40.0 mm radial section at 50 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6410?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6410 — the open (unsealed) execution, 50×130×31 mm per ISO 15. Quoted values: C 87.1 kN, C0 52 kN, Pu 2.2 kN, limiting speed 7500 r/min, mass 1950 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6410." } ], "cross_ref": [ { "equiv_sku": "6410-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6410-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7410", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6410", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6411", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.", "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6411 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6411 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6411.", "The open 6411 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6411-2Z (shields) and 6411-2RSH (contact seals), not suffix-free 6411.", "The 99.5/62 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6411 bearing?", "a": "A 6411 deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2192 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6411 bore code work?", "a": "The last two digits of 6411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6411 mean?", "a": "A bare 6411 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 55 mm bore?", "a": "The '4' is the heavy diameter series: 140×33 mm, 42.5 mm radial section at 55 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6411?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6411 — the open (unsealed) execution, 55×140×33 mm per ISO 15. Quoted values: C 99.5 kN, C0 62 kN, Pu 2.6 kN, limiting speed 7000 r/min, mass 2350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6411." } ], "cross_ref": [ { "equiv_sku": "6411-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6411-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7411", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6411", "material": "GCr15", "dynamic_load_kN": 99.5, "static_load_kN": 62, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6412", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.", "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6412 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6412 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6412 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6412-2Z (shields) and 6412-2RSH (contact seals), not suffix-free 6412.", "The 108/69.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6412 bearing?", "a": "A 6412 deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2651 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6412 bore code work?", "a": "The last two digits of 6412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6412 mean?", "a": "A bare 6412 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 60 mm bore?", "a": "The '4' is the heavy diameter series: 150×35 mm, 45.0 mm radial section at 60 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6412?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6412 — the open (unsealed) execution, 60×150×35 mm per ISO 15. Quoted values: C 108 kN, C0 69.5 kN, Pu 2.9 kN, limiting speed 6300 r/min, mass 2850 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6412." } ], "cross_ref": [ { "equiv_sku": "6412-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6412-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7412", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6412", "material": "GCr15", "dynamic_load_kN": 108, "static_load_kN": 69.5, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6413", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6413 with C3 for those conditions.", "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6413 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6413 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6413-C3. No clearance suffix means normal CN clearance.", "The open 6413 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6413-2Z (shields) and 6413-2RSH (contact seals), not suffix-free 6413.", "The 119/78 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6413 bearing?", "a": "A 6413 deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 3169 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6413 bore code work?", "a": "The last two digits of 6413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6413 mean?", "a": "A bare 6413 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 65 mm bore?", "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6413?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6413 — the open (unsealed) execution, 65×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 78 kN, Pu 3.15 kN, limiting speed 6000 r/min, mass 3350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6413." } ], "cross_ref": [ { "equiv_sku": "6413-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6413-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7413", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6413", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 78, "fatigue_load_limit_kN": 3.15, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6414", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6414 with C3 for those conditions.", "The 64xx heavy section at 70 mm bore (180 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6414 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×180×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6414 units.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6414 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6414-2Z (shields) and 6414-2RSH (contact seals), not suffix-free 6414.", "The 143/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6414 bearing?", "a": "A 6414 deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 4629 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6414 bore code work?", "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6414 mean?", "a": "A bare 6414 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 70 mm bore?", "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6414?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6414 — the open (unsealed) execution, 70×180×42 mm per ISO 15. Quoted values: C 143 kN, C0 104 kN, Pu 3.9 kN, limiting speed 5300 r/min, mass 4950 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6414." } ], "cross_ref": [ { "equiv_sku": "6414-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6414-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7414", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6414", "material": "GCr15", "dynamic_load_kN": 143, "static_load_kN": 104, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61904 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×37×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61904 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61904 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61904-2Z (shields) and 61904-2RSH (contact seals), not suffix-free 61904.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904 bearing?", "a": "A 61904 deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61904 mean?", "a": "A bare 61904 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with a 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61904?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904 — the open (unsealed) execution, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 26000 r/min, mass 37 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61904." } ], "cross_ref": [ { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71904", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61904", "material": "GCr15", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 43000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61904-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61904-2RS runs slower and cooler-limited than the open 61904; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61904-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61904-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 43000 r/min thermal reference speed.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904-2RS bearing?", "a": "A 61904-2RS deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61904-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with a 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61904-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904-2RS1 — two contact elastomer seals over a lifetime grease fill, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 12000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61904-2RS." } ], "cross_ref": [ { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71904", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61904-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61904-2RS1", "material": "GCr15", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61905 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×42×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61905 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61905-C3. No clearance suffix means normal CN clearance.", "The open 61905 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61905-2Z (shields) and 61905-2RSH (contact seals), not suffix-free 61905.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905 bearing?", "a": "A 61905 deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 41 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61905 mean?", "a": "A bare 61905 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with a 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61905?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905 — the open (unsealed) execution, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 22000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61905." } ], "cross_ref": [ { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71905", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61905", "material": "GCr15", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "reference_speed_rpm": 36000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61905-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61905-2RS runs slower and cooler-limited than the open 61905; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61905-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61905-2RS.", "SKF catalogues the contact-sealed version as 61905-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 10000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 36000 r/min thermal reference speed.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905-2RS bearing?", "a": "A 61905-2RS deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 41 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61905-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with a 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61905-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905-2RS1 — two contact elastomer seals over a lifetime grease fill, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 10000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61905-2RS." } ], "cross_ref": [ { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71905", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61905-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61905-2RS1", "material": "GCr15", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 49, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61906 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×47×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61906 units.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61906 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61906-2Z (shields) and 61906-2RSH (contact seals), not suffix-free 61906.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906 bearing?", "a": "A 61906 deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 47 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61906 bore code work?", "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61906 mean?", "a": "A bare 61906 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with a 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61906?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906 — the open (unsealed) execution, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 49 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61906." } ], "cross_ref": [ { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71906", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61906", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 51, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61906-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61906-2RS runs slower and cooler-limited than the open 61906; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61906-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61906-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906-2RS bearing?", "a": "A 61906-2RS deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 47 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61906 bore code work?", "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61906-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with a 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61906-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 8500 r/min, mass 51 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61906-2RS." } ], "cross_ref": [ { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71906", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61906-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61906-2RS1", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61907 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×55×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61907 units.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61907 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61907-2Z (shields) and 61907-2RSH (contact seals), not suffix-free 61907.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907 bearing?", "a": "A 61907 deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61907 bore code work?", "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61907 mean?", "a": "A bare 61907 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61907?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907 — the open (unsealed) execution, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 16000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61907." } ], "cross_ref": [ { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71907", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61907", "material": "GCr15", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61907-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61907-2RS runs slower and cooler-limited than the open 61907; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61907-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61907-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61907-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 26000 r/min thermal reference speed.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907-2RS bearing?", "a": "A 61907-2RS deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61907 bore code work?", "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61907-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61907-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 7500 r/min, mass 80 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61907-2RS." } ], "cross_ref": [ { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71907", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61907-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61907-2RS1", "material": "GCr15", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61908 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×62×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61908 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61908 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61908-2Z (shields) and 61908-2RSH (contact seals), not suffix-free 61908.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908 bearing?", "a": "A 61908 deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 108 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61908 mean?", "a": "A bare 61908 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 40 mm bore?", "a": "619 is a thin section one step above 618: 62×12 mm with a 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61908?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908 — the open (unsealed) execution, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61908." } ], "cross_ref": [ { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71908", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61908", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "reference_speed_rpm": 24000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61908-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61908-2RS runs slower and cooler-limited than the open 61908; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61908-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61908-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908-2RS bearing?", "a": "A 61908-2RS deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 108 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61908-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 40 mm bore?", "a": "619 is a thin section one step above 618: 62×12 mm with a 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61908-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 6700 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61908-2RS." } ], "cross_ref": [ { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71908", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61908-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61908-2RS1", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61909 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×68×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61909 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61909.", "The open 61909 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61909-2Z (shields) and 61909-2RSH (contact seals), not suffix-free 61909.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909 bearing?", "a": "A 61909 deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61909 mean?", "a": "A bare 61909 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with a 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61909?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909 — the open (unsealed) execution, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 13000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61909." } ], "cross_ref": [ { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71909", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61909", "material": "GCr15", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61909-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61909-2RS runs slower and cooler-limited than the open 61909; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61909-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61909-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909-2RS bearing?", "a": "A 61909-2RS deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61909-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with a 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61909-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 6000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61909-2RS." } ], "cross_ref": [ { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71909", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61909-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61909-2RS1", "material": "GCr15", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61910 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×72×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61910 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61910 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61910-2Z (shields) and 61910-2RSH (contact seals), not suffix-free 61910.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910 bearing?", "a": "A 61910 deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 129 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61910 bore code work?", "a": "The last two digits of 61910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61910 mean?", "a": "A bare 61910 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with a 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61910?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910 — the open (unsealed) execution, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 12000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61910." } ], "cross_ref": [ { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71910", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61910", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61910-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61910-2RS runs slower and cooler-limited than the open 61910; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61910-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61910-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910-2RS bearing?", "a": "A 61910-2RS deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 129 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61910 bore code work?", "a": "The last two digits of 61910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61910-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with a 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61910-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 5600 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61910-2RS." } ], "cross_ref": [ { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71910", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61910-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61910-2RS1", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61911 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×80×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61911 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61911-C3. No clearance suffix means normal CN clearance.", "The open 61911 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61911-2Z (shields) and 61911-2RSH (contact seals), not suffix-free 61911.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911 bearing?", "a": "A 61911 deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 176 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61911 mean?", "a": "A bare 61911 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 55 mm bore?", "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61911?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911 — the open (unsealed) execution, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 11000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61911." } ], "cross_ref": [ { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71911", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61911", "material": "GCr15", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61911-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61911-2RS runs slower and cooler-limited than the open 61911; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61911-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61911-2RS.", "SKF catalogues the contact-sealed version as 61911-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911-2RS bearing?", "a": "A 61911-2RS deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 176 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61911-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 55 mm bore?", "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61911-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 5000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61911-2RS." } ], "cross_ref": [ { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71911", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61911-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61911-2RS1", "material": "GCr15", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804", "brand": "SKF", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.", "The open 61804 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×32×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61804 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61804.", "The open 61804 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61804-2Z (shields) and 61804-2RSH (contact seals), not suffix-free 61804.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804 bearing?", "a": "A 61804 deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 18 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61804 mean?", "a": "A bare 61804 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 20 mm bore?", "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61804?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804 — the open (unsealed) execution, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 28000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61804." } ], "cross_ref": [ { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71804", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61804", "material": "GCr15", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804-2RS", "brand": "SKF", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61804-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.", "Contact seals add drag and heat: 61804-2RS runs slower and cooler-limited than the open 61804; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61804-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61804-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804-2RS bearing?", "a": "A 61804-2RS deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 18 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61804-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 20 mm bore?", "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61804-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804-2RS1 — two contact elastomer seals over a lifetime grease fill, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 13000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61804-2RS." } ], "cross_ref": [ { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71804", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61804-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61804-2RS1", "material": "GCr15", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000", "brand": "SKF", "manufacturer_designation": "SKF 6000", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6000 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×26×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6000 units.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6000 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6000-2Z (shields) and 6000-2RSH (contact seals), not suffix-free 6000.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000 bearing?", "a": "A 6000 deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6000 mean?", "a": "A bare 6000 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000 — the open (unsealed) execution, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 40000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7000", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6000-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6000-2RS runs slower and cooler-limited than the open 6000; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6000-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6000-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6000-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 19000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 67000 r/min thermal reference speed. The single-seal catalogue number is 6000-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6000-RSH exists for arrangements that lubricate through the open side; fitting 6000-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-2RS bearing?", "a": "A 6000-2RS deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6000-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2RSH — two contact elastomer seals over a lifetime grease fill, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 19000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-2RS." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7000", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6000-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6000-RSR run faster than contact-seal 6000-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6000-2RS instead.", "The non-contact lip of 6000-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6000-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 34000 r/min limiting speed, closer to the open bearing's 67000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-RSR bearing?", "a": "A 6000-RSR deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6000-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2RSL — two low-friction non-contact elastomer seals, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 34000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-RSR." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7000", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6000-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 20, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6000-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6000-2RS for that.", "Shielded 6000-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 26 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6000-ZZ.", "SKF spells the shielded version 6000-2Z (one shield: 6000-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6000-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6000-2Z for high-contamination positions.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-ZZ bearing?", "a": "A 6000-ZZ deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6000-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2Z — two non-contact sheet-metal shields, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 34000 r/min, mass 20 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-ZZ." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7000", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001", "brand": "SKF", "manufacturer_designation": "SKF 6001", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6001 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×28×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6001 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6001 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6001-2Z (shields) and 6001-2RSH (contact seals), not suffix-free 6001.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001 bearing?", "a": "A 6001 deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6001 mean?", "a": "A bare 6001 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001 — the open (unsealed) execution, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 38000 r/min, mass 21 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7001", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6001-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6001-2RS runs slower and cooler-limited than the open 6001; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6001-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6001-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 60000 r/min thermal reference speed. The single-seal catalogue number is 6001-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6001-RSH exists for arrangements that lubricate through the open side; fitting 6001-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-2RS bearing?", "a": "A 6001-2RS deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6001-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2RSH — two contact elastomer seals over a lifetime grease fill, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 17000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-2RS." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7001", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6001-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6001-RSR run faster than contact-seal 6001-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6001-2RS instead.", "The non-contact lip of 6001-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6001-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 30000 r/min limiting speed, closer to the open bearing's 60000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-RSR bearing?", "a": "A 6001-RSR deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6001-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2RSL — two low-friction non-contact elastomer seals, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 30000 r/min, mass 21 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-RSR." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7001", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6001-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6001-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6001-2RS for that.", "Shielded 6001-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6001-2Z (one shield: 6001-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6001-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6001-2Z for high-contamination positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-ZZ bearing?", "a": "A 6001-ZZ deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6001-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2Z — two non-contact sheet-metal shields, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 30000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-ZZ." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7001", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002", "brand": "SKF", "manufacturer_designation": "SKF 6002", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6002 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×32×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6002 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6002.", "The open 6002 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6002-2Z (shields) and 6002-2RSH (contact seals), not suffix-free 6002.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002 bearing?", "a": "A 6002 deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6002 mean?", "a": "A bare 6002 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6002?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002 — the open (unsealed) execution, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 32000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7002", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6002-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6002-2RS runs slower and cooler-limited than the open 6002; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6002-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6002-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6002-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6002-RSH exists for arrangements that lubricate through the open side; fitting 6002-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-2RS bearing?", "a": "A 6002-2RS deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6002-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6002-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2RSH — two contact elastomer seals over a lifetime grease fill, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 14000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-2RS." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7002", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6002-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6002-RSR run faster than contact-seal 6002-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6002-2RS instead.", "The non-contact lip of 6002-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6002-RSR.", "SKF catalogues the low-friction seal as 6002-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-RSR bearing?", "a": "A 6002-RSR deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6002-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6002-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2RSL — two low-friction non-contact elastomer seals, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 26000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-RSR." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7002", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6002-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6002-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6002-2RS for that.", "Shielded 6002-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6002-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6002-2Z (one shield: 6002-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6002-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6002-2Z for high-contamination positions.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-ZZ bearing?", "a": "A 6002-ZZ deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6002-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6002-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2Z — two non-contact sheet-metal shields, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 26000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-ZZ." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7002", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003", "brand": "SKF", "manufacturer_designation": "SKF 6003", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6003 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×35×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6003 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6003 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6003-2Z (shields) and 6003-2RSH (contact seals), not suffix-free 6003.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003 bearing?", "a": "A 6003 deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6003 mean?", "a": "A bare 6003 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003 — the open (unsealed) execution, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 28000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7003", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6003-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6003-2RS runs slower and cooler-limited than the open 6003; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6003-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6003-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed. The single-seal catalogue number is 6003-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6003-RSH exists for arrangements that lubricate through the open side; fitting 6003-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-2RS bearing?", "a": "A 6003-2RS deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6003-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2RSH — two contact elastomer seals over a lifetime grease fill, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 13000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-2RS." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7003", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6003-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6003-RSR run faster than contact-seal 6003-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6003-2RS instead.", "The non-contact lip of 6003-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6003-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-RSR bearing?", "a": "A 6003-RSR deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6003-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2RSL — two low-friction non-contact elastomer seals, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 22000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-RSR." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7003", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6003-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 41, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6003-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6003-2RS for that.", "Shielded 6003-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6003-2Z (one shield: 6003-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6003-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6003-2Z for high-contamination positions.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-ZZ bearing?", "a": "A 6003-ZZ deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6003-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2Z — two non-contact sheet-metal shields, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 22000 r/min, mass 41 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-ZZ." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7003", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6004-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 69, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6004-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6004-RSR run faster than contact-seal 6004-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6004-2RS instead.", "The non-contact lip of 6004-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6004-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6004-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-RSR bearing?", "a": "A 6004-RSR deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6004-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2RSL — two low-friction non-contact elastomer seals, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 69 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004-RSR." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7004", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6005-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6005-RSR run faster than contact-seal 6005-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6005-2RS instead.", "The non-contact lip of 6005-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6005-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 16000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-RSR bearing?", "a": "A 6005-RSR deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6005-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6005-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2RSL — two low-friction non-contact elastomer seals, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 16000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005-RSR." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7005", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6005-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6006-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6006-RSR run faster than contact-seal 6006-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6006-2RS instead.", "The non-contact lip of 6006-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6006-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 14000 r/min limiting speed. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-RSR bearing?", "a": "A 6006-RSR deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6006-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6006-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2RZ — two low-friction non-contact elastomer seals, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6006-RSR." } ], "cross_ref": [ { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7006", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6007-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6007-RSR run faster than contact-seal 6007-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6007-2RS instead.", "The non-contact lip of 6007-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6007-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-RSR bearing?", "a": "A 6007-RSR deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6007-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2RZ — two low-friction non-contact elastomer seals, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 12000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007-RSR." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7007", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6008-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6008-RSR run faster than contact-seal 6008-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6008-2RS instead.", "The non-contact lip of 6008-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6008-RSR.", "SKF catalogues the low-friction seal as 6008-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 22000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-RSR bearing?", "a": "A 6008-RSR deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6008-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2RZ — two low-friction non-contact elastomer seals, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008-RSR." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7008", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6010-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6010-RSR run faster than contact-seal 6010-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6010-2RS instead.", "The non-contact lip of 6010-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6010-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6010-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9000 r/min limiting speed, closer to the open bearing's 18000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-RSR bearing?", "a": "A 6010-RSR deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6010-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2RZ — two low-friction non-contact elastomer seals, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 9000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010-RSR." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7010", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6012-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6012-RSR run faster than contact-seal 6012-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6012-2RS instead.", "The non-contact lip of 6012-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6012-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-RSR bearing?", "a": "A 6012-RSR deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6012-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6012-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2RZ — two low-friction non-contact elastomer seals, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 7500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012-RSR." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7012", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6015-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6015-RSR run faster than contact-seal 6015-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6015-2RS instead.", "The non-contact lip of 6015-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6015-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-RSR bearing?", "a": "A 6015-RSR deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6015-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6015-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2RZ — two low-friction non-contact elastomer seals, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 6000 r/min, mass 670 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015-RSR." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7015", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021", "brand": "SKF", "manufacturer_designation": "SKF 6021", "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": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 1600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6021 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×160×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6021 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6021 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6021-2Z (shields) and 6021-2RSH (contact seals), not suffix-free 6021.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021 bearing?", "a": "A 6021 deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6021 mean?", "a": "A bare 6021 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6021?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021 — the open (unsealed) execution, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 5300 r/min, mass 1600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021." } ], "cross_ref": [ { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7021", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6021-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6021-2RS runs slower and cooler-limited than the open 6021; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6021-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6021-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6021-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6021-RS1 exists for arrangements that lubricate through the open side; fitting 6021-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021-2RS bearing?", "a": "A 6021-2RS deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6021-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6021-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021-2RS1 — two contact elastomer seals over a lifetime grease fill, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 2400 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021-2RS." } ], "cross_ref": [ { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7021", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6021-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6021-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6021-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6021-2RS for that.", "Shielded 6021-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6021-2Z (one shield: 6021-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6021-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6021-2Z for high-contamination positions.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021-ZZ bearing?", "a": "A 6021-ZZ deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6021-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6021-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021-2Z — two non-contact sheet-metal shields, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 4300 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021-ZZ." } ], "cross_ref": [ { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7021", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6021-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022", "brand": "SKF", "manufacturer_designation": "SKF 6022", "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": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6022 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×170×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6022 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6022-C3. No clearance suffix means normal CN clearance.", "The open 6022 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6022-2Z (shields) and 6022-2RSH (contact seals), not suffix-free 6022.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022 bearing?", "a": "A 6022 deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6022 mean?", "a": "A bare 6022 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6022?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022 — the open (unsealed) execution, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 5000 r/min, mass 1950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022." } ], "cross_ref": [ { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7022", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6022-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 2000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6022-2RS runs slower and cooler-limited than the open 6022; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6022-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6022-2RS.", "SKF catalogues the contact-sealed version as 6022-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6022-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6022-RS1 exists for arrangements that lubricate through the open side; fitting 6022-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022-2RS bearing?", "a": "A 6022-2RS deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6022-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6022-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 2400 r/min, mass 2000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022-2RS." } ], "cross_ref": [ { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7022", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6022-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6022-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6022-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6022-2RS for that.", "Shielded 6022-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6022-2Z (one shield: 6022-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6022-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6022-2Z for high-contamination positions.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022-ZZ bearing?", "a": "A 6022-ZZ deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6022-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6022-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022-2Z — two non-contact sheet-metal shields, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 4000 r/min, mass 2050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022-ZZ." } ], "cross_ref": [ { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7022", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6022-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024", "brand": "SKF", "manufacturer_designation": "SKF 6024", "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": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 2100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6024 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×180×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6024 units.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6024 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6024-2Z (shields) and 6024-2RSH (contact seals), not suffix-free 6024.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024 bearing?", "a": "A 6024 deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6024 mean?", "a": "A bare 6024 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6024?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024 — the open (unsealed) execution, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 4800 r/min, mass 2100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024." } ], "cross_ref": [ { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6024-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6024-2RS runs slower and cooler-limited than the open 6024; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6024-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6024-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6024-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6024-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6024-RS1 exists for arrangements that lubricate through the open side; fitting 6024-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024-2RS bearing?", "a": "A 6024-2RS deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6024-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6024-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 2200 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024-2RS." } ], "cross_ref": [ { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6024-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6024-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6024-2RS for that.", "Shielded 6024-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6024-ZZ.", "SKF spells the shielded version 6024-2Z (one shield: 6024-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6024-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6024-2Z for high-contamination positions.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024-ZZ bearing?", "a": "A 6024-ZZ deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6024-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6024-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024-2Z — two non-contact sheet-metal shields, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 3800 r/min, mass 2200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024-ZZ." } ], "cross_ref": [ { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026", "brand": "SKF", "manufacturer_designation": "SKF 6026", "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": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6026 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6026 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6026.", "The open 6026 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6026-2Z (shields) and 6026-2RSH (contact seals), not suffix-free 6026.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026 bearing?", "a": "A 6026 deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6026 mean?", "a": "A bare 6026 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6026?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026 — the open (unsealed) execution, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 4300 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026." } ], "cross_ref": [ { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6026-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6026-2RS runs slower and cooler-limited than the open 6026; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6026-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6026-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7000 r/min thermal reference speed. The single-seal catalogue number is 6026-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6026-RS1 exists for arrangements that lubricate through the open side; fitting 6026-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026-2RS bearing?", "a": "A 6026-2RS deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6026-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6026-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 2000 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026-2RS." } ], "cross_ref": [ { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6026-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6026-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6026-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6026-2RS for that.", "Shielded 6026-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6026-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6026-2Z (one shield: 6026-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6026-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6026-2Z for high-contamination positions.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026-ZZ bearing?", "a": "A 6026-ZZ deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6026-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6026-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026-2Z — two non-contact sheet-metal shields, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 3400 r/min, mass 3350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026-ZZ." } ], "cross_ref": [ { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6026-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028", "brand": "SKF", "manufacturer_designation": "SKF 6028", "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": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6028 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×210×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6028 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6028-C3. No clearance suffix means normal CN clearance.", "The open 6028 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6028-2Z (shields) and 6028-2RSH (contact seals), not suffix-free 6028.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028 bearing?", "a": "A 6028 deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6028 mean?", "a": "A bare 6028 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 140 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (210×33 mm, 35.0 mm radial section) at 140 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6028?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028 — the open (unsealed) execution, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 4000 r/min, mass 3450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028." } ], "cross_ref": [ { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6028-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 3550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6028-2RS runs slower and cooler-limited than the open 6028; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6028-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6028-2RS.", "SKF catalogues the contact-sealed version as 6028-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6700 r/min thermal reference speed. The single-seal catalogue number is 6028-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6028-RS1 exists for arrangements that lubricate through the open side; fitting 6028-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028-2RS bearing?", "a": "A 6028-2RS deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6028-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 140 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (210×33 mm, 35.0 mm radial section) at 140 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6028-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028-2RS1 — two contact elastomer seals over a lifetime grease fill, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 1800 r/min, mass 3550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028-2RS." } ], "cross_ref": [ { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6028-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6028-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 3550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6028-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6028-2RS for that.", "Shielded 6028-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6028-2Z (one shield: 6028-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6028-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6028-2Z for high-contamination positions.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028-ZZ bearing?", "a": "A 6028-ZZ deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6028-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 140 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (210×33 mm, 35.0 mm radial section) at 140 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6028-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028-2Z — two non-contact sheet-metal shields, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 3200 r/min, mass 3550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028-ZZ." } ], "cross_ref": [ { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6028-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030", "brand": "SKF", "manufacturer_designation": "SKF 6030", "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": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6030 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6030 units.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6030 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6030-2Z (shields) and 6030-2RSH (contact seals), not suffix-free 6030.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030 bearing?", "a": "A 6030 deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6030 mean?", "a": "A bare 6030 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6030?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030 — the open (unsealed) execution, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 3800 r/min, mass 4300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030." } ], "cross_ref": [ { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6030-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 4350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6030-2RS runs slower and cooler-limited than the open 6030; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6030-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6030-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6030-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6000 r/min thermal reference speed. The single-seal catalogue number is 6030-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6030-RS1 exists for arrangements that lubricate through the open side; fitting 6030-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030-2RS bearing?", "a": "A 6030-2RS deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6030-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6030-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030-2RS1 — two contact elastomer seals over a lifetime grease fill, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 1700 r/min, mass 4350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030-2RS." } ], "cross_ref": [ { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6030-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6030-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 4400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6030-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6030-2RS for that.", "Shielded 6030-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6030-ZZ.", "SKF spells the shielded version 6030-2Z (one shield: 6030-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6030-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6030-2Z for high-contamination positions.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030-ZZ bearing?", "a": "A 6030-ZZ deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6030-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6030-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030-2Z — two non-contact sheet-metal shields, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 3000 r/min, mass 4400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030-ZZ." } ], "cross_ref": [ { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6030-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032", "brand": "SKF", "manufacturer_designation": "SKF 6032", "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": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 5200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6032 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6032 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6032.", "The open 6032 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6032-2Z (shields) and 6032-2RSH (contact seals), not suffix-free 6032.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032 bearing?", "a": "A 6032 deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6032 mean?", "a": "A bare 6032 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 160 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6032?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032 — the open (unsealed) execution, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 3600 r/min, mass 5200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032." } ], "cross_ref": [ { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6032-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 5300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6032-2RS runs slower and cooler-limited than the open 6032; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6032-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6032-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6032-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6032-RS1 exists for arrangements that lubricate through the open side; fitting 6032-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032-2RS bearing?", "a": "A 6032-2RS deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6032-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 160 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6032-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032-2RS1 — two contact elastomer seals over a lifetime grease fill, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 1600 r/min, mass 5300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032-2RS." } ], "cross_ref": [ { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6032-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6032-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 5400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6032-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6032-2RS for that.", "Shielded 6032-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6032-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6032-2Z (one shield: 6032-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6032-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6032-2Z for high-contamination positions.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032-ZZ bearing?", "a": "A 6032-ZZ deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6032-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 160 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6032-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032-2Z — two non-contact sheet-metal shields, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 2800 r/min, mass 5400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032-ZZ." } ], "cross_ref": [ { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6032-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6034", "brand": "SKF", "manufacturer_designation": "SKF 6034", "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": "steel_stamped_J", "dynamic_load_kN": 168, "static_load_kN": 173, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6034 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6034 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6034-C3. No clearance suffix means normal CN clearance.", "The open 6034 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6034-2Z (shields) and 6034-2RSH (contact seals), not suffix-free 6034.", "The 168/173 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6034 bearing?", "a": "A 6034 deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6034 mean?", "a": "A bare 6034 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 170 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6034?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6034 — the open (unsealed) execution, 170×260×42 mm per ISO 15. Quoted values: C 168 kN, C0 173 kN, Pu 5 kN, limiting speed 3200 r/min, mass 7000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6034." } ], "cross_ref": [ { "equiv_sku": "6034", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6036", "brand": "SKF", "manufacturer_designation": "SKF 6036", "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": "steel_stamped_J", "dynamic_load_kN": 190, "static_load_kN": 200, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 9100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6036 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×280×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6036 units.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6036 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6036-2Z (shields) and 6036-2RSH (contact seals), not suffix-free 6036.", "The 190/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6036 bearing?", "a": "A 6036 deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6036 bore code work?", "a": "The last two digits of 6036 are bore code 36, giving 36 × 5 = 180 mm bore. The 280 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6036 mean?", "a": "A bare 6036 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 180 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (280×46 mm, 50.0 mm radial section) at 180 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6036?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6036 — the open (unsealed) execution, 180×280×46 mm per ISO 15. Quoted values: C 190 kN, C0 200 kN, Pu 5.6 kN, limiting speed 3000 r/min, mass 9100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6036." } ], "cross_ref": [ { "equiv_sku": "6036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6038", "brand": "SKF", "manufacturer_designation": "SKF 6038", "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": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 216, "fatigue_load_limit_kN": 5.85, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 9550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 190 mm bore uses a smaller 290 mm OD than a 6238; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6038 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×290×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6038 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 290 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6038.", "The open 6038 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6038-2Z (shields) and 6038-2RSH (contact seals), not suffix-free 6038.", "The 195/216 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6038 bearing?", "a": "A 6038 deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6038 bore code work?", "a": "The last two digits of 6038 are bore code 38, giving 38 × 5 = 190 mm bore. The 290 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6038 mean?", "a": "A bare 6038 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 190 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (290×46 mm, 50.0 mm radial section) at 190 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6038?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6038 — the open (unsealed) execution, 190×290×46 mm per ISO 15. Quoted values: C 195 kN, C0 216 kN, Pu 5.85 kN, limiting speed 3000 r/min, mass 9550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6038." } ], "cross_ref": [ { "equiv_sku": "6038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6044", "brand": "SKF", "manufacturer_designation": "SKF 6044", "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": "steel_stamped_J", "dynamic_load_kN": 247, "static_load_kN": 290, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 220 mm bore uses a smaller 340 mm OD than a 6244; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6044 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×340×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6044 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6044.", "The open 6044 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6044-2Z (shields) and 6044-2RSH (contact seals), not suffix-free 6044.", "The 247/290 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6044 bearing?", "a": "A 6044 deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6044 bore code work?", "a": "The last two digits of 6044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6044 mean?", "a": "A bare 6044 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 220 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (340×56 mm, 60.0 mm radial section) at 220 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6044?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6044 — the open (unsealed) execution, 220×340×56 mm per ISO 15. Quoted values: C 247 kN, C0 290 kN, Pu 7.35 kN, limiting speed 2400 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6044." } ], "cross_ref": [ { "equiv_sku": "6044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6048", "brand": "SKF", "manufacturer_designation": "SKF 6048", "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": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 315, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 17000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6048 carries bore code 48 = 240 mm. Outside diameter 360 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 240 mm bore uses a smaller 360 mm OD than a 6248; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6048 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×360×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6048 units.", "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6048 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6048-2Z (shields) and 6048-2RSH (contact seals), not suffix-free 6048.", "The 255/315 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6048 bearing?", "a": "A 6048 deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 56 mm width (9.449 × 14.173 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6048 bore code work?", "a": "The last two digits of 6048 are bore code 48, giving 48 × 5 = 240 mm bore. The 360 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6048 mean?", "a": "A bare 6048 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 240 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (360×56 mm, 60.0 mm radial section) at 240 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6048?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6048 — the open (unsealed) execution, 240×360×56 mm per ISO 15. Quoted values: C 255 kN, C0 315 kN, Pu 7.8 kN, limiting speed 2200 r/min, mass 17000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6048." } ], "cross_ref": [ { "equiv_sku": "6048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6052", "brand": "SKF", "manufacturer_designation": "SKF 6052", "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": "steel_stamped_J", "dynamic_load_kN": 291, "static_load_kN": 375, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 25000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6052 carries bore code 52 = 260 mm. Outside diameter 400 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 260 mm bore uses a smaller 400 mm OD than a 6252; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6052 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6052 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6052-C3. No clearance suffix means normal CN clearance.", "The open 6052 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6052-2Z (shields) and 6052-2RSH (contact seals), not suffix-free 6052.", "The 291/375 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6052 bearing?", "a": "A 6052 deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 65 mm width (10.236 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6052 bore code work?", "a": "The last two digits of 6052 are bore code 52, giving 52 × 5 = 260 mm bore. The 400 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6052 mean?", "a": "A bare 6052 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 260 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (400×65 mm, 70.0 mm radial section) at 260 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6052?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6052 — the open (unsealed) execution, 260×400×65 mm per ISO 15. Quoted values: C 291 kN, C0 375 kN, Pu 8.8 kN, limiting speed 2000 r/min, mass 25000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6052." } ], "cross_ref": [ { "equiv_sku": "6052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6056", "brand": "SKF", "manufacturer_designation": "SKF 6056", "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": "steel_stamped_J", "dynamic_load_kN": 302, "static_load_kN": 405, "fatigue_load_limit_kN": 9.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 26000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6056 carries bore code 56 = 280 mm. Outside diameter 420 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 280 mm bore uses a smaller 420 mm OD than a 6256; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6056 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×420×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6056 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6056.", "The open 6056 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6056-2Z (shields) and 6056-2RSH (contact seals), not suffix-free 6056.", "The 302/405 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6056 bearing?", "a": "A 6056 deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 65 mm width (11.024 × 16.535 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6056 bore code work?", "a": "The last two digits of 6056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6056 mean?", "a": "A bare 6056 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 280 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (420×65 mm, 70.0 mm radial section) at 280 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6056?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6056 — the open (unsealed) execution, 280×420×65 mm per ISO 15. Quoted values: C 302 kN, C0 405 kN, Pu 9.3 kN, limiting speed 1900 r/min, mass 26000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6056." } ], "cross_ref": [ { "equiv_sku": "6056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800", "brand": "SKF", "manufacturer_designation": "SKF 61800", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 48000, "max_rpm": 48000, "weight_g": 5, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "The open 61800 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×19×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61800 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61800-C3. No clearance suffix means normal CN clearance.", "The open 61800 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61800-2Z (shields) and 61800-2RSH (contact seals), not suffix-free 61800.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800 bearing?", "a": "A 61800 deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61800 mean?", "a": "A bare 61800 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61800?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800 — the open (unsealed) execution, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 48000 r/min, mass 5 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800." } ], "cross_ref": [ { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61800-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "Contact seals add drag and heat: 61800-2RS runs slower and cooler-limited than the open 61800; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61800-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 19 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61800-2RS.", "SKF catalogues the contact-sealed version as 61800-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 22000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 80000 r/min thermal reference speed.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800-2RS bearing?", "a": "A 61800-2RS deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61800-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61800-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800-2RS1 — two contact elastomer seals over a lifetime grease fill, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 22000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800-2RS." } ], "cross_ref": [ { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61800-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61800-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "ZZ shields are non-contact: 61800-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61800-2RS for that.", "Shielded 61800-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 61800-2Z (one shield: 61800-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800-ZZ bearing?", "a": "A 61800-ZZ deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61800-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61800-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800-2Z — two non-contact sheet-metal shields, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 38000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800-ZZ." } ], "cross_ref": [ { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61800-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801", "brand": "SKF", "manufacturer_designation": "SKF 61801", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "reference_speed_rpm": 70000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61801 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "The open 61801 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×21×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61801 units.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61801 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61801-2Z (shields) and 61801-2RSH (contact seals), not suffix-free 61801.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801 bearing?", "a": "A 61801 deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61801 mean?", "a": "A bare 61801 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 12 mm bore?", "a": "618 is an extra-thin section: 21×5 mm, only 4.5 mm radial section at 12 mm bore, far smaller than a 6201, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61801?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801 — the open (unsealed) execution, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 43000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801." } ], "cross_ref": [ { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61801-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61801 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "Contact seals add drag and heat: 61801-2RS runs slower and cooler-limited than the open 61801; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61801-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61801-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 20000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 70000 r/min thermal reference speed.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801-2RS bearing?", "a": "A 61801-2RS deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61801-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 12 mm bore?", "a": "618 is an extra-thin section: 21×5 mm, only 4.5 mm radial section at 12 mm bore, far smaller than a 6201, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61801-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801-2RS1 — two contact elastomer seals over a lifetime grease fill, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 20000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801-2RS." } ], "cross_ref": [ { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61801-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61801 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "ZZ shields are non-contact: 61801-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61801-2RS for that.", "Shielded 61801-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 61801-2Z (one shield: 61801-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801-ZZ bearing?", "a": "A 61801-ZZ deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61801-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 12 mm bore?", "a": "618 is an extra-thin section: 21×5 mm, only 4.5 mm radial section at 12 mm bore, far smaller than a 6201, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61801-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801-2Z — two non-contact sheet-metal shields, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 36000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801-ZZ." } ], "cross_ref": [ { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802", "brand": "SKF", "manufacturer_designation": "SKF 61802", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "The open 61802 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×24×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61802 units.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61802 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61802-2Z (shields) and 61802-2RSH (contact seals), not suffix-free 61802.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802 bearing?", "a": "A 61802 deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61802 mean?", "a": "A bare 61802 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61802?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802 — the open (unsealed) execution, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 38000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802." } ], "cross_ref": [ { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61802-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "Contact seals add drag and heat: 61802-2RS runs slower and cooler-limited than the open 61802; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61802-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61802-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61802-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 60000 r/min thermal reference speed.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802-2RS bearing?", "a": "A 61802-2RS deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61802-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61802-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802-2RS1 — two contact elastomer seals over a lifetime grease fill, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 17000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802-2RS." } ], "cross_ref": [ { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61802-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "ZZ shields are non-contact: 61802-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61802-2RS for that.", "Shielded 61802-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61802-ZZ.", "SKF spells the shielded version 61802-2Z (one shield: 61802-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802-ZZ bearing?", "a": "A 61802-ZZ deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61802-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61802-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802-2Z — two non-contact sheet-metal shields, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 30000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802-ZZ." } ], "cross_ref": [ { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803", "brand": "SKF", "manufacturer_designation": "SKF 61803", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "The open 61803 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×26×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61803 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61803 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61803-2Z (shields) and 61803-2RSH (contact seals), not suffix-free 61803.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803 bearing?", "a": "A 61803 deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61803 mean?", "a": "A bare 61803 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61803?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803 — the open (unsealed) execution, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 34000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803." } ], "cross_ref": [ { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61803-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "Contact seals add drag and heat: 61803-2RS runs slower and cooler-limited than the open 61803; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61803-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61803-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 16000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-2RS bearing?", "a": "A 61803-2RS deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61803-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61803-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2RS1 — two contact elastomer seals over a lifetime grease fill, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 16000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-2RS." } ], "cross_ref": [ { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61803-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "RSR low-friction seals on 61803-RSR run faster than contact-seal 61803-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61803-2RS instead.", "The non-contact lip of 61803-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61803-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-RSR bearing?", "a": "A 61803-RSR deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61803-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61803-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2RZ — two low-friction non-contact elastomer seals, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 28000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-RSR." } ], "cross_ref": [ { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61803-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "ZZ shields are non-contact: 61803-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61803-2RS for that.", "Shielded 61803-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 61803-2Z (one shield: 61803-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-ZZ bearing?", "a": "A 61803-ZZ deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61803-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61803-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2Z — two non-contact sheet-metal shields, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 28000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-ZZ." } ], "cross_ref": [ { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61804-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.", "RSR low-friction seals on 61804-RSR run faster than contact-seal 61804-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61804-2RS instead.", "The non-contact lip of 61804-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61804-RSR.", "SKF catalogues the low-friction seal as 61804-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804-RSR bearing?", "a": "A 61804-RSR deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61804-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 20 mm bore?", "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61804-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804-2RZ — two low-friction non-contact elastomer seals, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 22000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61804-RSR." } ], "cross_ref": [ { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71804", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61804-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805", "brand": "SKF", "manufacturer_designation": "SKF 61805", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "The open 61805 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×37×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61805 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61805 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61805-2Z (shields) and 61805-2RSH (contact seals), not suffix-free 61805.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805 bearing?", "a": "A 61805 deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61805 bore code work?", "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61805 mean?", "a": "A bare 61805 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61805?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805 — the open (unsealed) execution, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 24000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805." } ], "cross_ref": [ { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71805", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61805-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "Contact seals add drag and heat: 61805-2RS runs slower and cooler-limited than the open 61805; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61805-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61805-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 11000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805-2RS bearing?", "a": "A 61805-2RS deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61805 bore code work?", "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61805-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61805-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805-2RS1 — two contact elastomer seals over a lifetime grease fill, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 11000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805-2RS." } ], "cross_ref": [ { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71805", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61805-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61805-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "RSR low-friction seals on 61805-RSR run faster than contact-seal 61805-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61805-2RS instead.", "The non-contact lip of 61805-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61805-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805-RSR bearing?", "a": "A 61805-RSR deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61805 bore code work?", "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61805-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61805-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805-2RZ — two low-friction non-contact elastomer seals, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 19000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805-RSR." } ], "cross_ref": [ { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71805", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61805-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806", "brand": "SKF", "manufacturer_designation": "SKF 61806", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "The open 61806 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×42×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61806 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61806-C3. No clearance suffix means normal CN clearance.", "The open 61806 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61806-2Z (shields) and 61806-2RSH (contact seals), not suffix-free 61806.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806 bearing?", "a": "A 61806 deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61806 mean?", "a": "A bare 61806 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61806?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806 — the open (unsealed) execution, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 20000 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806." } ], "cross_ref": [ { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71806", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61806-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "Contact seals add drag and heat: 61806-2RS runs slower and cooler-limited than the open 61806; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61806-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61806-2RS.", "SKF catalogues the contact-sealed version as 61806-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806-2RS bearing?", "a": "A 61806-2RS deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61806-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61806-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 9500 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806-2RS." } ], "cross_ref": [ { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71806", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61806-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61806-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "RSR low-friction seals on 61806-RSR run faster than contact-seal 61806-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61806-2RS instead.", "The non-contact lip of 61806-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61806-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61806-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 16000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806-RSR bearing?", "a": "A 61806-RSR deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61806-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61806-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806-2RZ — two low-friction non-contact elastomer seals, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 16000 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806-RSR." } ], "cross_ref": [ { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71806", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61806-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807", "brand": "SKF", "manufacturer_designation": "SKF 61807", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "reference_speed_rpm": 30000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 29, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "The open 61807 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×47×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61807 units.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61807 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61807-2Z (shields) and 61807-2RSH (contact seals), not suffix-free 61807.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807 bearing?", "a": "A 61807 deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61807 bore code work?", "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61807 mean?", "a": "A bare 61807 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61807?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807 — the open (unsealed) execution, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 18000 r/min, mass 29 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807." } ], "cross_ref": [ { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71807", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61807-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "Contact seals add drag and heat: 61807-2RS runs slower and cooler-limited than the open 61807; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61807-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61807-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807-2RS bearing?", "a": "A 61807-2RS deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61807 bore code work?", "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61807-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61807-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 8500 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807-2RS." } ], "cross_ref": [ { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71807", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61807-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61807-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "RSR low-friction seals on 61807-RSR run faster than contact-seal 61807-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61807-2RS instead.", "The non-contact lip of 61807-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61807-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807-RSR bearing?", "a": "A 61807-RSR deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61807 bore code work?", "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61807-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61807-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807-2RZ — two low-friction non-contact elastomer seals, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 15000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807-RSR." } ], "cross_ref": [ { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71807", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61807-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808", "brand": "SKF", "manufacturer_designation": "SKF 61808", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6208.", "The open 61808 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×52×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61808 units.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61808 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61808-2Z (shields) and 61808-2RSH (contact seals), not suffix-free 61808.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808 bearing?", "a": "A 61808 deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61808 mean?", "a": "A bare 61808 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61808?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808 — the open (unsealed) execution, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 16000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808." } ], "cross_ref": [ { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71808", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61808-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6208.", "Contact seals add drag and heat: 61808-2RS runs slower and cooler-limited than the open 61808; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61808-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61808-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61808-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 26000 r/min thermal reference speed.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808-2RS bearing?", "a": "A 61808-2RS deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61808-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61808-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 7500 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808-2RS." } ], "cross_ref": [ { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71808", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61808-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61808-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6208.", "RSR low-friction seals on 61808-RSR run faster than contact-seal 61808-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61808-2RS instead.", "The non-contact lip of 61808-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61808-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 26000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808-RSR bearing?", "a": "A 61808-RSR deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61808-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61808-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808-2RZ — two low-friction non-contact elastomer seals, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 13000 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808-RSR." } ], "cross_ref": [ { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71808", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61808-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809", "brand": "SKF", "manufacturer_designation": "SKF 61809", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "The open 61809 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×58×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61809 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61809 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61809-2Z (shields) and 61809-2RSH (contact seals), not suffix-free 61809.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809 bearing?", "a": "A 61809 deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61809 mean?", "a": "A bare 61809 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61809?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809 — the open (unsealed) execution, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 14000 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809." } ], "cross_ref": [ { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71809", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61809-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "Contact seals add drag and heat: 61809-2RS runs slower and cooler-limited than the open 61809; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61809-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61809-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 22000 r/min thermal reference speed.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809-2RS bearing?", "a": "A 61809-2RS deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61809-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61809-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 6700 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809-2RS." } ], "cross_ref": [ { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71809", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61809-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61809-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "RSR low-friction seals on 61809-RSR run faster than contact-seal 61809-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61809-2RS instead.", "The non-contact lip of 61809-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61809-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 22000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809-RSR bearing?", "a": "A 61809-RSR deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61809-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61809-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809-2RZ — two low-friction non-contact elastomer seals, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 11000 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809-RSR." } ], "cross_ref": [ { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71809", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61809-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810", "brand": "SKF", "manufacturer_designation": "SKF 61810", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "The open 61810 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×65×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61810 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 65 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61810.", "The open 61810 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61810-2Z (shields) and 61810-2RSH (contact seals), not suffix-free 61810.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810 bearing?", "a": "A 61810 deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61810 mean?", "a": "A bare 61810 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 50 mm bore?", "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61810?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810 — the open (unsealed) execution, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 13000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810." } ], "cross_ref": [ { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71810", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61810-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "Contact seals add drag and heat: 61810-2RS runs slower and cooler-limited than the open 61810; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61810-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61810-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810-2RS bearing?", "a": "A 61810-2RS deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61810-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 50 mm bore?", "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61810-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 6000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810-2RS." } ], "cross_ref": [ { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71810", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61810-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61810-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "RSR low-friction seals on 61810-RSR run faster than contact-seal 61810-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61810-2RS instead.", "The non-contact lip of 61810-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 65 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61810-RSR.", "SKF catalogues the low-friction seal as 61810-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 10000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810-RSR bearing?", "a": "A 61810-RSR deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61810-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 50 mm bore?", "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61810-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810-2RZ — two low-friction non-contact elastomer seals, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 10000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810-RSR." } ], "cross_ref": [ { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71810", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61810-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811", "brand": "SKF", "manufacturer_designation": "SKF 61811", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "The open 61811 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×72×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61811 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61811 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61811-2Z (shields) and 61811-2RSH (contact seals), not suffix-free 61811.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811 bearing?", "a": "A 61811 deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61811 mean?", "a": "A bare 61811 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61811?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811 — the open (unsealed) execution, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 12000 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811." } ], "cross_ref": [ { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71811", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61811-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "Contact seals add drag and heat: 61811-2RS runs slower and cooler-limited than the open 61811; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61811-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61811-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811-2RS bearing?", "a": "A 61811-2RS deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61811-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61811-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 5300 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811-2RS." } ], "cross_ref": [ { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71811", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61811-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61811-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "RSR low-friction seals on 61811-RSR run faster than contact-seal 61811-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61811-2RS instead.", "The non-contact lip of 61811-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61811-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9500 r/min limiting speed, closer to the open bearing's 19000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811-RSR bearing?", "a": "A 61811-RSR deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61811-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61811-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811-2RZ — two low-friction non-contact elastomer seals, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 9500 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811-RSR." } ], "cross_ref": [ { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71811", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61811-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812", "brand": "SKF", "manufacturer_designation": "SKF 61812", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "The open 61812 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×78×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61812 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61812-C3. No clearance suffix means normal CN clearance.", "The open 61812 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61812-2Z (shields) and 61812-2RSH (contact seals), not suffix-free 61812.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812 bearing?", "a": "A 61812 deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61812 mean?", "a": "A bare 61812 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61812?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812 — the open (unsealed) execution, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812." } ], "cross_ref": [ { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71812", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61812-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "Contact seals add drag and heat: 61812-2RS runs slower and cooler-limited than the open 61812; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61812-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 78 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61812-2RS.", "SKF catalogues the contact-sealed version as 61812-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812-2RS bearing?", "a": "A 61812-2RS deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61812-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61812-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 4800 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812-2RS." } ], "cross_ref": [ { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71812", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61812-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61812-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "RSR low-friction seals on 61812-RSR run faster than contact-seal 61812-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61812-2RS instead.", "The non-contact lip of 61812-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61812-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61812-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812-RSR bearing?", "a": "A 61812-RSR deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61812-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61812-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812-2RZ — two low-friction non-contact elastomer seals, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 8500 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812-RSR." } ], "cross_ref": [ { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71812", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61812-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813", "brand": "SKF", "manufacturer_designation": "SKF 61813", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "The open 61813 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×85×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61813 units.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61813 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61813-2Z (shields) and 61813-2RSH (contact seals), not suffix-free 61813.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813 bearing?", "a": "A 61813 deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61813 bore code work?", "a": "The last two digits of 61813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61813 mean?", "a": "A bare 61813 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61813?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813 — the open (unsealed) execution, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 10000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813." } ], "cross_ref": [ { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71813", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61813-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "Contact seals add drag and heat: 61813-2RS runs slower and cooler-limited than the open 61813; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61813-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61813-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813-2RS bearing?", "a": "A 61813-2RS deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61813 bore code work?", "a": "The last two digits of 61813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61813-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61813-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 4500 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813-2RS." } ], "cross_ref": [ { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71813", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61813-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61813-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "RSR low-friction seals on 61813-RSR run faster than contact-seal 61813-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61813-2RS instead.", "The non-contact lip of 61813-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61813-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8000 r/min limiting speed, closer to the open bearing's 16000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813-RSR bearing?", "a": "A 61813-RSR deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61813 bore code work?", "a": "The last two digits of 61813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61813-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61813-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813-2RZ — two low-friction non-contact elastomer seals, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 8000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813-RSR." } ], "cross_ref": [ { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71813", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61813-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814", "brand": "SKF", "manufacturer_designation": "SKF 61814", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "The open 61814 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×90×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61814 units.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61814 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61814-2Z (shields) and 61814-2RSH (contact seals), not suffix-free 61814.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814 bearing?", "a": "A 61814 deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61814 mean?", "a": "A bare 61814 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61814?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814 — the open (unsealed) execution, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 9000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814." } ], "cross_ref": [ { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71814", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61814-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "Contact seals add drag and heat: 61814-2RS runs slower and cooler-limited than the open 61814; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61814-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61814-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61814-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814-2RS bearing?", "a": "A 61814-2RS deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61814-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61814-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 4300 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814-2RS." } ], "cross_ref": [ { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71814", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61814-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61814-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "RSR low-friction seals on 61814-RSR run faster than contact-seal 61814-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61814-2RS instead.", "The non-contact lip of 61814-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61814-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814-RSR bearing?", "a": "A 61814-RSR deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61814-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61814-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814-2RZ — two low-friction non-contact elastomer seals, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 7500 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814-RSR." } ], "cross_ref": [ { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71814", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61814-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815", "brand": "SKF", "manufacturer_designation": "SKF 61815", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "The open 61815 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×95×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61815 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61815 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61815-2Z (shields) and 61815-2RSH (contact seals), not suffix-free 61815.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815 bearing?", "a": "A 61815 deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61815 mean?", "a": "A bare 61815 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61815?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815 — the open (unsealed) execution, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 8500 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815." } ], "cross_ref": [ { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71815", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61815-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "Contact seals add drag and heat: 61815-2RS runs slower and cooler-limited than the open 61815; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61815-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61815-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815-2RS bearing?", "a": "A 61815-2RS deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61815-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61815-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 4000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815-2RS." } ], "cross_ref": [ { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71815", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61815-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "RSR low-friction seals on 61815-RSR run faster than contact-seal 61815-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61815-2RS instead.", "The non-contact lip of 61815-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61815-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7000 r/min limiting speed, closer to the open bearing's 14000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815-RSR bearing?", "a": "A 61815-RSR deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61815-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61815-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815-2RZ — two low-friction non-contact elastomer seals, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 7000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815-RSR." } ], "cross_ref": [ { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71815", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61816", "brand": "SKF", "manufacturer_designation": "SKF 61816", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.61, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "The open 61816 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×100×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61816 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61816.", "The open 61816 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61816-2Z (shields) and 61816-2RSH (contact seals), not suffix-free 61816.", "The 12.7/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61816 bearing?", "a": "A 61816 deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61816 mean?", "a": "A bare 61816 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61816?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61816 — the open (unsealed) execution, 80×100×10 mm per ISO 15. Quoted values: C 12.7 kN, C0 11.2 kN, Pu 0.61 kN, limiting speed 8000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61816." } ], "cross_ref": [ { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71816", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61816-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61816-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.61, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "Contact seals add drag and heat: 61816-2RS runs slower and cooler-limited than the open 61816; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61816-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61816-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed.", "The 12.7/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61816-2RS bearing?", "a": "A 61816-2RS deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61816-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61816-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61816-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×100×10 mm per ISO 15. Quoted values: C 12.7 kN, C0 11.2 kN, Pu 0.61 kN, limiting speed 3600 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61816-2RS." } ], "cross_ref": [ { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71816", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817", "brand": "SKF", "manufacturer_designation": "SKF 61817", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "The open 61817 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×110×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61817 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61817 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61817-2Z (shields) and 61817-2RSH (contact seals), not suffix-free 61817.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817 bearing?", "a": "A 61817 deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61817 mean?", "a": "A bare 61817 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61817?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817 — the open (unsealed) execution, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 7500 r/min, mass 260 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817." } ], "cross_ref": [ { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71817", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61817-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "Contact seals add drag and heat: 61817-2RS runs slower and cooler-limited than the open 61817; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61817-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61817-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817-2RS bearing?", "a": "A 61817-2RS deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61817-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61817-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 3400 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817-2RS." } ], "cross_ref": [ { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71817", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61817-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "RSR low-friction seals on 61817-RSR run faster than contact-seal 61817-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61817-2RS instead.", "The non-contact lip of 61817-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61817-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817-RSR bearing?", "a": "A 61817-RSR deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61817-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61817-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817-2RZ — two low-friction non-contact elastomer seals, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 6000 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817-RSR." } ], "cross_ref": [ { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71817", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818", "brand": "SKF", "manufacturer_designation": "SKF 61818", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "The open 61818 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61818 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61818-C3. No clearance suffix means normal CN clearance.", "The open 61818 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61818-2Z (shields) and 61818-2RSH (contact seals), not suffix-free 61818.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818 bearing?", "a": "A 61818 deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61818 mean?", "a": "A bare 61818 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61818?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818 — the open (unsealed) execution, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 7000 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818." } ], "cross_ref": [ { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71818", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61818-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "Contact seals add drag and heat: 61818-2RS runs slower and cooler-limited than the open 61818; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61818-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61818-2RS.", "SKF catalogues the contact-sealed version as 61818-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818-2RS bearing?", "a": "A 61818-2RS deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61818-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61818-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 3200 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818-2RS." } ], "cross_ref": [ { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71818", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61818-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "RSR low-friction seals on 61818-RSR run faster than contact-seal 61818-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61818-2RS instead.", "The non-contact lip of 61818-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61818-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61818-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5600 r/min limiting speed, closer to the open bearing's 11000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818-RSR bearing?", "a": "A 61818-RSR deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61818-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61818-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818-2RZ — two low-friction non-contact elastomer seals, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 5600 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818-RSR." } ], "cross_ref": [ { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71818", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61819", "brand": "SKF", "manufacturer_designation": "SKF 61819", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.9, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.93, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "The open 61819 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×120×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61819 units.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61819 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61819-2Z (shields) and 61819-2RSH (contact seals), not suffix-free 61819.", "The 19.9/17.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61819 bearing?", "a": "A 61819 deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61819 mean?", "a": "A bare 61819 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61819?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61819 — the open (unsealed) execution, 95×120×13 mm per ISO 15. Quoted values: C 19.9 kN, C0 17.6 kN, Pu 0.93 kN, limiting speed 6700 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61819." } ], "cross_ref": [ { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71819", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61819-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61819-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.9, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.93, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "Contact seals add drag and heat: 61819-2RS runs slower and cooler-limited than the open 61819; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61819-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61819-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed.", "The 19.9/17.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61819-2RS bearing?", "a": "A 61819-2RS deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61819-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61819-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61819-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×120×13 mm per ISO 15. Quoted values: C 19.9 kN, C0 17.6 kN, Pu 0.93 kN, limiting speed 3000 r/min, mass 310 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61819-2RS." } ], "cross_ref": [ { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71819", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820", "brand": "SKF", "manufacturer_designation": "SKF 61820", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "The open 61820 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×125×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61820 units.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61820 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61820-2Z (shields) and 61820-2RSH (contact seals), not suffix-free 61820.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820 bearing?", "a": "A 61820 deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61820 mean?", "a": "A bare 61820 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61820?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820 — the open (unsealed) execution, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 6300 r/min, mass 300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820." } ], "cross_ref": [ { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71820", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61820-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 320, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "Contact seals add drag and heat: 61820-2RS runs slower and cooler-limited than the open 61820; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61820-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61820-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61820-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820-2RS bearing?", "a": "A 61820-2RS deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61820-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61820-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 3000 r/min, mass 320 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820-2RS." } ], "cross_ref": [ { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71820", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61820-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 320, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "RSR low-friction seals on 61820-RSR run faster than contact-seal 61820-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61820-2RS instead.", "The non-contact lip of 61820-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61820-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5300 r/min limiting speed, closer to the open bearing's 10000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820-RSR bearing?", "a": "A 61820-RSR deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61820-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61820-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820-2RZ — two low-friction non-contact elastomer seals, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 5300 r/min, mass 320 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820-RSR." } ], "cross_ref": [ { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71820", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821", "brand": "SKF", "manufacturer_designation": "SKF 61821", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "The open 61821 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×130×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61821 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61821 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61821-2Z (shields) and 61821-2RSH (contact seals), not suffix-free 61821.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821 bearing?", "a": "A 61821 deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61821 mean?", "a": "A bare 61821 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61821?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821 — the open (unsealed) execution, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 6300 r/min, mass 310 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821." } ], "cross_ref": [ { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61821-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 330, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "Contact seals add drag and heat: 61821-2RS runs slower and cooler-limited than the open 61821; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61821-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61821-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821-2RS bearing?", "a": "A 61821-2RS deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61821-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61821-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821-2RS1 — two contact elastomer seals over a lifetime grease fill, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 2800 r/min, mass 330 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821-2RS." } ], "cross_ref": [ { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61821-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 330, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "RSR low-friction seals on 61821-RSR run faster than contact-seal 61821-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61821-2RS instead.", "The non-contact lip of 61821-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61821-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5000 r/min limiting speed, closer to the open bearing's 10000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821-RSR bearing?", "a": "A 61821-RSR deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61821-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61821-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821-2RZ — two low-friction non-contact elastomer seals, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 5000 r/min, mass 330 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821-RSR." } ], "cross_ref": [ { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822", "brand": "SKF", "manufacturer_designation": "SKF 61822", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 470, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "The open 61822 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61822 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61822.", "The open 61822 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61822-2Z (shields) and 61822-2RSH (contact seals), not suffix-free 61822.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822 bearing?", "a": "A 61822 deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61822 mean?", "a": "A bare 61822 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822 — the open (unsealed) execution, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 5600 r/min, mass 470 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822." } ], "cross_ref": [ { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61822-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "Contact seals add drag and heat: 61822-2RS runs slower and cooler-limited than the open 61822; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61822-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61822-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822-2RS bearing?", "a": "A 61822-2RS deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61822-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 2600 r/min, mass 600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822-2RS." } ], "cross_ref": [ { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61822-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61822-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "RSR low-friction seals on 61822-RSR run faster than contact-seal 61822-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61822-2RS instead.", "The non-contact lip of 61822-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61822-RSR.", "SKF catalogues the low-friction seal as 61822-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 4500 r/min limiting speed, closer to the open bearing's 9500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822-RSR bearing?", "a": "A 61822-RSR deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61822-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822-2RZ — two low-friction non-contact elastomer seals, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 4500 r/min, mass 600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822-RSR." } ], "cross_ref": [ { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61822-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824", "brand": "SKF", "manufacturer_designation": "SKF 61824", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 510, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "The open 61824 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×150×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61824 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61824-C3. No clearance suffix means normal CN clearance.", "The open 61824 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61824-2Z (shields) and 61824-2RSH (contact seals), not suffix-free 61824.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824 bearing?", "a": "A 61824 deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61824 bore code work?", "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61824 mean?", "a": "A bare 61824 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61824?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824 — the open (unsealed) execution, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 5300 r/min, mass 510 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824." } ], "cross_ref": [ { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61824-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "Contact seals add drag and heat: 61824-2RS runs slower and cooler-limited than the open 61824; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61824-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61824-2RS.", "SKF catalogues the contact-sealed version as 61824-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824-2RS bearing?", "a": "A 61824-2RS deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61824 bore code work?", "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61824-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61824-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 2400 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824-2RS." } ], "cross_ref": [ { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61824-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "RSR low-friction seals on 61824-RSR run faster than contact-seal 61824-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61824-2RS instead.", "The non-contact lip of 61824-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61824-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61824-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 4300 r/min limiting speed, closer to the open bearing's 8500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824-RSR bearing?", "a": "A 61824-RSR deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61824 bore code work?", "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61824-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61824-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824-2RZ — two low-friction non-contact elastomer seals, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 4300 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824-RSR." } ], "cross_ref": [ { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826", "brand": "SKF", "manufacturer_designation": "SKF 61826", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "The open 61826 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×165×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61826 units.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61826 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61826-2Z (shields) and 61826-2RSH (contact seals), not suffix-free 61826.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826 bearing?", "a": "A 61826 deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61826 mean?", "a": "A bare 61826 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61826?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826 — the open (unsealed) execution, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 4800 r/min, mass 750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826." } ], "cross_ref": [ { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61826-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "Contact seals add drag and heat: 61826-2RS runs slower and cooler-limited than the open 61826; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61826-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61826-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61826-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826-2RS bearing?", "a": "A 61826-2RS deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61826-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61826-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 2200 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826-2RS." } ], "cross_ref": [ { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61826-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61826-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "RSR low-friction seals on 61826-RSR run faster than contact-seal 61826-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61826-2RS instead.", "The non-contact lip of 61826-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 130 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61826-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 3800 r/min limiting speed, closer to the open bearing's 8000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826-RSR bearing?", "a": "A 61826-RSR deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61826-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61826-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826-2RZ — two low-friction non-contact elastomer seals, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 3800 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826-RSR." } ], "cross_ref": [ { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61826-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828", "brand": "SKF", "manufacturer_designation": "SKF 61828", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 820, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "The open 61828 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×175×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61828 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 175 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61828.", "The open 61828 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61828-2Z (shields) and 61828-2RSH (contact seals), not suffix-free 61828.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828 bearing?", "a": "A 61828 deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61828 mean?", "a": "A bare 61828 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61828?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828 — the open (unsealed) execution, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 4500 r/min, mass 820 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828." } ], "cross_ref": [ { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61828-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 990, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "Contact seals add drag and heat: 61828-2RS runs slower and cooler-limited than the open 61828; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61828-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61828-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828-2RS bearing?", "a": "A 61828-2RS deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61828-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61828-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828-2RS1 — two contact elastomer seals over a lifetime grease fill, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 2000 r/min, mass 990 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828-2RS." } ], "cross_ref": [ { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61828-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61828-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 990, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "RSR low-friction seals on 61828-RSR run faster than contact-seal 61828-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61828-2RS instead.", "The non-contact lip of 61828-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 140 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 175 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61828-RSR.", "SKF catalogues the low-friction seal as 61828-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 3600 r/min limiting speed, closer to the open bearing's 7500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828-RSR bearing?", "a": "A 61828-RSR deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61828-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61828-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828-2RZ — two low-friction non-contact elastomer seals, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 3600 r/min, mass 990 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828-RSR." } ], "cross_ref": [ { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61828-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61830", "brand": "SKF", "manufacturer_designation": "SKF 61830", "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": "steel_stamped_J", "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": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "The open 61830 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×190×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61830 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61830-C3. No clearance suffix means normal CN clearance.", "The open 61830 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61830-2Z (shields) and 61830-2RSH (contact seals), not suffix-free 61830.", "The 48.8/61 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61830 bearing?", "a": "A 61830 deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61830 mean?", "a": "A bare 61830 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 150 mm bore?", "a": "618 is an extra-thin section: 190×20 mm, only 20.0 mm radial section at 150 mm bore, far smaller than a 6230, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61830?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61830 — the open (unsealed) execution, 150×190×20 mm per ISO 15. Quoted values: C 48.8 kN, C0 61 kN, Pu 1.96 kN, limiting speed 4300 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61830." } ], "cross_ref": [ { "equiv_sku": "61830", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61832", "brand": "SKF", "manufacturer_designation": "SKF 61832", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49.4, "static_load_kN": 64, "fatigue_load_limit_kN": 2, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "The open 61832 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×200×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61832 units.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61832 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61832-2Z (shields) and 61832-2RSH (contact seals), not suffix-free 61832.", "The 49.4/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61832 bearing?", "a": "A 61832 deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61832 bore code work?", "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61832 mean?", "a": "A bare 61832 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61832?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61832 — the open (unsealed) execution, 160×200×20 mm per ISO 15. Quoted values: C 49.4 kN, C0 64 kN, Pu 2 kN, limiting speed 4000 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61832." } ], "cross_ref": [ { "equiv_sku": "61832", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61834", "brand": "SKF", "manufacturer_designation": "SKF 61834", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 61.8, "static_load_kN": 78, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "The open 61834 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×215×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61834 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61834.", "The open 61834 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61834-2Z (shields) and 61834-2RSH (contact seals), not suffix-free 61834.", "The 61.8/78 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61834 bearing?", "a": "A 61834 deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61834 mean?", "a": "A bare 61834 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 170 mm bore?", "a": "618 is an extra-thin section: 215×22 mm, only 22.5 mm radial section at 170 mm bore, far smaller than a 6234, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61834?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61834 — the open (unsealed) execution, 170×215×22 mm per ISO 15. Quoted values: C 61.8 kN, C0 78 kN, Pu 2.4 kN, limiting speed 3600 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61834." } ], "cross_ref": [ { "equiv_sku": "61834", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61836", "brand": "SKF", "manufacturer_designation": "SKF 61836", "series": "61800-series", "type": "deep_groove", "d_mm": 180, "D_mm": 225, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 62.4, "static_load_kN": 81.5, "fatigue_load_limit_kN": 2.45, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 1750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61836 carries bore code 36 = 180 mm. Outside diameter 225 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 180 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6236.", "The open 61836 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×225×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61836 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61836-C3. No clearance suffix means normal CN clearance.", "The open 61836 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61836-2Z (shields) and 61836-2RSH (contact seals), not suffix-free 61836.", "The 62.4/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61836 bearing?", "a": "A 61836 deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61836 bore code work?", "a": "The last two digits of 61836 are bore code 36, giving 36 × 5 = 180 mm bore. The 225 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61836 mean?", "a": "A bare 61836 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 180 mm bore?", "a": "618 is an extra-thin section: 225×22 mm, only 22.5 mm radial section at 180 mm bore, far smaller than a 6236, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61836?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61836 — the open (unsealed) execution, 180×225×22 mm per ISO 15. Quoted values: C 62.4 kN, C0 81.5 kN, Pu 2.45 kN, limiting speed 3400 r/min, mass 1750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61836." } ], "cross_ref": [ { "equiv_sku": "61836", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61838", "brand": "SKF", "manufacturer_designation": "SKF 61838", "series": "61800-series", "type": "deep_groove", "d_mm": 190, "D_mm": 240, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 98, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61838 carries bore code 38 = 190 mm. Outside diameter 240 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.", "The open 61838 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×240×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61838 units.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61838 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61838-2Z (shields) and 61838-2RSH (contact seals), not suffix-free 61838.", "The 76.1/98 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61838 bearing?", "a": "A 61838 deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61838 bore code work?", "a": "The last two digits of 61838 are bore code 38, giving 38 × 5 = 190 mm bore. The 240 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61838 mean?", "a": "A bare 61838 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 190 mm bore?", "a": "618 is an extra-thin section: 240×24 mm, only 25.0 mm radial section at 190 mm bore, far smaller than a 6238, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61838?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61838 — the open (unsealed) execution, 190×240×24 mm per ISO 15. Quoted values: C 76.1 kN, C0 98 kN, Pu 2.8 kN, limiting speed 3200 r/min, mass 2250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61838." } ], "cross_ref": [ { "equiv_sku": "61838", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61840", "brand": "SKF", "manufacturer_designation": "SKF 61840", "series": "61800-series", "type": "deep_groove", "d_mm": 200, "D_mm": 250, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 102, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61840 carries bore code 40 = 200 mm. Outside diameter 250 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 200 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6240.", "The open 61840 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×250×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61840 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 250 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61840.", "The open 61840 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61840-2Z (shields) and 61840-2RSH (contact seals), not suffix-free 61840.", "The 76.1/102 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61840 bearing?", "a": "A 61840 deep-groove ball bearing has a 200 mm bore, 250 mm outer diameter and 24 mm width (7.874 × 9.843 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61840 bore code work?", "a": "The last two digits of 61840 are bore code 40, giving 40 × 5 = 200 mm bore. The 250 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61840 mean?", "a": "A bare 61840 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 200 mm bore?", "a": "618 is an extra-thin section: 250×24 mm, only 25.0 mm radial section at 200 mm bore, far smaller than a 6240, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61840?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61840 — the open (unsealed) execution, 200×250×24 mm per ISO 15. Quoted values: C 76.1 kN, C0 102 kN, Pu 2.9 kN, limiting speed 3200 r/min, mass 2350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61840." } ], "cross_ref": [ { "equiv_sku": "61840", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61844", "brand": "SKF", "manufacturer_designation": "SKF 61844", "series": "61800-series", "type": "deep_groove", "d_mm": 220, "D_mm": 270, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 78, "static_load_kN": 110, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 2550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61844 carries bore code 44 = 220 mm. Outside diameter 270 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 220 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6244.", "The open 61844 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×270×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61844 units.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61844 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61844-2Z (shields) and 61844-2RSH (contact seals), not suffix-free 61844.", "The 78/110 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61844 bearing?", "a": "A 61844 deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61844 bore code work?", "a": "The last two digits of 61844 are bore code 44, giving 44 × 5 = 220 mm bore. The 270 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61844 mean?", "a": "A bare 61844 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 220 mm bore?", "a": "618 is an extra-thin section: 270×24 mm, only 25.0 mm radial section at 220 mm bore, far smaller than a 6244, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61844?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61844 — the open (unsealed) execution, 220×270×24 mm per ISO 15. Quoted values: C 78 kN, C0 110 kN, Pu 3 kN, limiting speed 2800 r/min, mass 2550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61844." } ], "cross_ref": [ { "equiv_sku": "61844", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61848", "brand": "SKF", "manufacturer_designation": "SKF 61848", "series": "61800-series", "type": "deep_groove", "d_mm": 240, "D_mm": 300, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 108, "static_load_kN": 150, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 3900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61848 carries bore code 48 = 240 mm. Outside diameter 300 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 240 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6248.", "The open 61848 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×300×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61848 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61848-C3. No clearance suffix means normal CN clearance.", "The open 61848 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61848-2Z (shields) and 61848-2RSH (contact seals), not suffix-free 61848.", "The 108/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61848 bearing?", "a": "A 61848 deep-groove ball bearing has a 240 mm bore, 300 mm outer diameter and 28 mm width (9.449 × 11.811 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61848 bore code work?", "a": "The last two digits of 61848 are bore code 48, giving 48 × 5 = 240 mm bore. The 300 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61848 mean?", "a": "A bare 61848 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 240 mm bore?", "a": "618 is an extra-thin section: 300×28 mm, only 30.0 mm radial section at 240 mm bore, far smaller than a 6248, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61848?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61848 — the open (unsealed) execution, 240×300×28 mm per ISO 15. Quoted values: C 108 kN, C0 150 kN, Pu 3.8 kN, limiting speed 2600 r/min, mass 3900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61848." } ], "cross_ref": [ { "equiv_sku": "61848", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61852", "brand": "SKF", "manufacturer_designation": "SKF 61852", "series": "61800-series", "type": "deep_groove", "d_mm": 260, "D_mm": 320, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 163, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61852 carries bore code 52 = 260 mm. Outside diameter 320 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 260 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6252.", "The open 61852 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×320×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61852 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 320 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61852.", "The open 61852 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61852-2Z (shields) and 61852-2RSH (contact seals), not suffix-free 61852.", "The 111/163 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61852 bearing?", "a": "A 61852 deep-groove ball bearing has a 260 mm bore, 320 mm outer diameter and 28 mm width (10.236 × 12.598 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61852 bore code work?", "a": "The last two digits of 61852 are bore code 52, giving 52 × 5 = 260 mm bore. The 320 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61852 mean?", "a": "A bare 61852 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 260 mm bore?", "a": "618 is an extra-thin section: 320×28 mm, only 30.0 mm radial section at 260 mm bore, far smaller than a 6252, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61852?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61852 — the open (unsealed) execution, 260×320×28 mm per ISO 15. Quoted values: C 111 kN, C0 163 kN, Pu 4 kN, limiting speed 2400 r/min, mass 4150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61852." } ], "cross_ref": [ { "equiv_sku": "61852", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61856", "brand": "SKF", "manufacturer_designation": "SKF 61856", "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": "steel_stamped_J", "dynamic_load_kN": 138, "static_load_kN": 200, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 3400, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 6250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61856 carries bore code 56 = 280 mm. Outside diameter 350 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 280 mm bore has only a 35.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6256.", "The open 61856 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×350×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61856 units.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61856 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61856-2Z (shields) and 61856-2RSH (contact seals), not suffix-free 61856.", "The 138/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61856 bearing?", "a": "A 61856 deep-groove ball bearing has a 280 mm bore, 350 mm outer diameter and 33 mm width (11.024 × 13.78 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61856 bore code work?", "a": "The last two digits of 61856 are bore code 56, giving 56 × 5 = 280 mm bore. The 350 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61856 mean?", "a": "A bare 61856 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 280 mm bore?", "a": "618 is an extra-thin section: 350×33 mm, only 35.0 mm radial section at 280 mm bore, far smaller than a 6256, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61856?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61856 — the open (unsealed) execution, 280×350×33 mm per ISO 15. Quoted values: C 138 kN, C0 200 kN, Pu 4.75 kN, limiting speed 2200 r/min, mass 6250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61856." } ], "cross_ref": [ { "equiv_sku": "61856", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61860", "brand": "SKF", "manufacturer_designation": "SKF 61860", "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": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 245, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 8900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61860 carries bore code 60 = 300 mm. Outside diameter 380 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 300 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6260.", "The open 61860 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×380×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61860 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61860-C3. No clearance suffix means normal CN clearance.", "The open 61860 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61860-2Z (shields) and 61860-2RSH (contact seals), not suffix-free 61860.", "The 172/245 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61860 bearing?", "a": "A 61860 deep-groove ball bearing has a 300 mm bore, 380 mm outer diameter and 38 mm width (11.811 × 14.961 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61860 bore code work?", "a": "The last two digits of 61860 are bore code 60, giving 60 × 5 = 300 mm bore. The 380 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61860 mean?", "a": "A bare 61860 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 300 mm bore?", "a": "618 is an extra-thin section: 380×38 mm, only 40.0 mm radial section at 300 mm bore, far smaller than a 6260, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61860?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61860 — the open (unsealed) execution, 300×380×38 mm per ISO 15. Quoted values: C 172 kN, C0 245 kN, Pu 5.6 kN, limiting speed 2000 r/min, mass 8900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61860." } ], "cross_ref": [ { "equiv_sku": "61860", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61864", "brand": "SKF", "manufacturer_designation": "SKF 61864", "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": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 255, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 9500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61864 carries bore code 64 = 320 mm. Outside diameter 400 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 320 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6264.", "The open 61864 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×400×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61864 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 400 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61864.", "The open 61864 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61864-2Z (shields) and 61864-2RSH (contact seals), not suffix-free 61864.", "The 172/255 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61864 bearing?", "a": "A 61864 deep-groove ball bearing has a 320 mm bore, 400 mm outer diameter and 38 mm width (12.598 × 15.748 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61864 bore code work?", "a": "The last two digits of 61864 are bore code 64, giving 64 × 5 = 320 mm bore. The 400 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61864 mean?", "a": "A bare 61864 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 320 mm bore?", "a": "618 is an extra-thin section: 400×38 mm, only 40.0 mm radial section at 320 mm bore, far smaller than a 6264, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61864?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61864 — the open (unsealed) execution, 320×400×38 mm per ISO 15. Quoted values: C 172 kN, C0 255 kN, Pu 5.7 kN, limiting speed 1900 r/min, mass 9500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61864." } ], "cross_ref": [ { "equiv_sku": "61864", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61868", "brand": "SKF", "manufacturer_designation": "SKF 61868", "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": "steel_stamped_J", "dynamic_load_kN": 178, "static_load_kN": 275, "fatigue_load_limit_kN": 6, "reference_speed_rpm": 2800, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61868 carries bore code 68 = 340 mm. Outside diameter 420 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 340 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 340 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6268.", "The open 61868 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×420×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61868 units.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61868 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61868-2Z (shields) and 61868-2RSH (contact seals), not suffix-free 61868.", "The 178/275 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61868 bearing?", "a": "A 61868 deep-groove ball bearing has a 340 mm bore, 420 mm outer diameter and 38 mm width (13.386 × 16.535 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61868 bore code work?", "a": "The last two digits of 61868 are bore code 68, giving 68 × 5 = 340 mm bore. The 420 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61868 mean?", "a": "A bare 61868 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 340 mm bore?", "a": "618 is an extra-thin section: 420×38 mm, only 40.0 mm radial section at 340 mm bore, far smaller than a 6268, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61868?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61868 — the open (unsealed) execution, 340×420×38 mm per ISO 15. Quoted values: C 178 kN, C0 275 kN, Pu 6 kN, limiting speed 1800 r/min, mass 10000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61868." } ], "cross_ref": [ { "equiv_sku": "61868", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900", "brand": "SKF", "manufacturer_designation": "SKF 61900", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61900 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×22×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61900 units.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61900 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61900-2Z (shields) and 61900-2RSH (contact seals), not suffix-free 61900.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900 bearing?", "a": "A 61900 deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61900 mean?", "a": "A bare 61900 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 10 mm bore?", "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6200 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61900?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900 — the open (unsealed) execution, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 45000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900." } ], "cross_ref": [ { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61900-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61900-2RS runs slower and cooler-limited than the open 61900; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61900-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61900-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 20000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 70000 r/min thermal reference speed.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900-2RS bearing?", "a": "A 61900-2RS deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61900-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 10 mm bore?", "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6200 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61900-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900-2RS1 — two contact elastomer seals over a lifetime grease fill, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 20000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900-2RS." } ], "cross_ref": [ { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61900-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61900-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61900-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61900-2RS for that.", "Shielded 61900-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 61900-2Z (one shield: 61900-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900-ZZ bearing?", "a": "A 61900-ZZ deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61900-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 10 mm bore?", "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6200 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61900-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900-2Z — two non-contact sheet-metal shields, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 36000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900-ZZ." } ], "cross_ref": [ { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61900-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901", "brand": "SKF", "manufacturer_designation": "SKF 61901", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61901 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×24×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61901 units.", "Shaft and housing fillets must clear the bearing chamfer so the 6 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61901 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61901-2Z (shields) and 61901-2RSH (contact seals), not suffix-free 61901.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901 bearing?", "a": "A 61901 deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61901 mean?", "a": "A bare 61901 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 12 mm bore?", "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6201 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61901?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901 — the open (unsealed) execution, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 40000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901." } ], "cross_ref": [ { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61901-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61901-2RS runs slower and cooler-limited than the open 61901; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61901-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61901-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61901-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 19000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 67000 r/min thermal reference speed.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901-2RS bearing?", "a": "A 61901-2RS deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61901-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 12 mm bore?", "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6201 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61901-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901-2RS1 — two contact elastomer seals over a lifetime grease fill, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 19000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901-2RS." } ], "cross_ref": [ { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61901-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61901-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "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, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61901-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61901-2RS for that.", "Shielded 61901-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61901-ZZ.", "SKF spells the shielded version 61901-2Z (one shield: 61901-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901-ZZ bearing?", "a": "A 61901-ZZ deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61901-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 12 mm bore?", "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6201 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61901-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901-2Z — two non-contact sheet-metal shields, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 32000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901-ZZ." } ], "cross_ref": [ { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61901-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902", "brand": "SKF", "manufacturer_designation": "SKF 61902", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61902 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×28×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61902 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61902 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61902-2Z (shields) and 61902-2RSH (contact seals), not suffix-free 61902.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902 bearing?", "a": "A 61902 deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61902 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61902 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61902 mean?", "a": "A bare 61902 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61902?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902 — the open (unsealed) execution, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 34000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902." } ], "cross_ref": [ { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61902-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61902-2RS runs slower and cooler-limited than the open 61902; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61902-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61902-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 16000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-2RS bearing?", "a": "A 61902-2RS deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61902 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61902 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61902-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61902-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2RS1 — two contact elastomer seals over a lifetime grease fill, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 16000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-2RS." } ], "cross_ref": [ { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61902-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "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, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61902-RSR run faster than contact-seal 61902-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61902-2RS instead.", "The non-contact lip of 61902-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61902-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-RSR bearing?", "a": "A 61902-RSR deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61902 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61902 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61902-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61902-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2RZ — two low-friction non-contact elastomer seals, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 28000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-RSR." } ], "cross_ref": [ { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61902-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "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, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61902-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61902-2RS for that.", "Shielded 61902-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 61902-2Z (one shield: 61902-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-ZZ bearing?", "a": "A 61902-ZZ deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61902 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61902 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61902-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61902-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2Z — two non-contact sheet-metal shields, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 28000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-ZZ." } ], "cross_ref": [ { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903", "brand": "SKF", "manufacturer_designation": "SKF 61903", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "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, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61903 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×30×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61903 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61903.", "The open 61903 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61903-2Z (shields) and 61903-2RSH (contact seals), not suffix-free 61903.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903 bearing?", "a": "A 61903 deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61903 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61903 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61903 mean?", "a": "A bare 61903 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61903?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903 — the open (unsealed) execution, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 32000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903." } ], "cross_ref": [ { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61903-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61903-2RS runs slower and cooler-limited than the open 61903; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61903-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61903-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-2RS bearing?", "a": "A 61903-2RS deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61903 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61903 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61903-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61903-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2RS1 — two contact elastomer seals over a lifetime grease fill, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 14000 r/min, mass 17 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-2RS." } ], "cross_ref": [ { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61903-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61903-RSR run faster than contact-seal 61903-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61903-2RS instead.", "The non-contact lip of 61903-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61903-RSR.", "SKF catalogues the low-friction seal as 61903-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-RSR bearing?", "a": "A 61903-RSR deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61903 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61903 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61903-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61903-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2RZ — two low-friction non-contact elastomer seals, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 26000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-RSR." } ], "cross_ref": [ { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61903-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61903-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61903-2RS for that.", "Shielded 61903-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61903-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 61903-2Z (one shield: 61903-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-ZZ bearing?", "a": "A 61903-ZZ deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61903 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61903 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61903-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61903-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2Z — two non-contact sheet-metal shields, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 26000 r/min, mass 17 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-ZZ." } ], "cross_ref": [ { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61904-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 43000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61904-RSR run faster than contact-seal 61904-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61904-2RS instead.", "The non-contact lip of 61904-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61904-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 20000 r/min limiting speed, closer to the open bearing's 43000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904-RSR bearing?", "a": "A 61904-RSR deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61904-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with a 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61904-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904-2RZ — two low-friction non-contact elastomer seals, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 20000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61904-RSR." } ], "cross_ref": [ { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71904", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61904-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61905-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "reference_speed_rpm": 36000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61905-RSR run faster than contact-seal 61905-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61905-2RS instead.", "The non-contact lip of 61905-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61905-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61905-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 18000 r/min limiting speed, closer to the open bearing's 36000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905-RSR bearing?", "a": "A 61905-RSR deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61905-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with a 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61905-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905-2RZ — two low-friction non-contact elastomer seals, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 18000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61905-RSR." } ], "cross_ref": [ { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71905", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61905-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61906-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 51, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61906-RSR run faster than contact-seal 61906-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61906-2RS instead.", "The non-contact lip of 61906-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61906-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906-RSR bearing?", "a": "A 61906-RSR deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61906 bore code work?", "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61906-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with a 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61906-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906-2RZ — two low-friction non-contact elastomer seals, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 15000 r/min, mass 51 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61906-RSR." } ], "cross_ref": [ { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71906", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61906-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61907-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61907-RSR run faster than contact-seal 61907-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61907-2RS instead.", "The non-contact lip of 61907-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61907-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 26000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907-RSR bearing?", "a": "A 61907-RSR deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61907 bore code work?", "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61907-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61907-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907-2RZ — two low-friction non-contact elastomer seals, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 13000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61907-RSR." } ], "cross_ref": [ { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71907", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61907-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61908-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61908-RSR run faster than contact-seal 61908-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61908-2RS instead.", "The non-contact lip of 61908-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61908-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908-RSR bearing?", "a": "A 61908-RSR deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61908-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 40 mm bore?", "a": "619 is a thin section one step above 618: 62×12 mm with a 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61908-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908-2RZ — two low-friction non-contact elastomer seals, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 12000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61908-RSR." } ], "cross_ref": [ { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71908", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61908-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61909-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61909-RSR run faster than contact-seal 61909-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61909-2RS instead.", "The non-contact lip of 61909-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61909-RSR.", "SKF catalogues the low-friction seal as 61909-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 10000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909-RSR bearing?", "a": "A 61909-RSR deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61909-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with a 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61909-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909-2RZ — two low-friction non-contact elastomer seals, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 10000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61909-RSR." } ], "cross_ref": [ { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71909", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61909-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61910-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61910-RSR run faster than contact-seal 61910-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61910-2RS instead.", "The non-contact lip of 61910-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61910-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9500 r/min limiting speed, closer to the open bearing's 19000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910-RSR bearing?", "a": "A 61910-RSR deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61910 bore code work?", "a": "The last two digits of 61910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61910-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with a 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61910-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910-2RZ — two low-friction non-contact elastomer seals, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 9500 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61910-RSR." } ], "cross_ref": [ { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71910", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61910-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61911-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61911-RSR run faster than contact-seal 61911-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61911-2RS instead.", "The non-contact lip of 61911-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61911-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61911-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911-RSR bearing?", "a": "A 61911-RSR deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61911-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 55 mm bore?", "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61911-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911-2RZ — two low-friction non-contact elastomer seals, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 8500 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61911-RSR." } ], "cross_ref": [ { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71911", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61911-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912", "brand": "SKF", "manufacturer_designation": "SKF 61912", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 12, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61912 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×85×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61912 units.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61912 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61912-2Z (shields) and 61912-2RSH (contact seals), not suffix-free 61912.", "The 16.5/12 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912 bearing?", "a": "A 61912 deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61912 mean?", "a": "A bare 61912 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61912?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912 — the open (unsealed) execution, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 12 kN, Pu 0.6 kN, limiting speed 10000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912." } ], "cross_ref": [ { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71912", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61912-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 12, "fatigue_load_limit_kN": 0.6, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61912-2RS runs slower and cooler-limited than the open 61912; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61912-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61912-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed.", "The 16.5/12 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912-2RS bearing?", "a": "A 61912-2RS deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61912-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61912-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 12 kN, Pu 0.6 kN, limiting speed 4500 r/min, mass 210 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912-2RS." } ], "cross_ref": [ { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71912", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61912-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61912-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 14.3, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61912-RSR run faster than contact-seal 61912-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61912-2RS instead.", "The non-contact lip of 61912-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61912-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8000 r/min limiting speed, closer to the open bearing's 16000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.5/14.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912-RSR bearing?", "a": "A 61912-RSR deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61912-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61912-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912-2RZ — two low-friction non-contact elastomer seals, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14.3 kN, Pu 0.6 kN, limiting speed 8000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912-RSR." } ], "cross_ref": [ { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71912", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61912-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913", "brand": "SKF", "manufacturer_designation": "SKF 61913", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61913 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×90×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61913 units.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61913 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61913-2Z (shields) and 61913-2RSH (contact seals), not suffix-free 61913.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913 bearing?", "a": "A 61913 deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61913 mean?", "a": "A bare 61913 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61913?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913 — the open (unsealed) execution, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 9500 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913." } ], "cross_ref": [ { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71913", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61913-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61913-2RS runs slower and cooler-limited than the open 61913; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61913-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61913-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61913-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913-2RS bearing?", "a": "A 61913-2RS deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61913-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61913-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 4300 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913-2RS." } ], "cross_ref": [ { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71913", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61913-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61913-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61913-RSR run faster than contact-seal 61913-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61913-2RS instead.", "The non-contact lip of 61913-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61913-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913-RSR bearing?", "a": "A 61913-RSR deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61913-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61913-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913-2RZ — two low-friction non-contact elastomer seals, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 7500 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913-RSR." } ], "cross_ref": [ { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71913", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61913-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914", "brand": "SKF", "manufacturer_designation": "SKF 61914", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 340, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61914 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×100×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61914 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61914 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61914-2Z (shields) and 61914-2RSH (contact seals), not suffix-free 61914.", "The 23.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914 bearing?", "a": "A 61914 deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61914 mean?", "a": "A bare 61914 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61914?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914 — the open (unsealed) execution, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 18.3 kN, Pu 0.9 kN, limiting speed 8500 r/min, mass 340 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914." } ], "cross_ref": [ { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71914", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61914-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61914-2RS runs slower and cooler-limited than the open 61914; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61914-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61914-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed.", "The 23.8/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914-2RS bearing?", "a": "A 61914-2RS deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61914-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61914-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 4000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914-2RS." } ], "cross_ref": [ { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71914", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61914-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61914-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61914-RSR run faster than contact-seal 61914-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61914-2RS instead.", "The non-contact lip of 61914-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61914-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7000 r/min limiting speed, closer to the open bearing's 14000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 23.8/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914-RSR bearing?", "a": "A 61914-RSR deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61914-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61914-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914-2RZ — two low-friction non-contact elastomer seals, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 7000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914-RSR." } ], "cross_ref": [ { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71914", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61914-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915", "brand": "SKF", "manufacturer_designation": "SKF 61915", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 19.3, "fatigue_load_limit_kN": 0.965, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61915 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×105×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61915 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 105 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61915.", "The open 61915 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61915-2Z (shields) and 61915-2RSH (contact seals), not suffix-free 61915.", "The 24.2/19.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915 bearing?", "a": "A 61915 deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61915 bore code work?", "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61915 mean?", "a": "A bare 61915 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61915?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915 — the open (unsealed) execution, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 19.3 kN, Pu 0.965 kN, limiting speed 8000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915." } ], "cross_ref": [ { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71915", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61915-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 22.4, "fatigue_load_limit_kN": 0.965, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61915-2RS runs slower and cooler-limited than the open 61915; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61915-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61915-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed.", "The 24.2/22.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915-2RS bearing?", "a": "A 61915-2RS deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61915 bore code work?", "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61915-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61915-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 22.4 kN, Pu 0.965 kN, limiting speed 3600 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915-2RS." } ], "cross_ref": [ { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71915", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61915-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61915-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 22.4, "fatigue_load_limit_kN": 0.965, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61915-RSR run faster than contact-seal 61915-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61915-2RS instead.", "The non-contact lip of 61915-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 105 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61915-RSR.", "SKF catalogues the low-friction seal as 61915-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6300 r/min limiting speed, closer to the open bearing's 13000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 24.2/22.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915-RSR bearing?", "a": "A 61915-RSR deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61915 bore code work?", "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61915-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61915-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915-2RZ — two low-friction non-contact elastomer seals, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 22.4 kN, Pu 0.965 kN, limiting speed 6300 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915-RSR." } ], "cross_ref": [ { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71915", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61915-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916", "brand": "SKF", "manufacturer_designation": "SKF 61916", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61916 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×110×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61916 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61916 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61916-2Z (shields) and 61916-2RSH (contact seals), not suffix-free 61916.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916 bearing?", "a": "A 61916 deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61916 mean?", "a": "A bare 61916 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61916?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916 — the open (unsealed) execution, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 7500 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916." } ], "cross_ref": [ { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71916", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61916-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61916-2RS runs slower and cooler-limited than the open 61916; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61916-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61916-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916-2RS bearing?", "a": "A 61916-2RS deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61916-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61916-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 3400 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916-2RS." } ], "cross_ref": [ { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71916", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61916-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61916-RSR run faster than contact-seal 61916-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61916-2RS instead.", "The non-contact lip of 61916-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61916-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916-RSR bearing?", "a": "A 61916-RSR deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61916-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61916-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916-2RZ — two low-friction non-contact elastomer seals, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 6000 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916-RSR." } ], "cross_ref": [ { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71916", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61917", "brand": "SKF", "manufacturer_designation": "SKF 61917", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 31.9, "static_load_kN": 30, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61917 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×120×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61917 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61917-C3. No clearance suffix means normal CN clearance.", "The open 61917 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61917-2Z (shields) and 61917-2RSH (contact seals), not suffix-free 61917.", "The 31.9/30 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61917 bearing?", "a": "A 61917 deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61917 bore code work?", "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61917 mean?", "a": "A bare 61917 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61917?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61917 — the open (unsealed) execution, 85×120×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 30 kN, Pu 1.25 kN, limiting speed 7000 r/min, mass 550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61917." } ], "cross_ref": [ { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "71917", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61918", "brand": "SKF", "manufacturer_designation": "SKF 61918", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.2, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 590, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61918 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×125×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61918 units.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61918 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61918-2Z (shields) and 61918-2RSH (contact seals), not suffix-free 61918.", "The 33.2/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61918 bearing?", "a": "A 61918 deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61918 mean?", "a": "A bare 61918 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61918?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61918 — the open (unsealed) execution, 90×125×18 mm per ISO 15. Quoted values: C 33.2 kN, C0 31.5 kN, Pu 1.29 kN, limiting speed 6700 r/min, mass 590 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61918." } ], "cross_ref": [ { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "71918", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61919", "brand": "SKF", "manufacturer_designation": "SKF 61919", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.8, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61919 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×130×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61919 units.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61919 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61919-2Z (shields) and 61919-2RSH (contact seals), not suffix-free 61919.", "The 33.8/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61919 bearing?", "a": "A 61919 deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61919 mean?", "a": "A bare 61919 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61919?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61919 — the open (unsealed) execution, 95×130×18 mm per ISO 15. Quoted values: C 33.8 kN, C0 33.5 kN, Pu 1.34 kN, limiting speed 6300 r/min, mass 610 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61919." } ], "cross_ref": [ { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71919", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61919-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61919-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.8, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.34, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61919-2RS runs slower and cooler-limited than the open 61919; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61919-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61919-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61919-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 33.8/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61919-2RS bearing?", "a": "A 61919-2RS deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61919-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61919-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61919-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×130×18 mm per ISO 15. Quoted values: C 33.8 kN, C0 33.5 kN, Pu 1.34 kN, limiting speed 3000 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61919-2RS." } ], "cross_ref": [ { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71919", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61919-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61920", "brand": "SKF", "manufacturer_designation": "SKF 61920", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.3, "static_load_kN": 41.5, "fatigue_load_limit_kN": 1.63, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 830, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61920 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×140×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61920 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61920 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61920-2Z (shields) and 61920-2RSH (contact seals), not suffix-free 61920.", "The 42.3/41.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61920 bearing?", "a": "A 61920 deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61920 mean?", "a": "A bare 61920 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61920?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61920 — the open (unsealed) execution, 100×140×20 mm per ISO 15. Quoted values: C 42.3 kN, C0 41.5 kN, Pu 1.63 kN, limiting speed 6000 r/min, mass 830 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61920." } ], "cross_ref": [ { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "71920", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61921", "brand": "SKF", "manufacturer_designation": "SKF 61921", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44.2, "static_load_kN": 44, "fatigue_load_limit_kN": 1.7, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 870, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61921 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×145×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61921 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 145 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61921.", "The open 61921 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61921-2Z (shields) and 61921-2RSH (contact seals), not suffix-free 61921.", "The 44.2/44 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61921 bearing?", "a": "A 61921 deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61921 mean?", "a": "A bare 61921 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61921?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61921 — the open (unsealed) execution, 105×145×20 mm per ISO 15. Quoted values: C 44.2 kN, C0 44 kN, Pu 1.7 kN, limiting speed 5600 r/min, mass 870 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61921." } ], "cross_ref": [ { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61921-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61922", "brand": "SKF", "manufacturer_designation": "SKF 61922", "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": "steel_stamped_J", "dynamic_load_kN": 43.6, "static_load_kN": 45, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61922 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×150×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61922 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61922 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61922-2Z (shields) and 61922-2RSH (contact seals), not suffix-free 61922.", "The 43.6/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61922 bearing?", "a": "A 61922 deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61922 mean?", "a": "A bare 61922 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61922?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61922 — the open (unsealed) execution, 110×150×20 mm per ISO 15. Quoted values: C 43.6 kN, C0 45 kN, Pu 1.66 kN, limiting speed 5600 r/min, mass 900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61922." } ], "cross_ref": [ { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61924", "brand": "SKF", "manufacturer_designation": "SKF 61924", "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": "steel_stamped_J", "dynamic_load_kN": 55.3, "static_load_kN": 57, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61924 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×165×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61924 units.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61924 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61924-2Z (shields) and 61924-2RSH (contact seals), not suffix-free 61924.", "The 55.3/57 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61924 bearing?", "a": "A 61924 deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61924 bore code work?", "a": "The last two digits of 61924 are bore code 24, giving 24 × 5 = 120 mm bore. The 165 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61924 mean?", "a": "A bare 61924 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 120 mm bore?", "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61924?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61924 — the open (unsealed) execution, 120×165×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 57 kN, Pu 2.04 kN, limiting speed 5000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61924." } ], "cross_ref": [ { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61924-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61926", "brand": "SKF", "manufacturer_designation": "SKF 61926", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 65, "static_load_kN": 67, "fatigue_load_limit_kN": 2.28, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 130 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61926 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×180×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61926 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61926 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61926-2Z (shields) and 61926-2RSH (contact seals), not suffix-free 61926.", "The 65/67 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61926 bearing?", "a": "A 61926 deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61926 bore code work?", "a": "The last two digits of 61926 are bore code 26, giving 26 × 5 = 130 mm bore. The 180 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61926 mean?", "a": "A bare 61926 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61926?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61926 — the open (unsealed) execution, 130×180×24 mm per ISO 15. Quoted values: C 65 kN, C0 67 kN, Pu 2.28 kN, limiting speed 4500 r/min, mass 1600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61926." } ], "cross_ref": [ { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61926-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61928", "brand": "SKF", "manufacturer_designation": "SKF 61928", "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": "steel_stamped_J", "dynamic_load_kN": 66.3, "static_load_kN": 72, "fatigue_load_limit_kN": 2.36, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61928 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×190×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61928 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61928 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61928-2Z (shields) and 61928-2RSH (contact seals), not suffix-free 61928.", "The 66.3/72 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61928 bearing?", "a": "A 61928 deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61928 bore code work?", "a": "The last two digits of 61928 are bore code 28, giving 28 × 5 = 140 mm bore. The 190 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61928 mean?", "a": "A bare 61928 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61928?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61928 — the open (unsealed) execution, 140×190×24 mm per ISO 15. Quoted values: C 66.3 kN, C0 72 kN, Pu 2.36 kN, limiting speed 4300 r/min, mass 1700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61928." } ], "cross_ref": [ { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61928-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61932", "brand": "SKF", "manufacturer_designation": "SKF 61932", "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": "steel_stamped_J", "dynamic_load_kN": 92.3, "static_load_kN": 98, "fatigue_load_limit_kN": 3.05, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61932 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×220×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61932 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61932 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61932-2Z (shields) and 61932-2RSH (contact seals), not suffix-free 61932.", "The 92.3/98 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61932 bearing?", "a": "A 61932 deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61932 bore code work?", "a": "The last two digits of 61932 are bore code 32, giving 32 × 5 = 160 mm bore. The 220 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61932 mean?", "a": "A bare 61932 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 160 mm bore?", "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61932?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61932 — the open (unsealed) execution, 160×220×28 mm per ISO 15. Quoted values: C 92.3 kN, C0 98 kN, Pu 3.05 kN, limiting speed 3800 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61932." } ], "cross_ref": [ { "equiv_sku": "61932", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61936", "brand": "SKF", "manufacturer_designation": "SKF 61936", "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": "steel_stamped_J", "dynamic_load_kN": 119, "static_load_kN": 134, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 5000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61936 carries bore code 36 = 180 mm. Outside diameter 250 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (35.0 mm section height at 180 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61936 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×250×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61936 units.", "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61936 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61936-2Z (shields) and 61936-2RSH (contact seals), not suffix-free 61936.", "The 119/134 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61936 bearing?", "a": "A 61936 deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61936 bore code work?", "a": "The last two digits of 61936 are bore code 36, giving 36 × 5 = 180 mm bore. The 250 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61936 mean?", "a": "A bare 61936 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 180 mm bore?", "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61936?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61936 — the open (unsealed) execution, 180×250×33 mm per ISO 15. Quoted values: C 119 kN, C0 134 kN, Pu 3.9 kN, limiting speed 3200 r/min, mass 5000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61936." } ], "cross_ref": [ { "equiv_sku": "61936", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61938", "brand": "SKF", "manufacturer_designation": "SKF 61938", "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": "steel_stamped_J", "dynamic_load_kN": 117, "static_load_kN": 134, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61938 carries bore code 38 = 190 mm. Outside diameter 260 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (35.0 mm section height at 190 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61938 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×260×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61938 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61938 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61938-2Z (shields) and 61938-2RSH (contact seals), not suffix-free 61938.", "The 117/134 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61938 bearing?", "a": "A 61938 deep-groove ball bearing has a 190 mm bore, 260 mm outer diameter and 33 mm width (7.48 × 10.236 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61938 bore code work?", "a": "The last two digits of 61938 are bore code 38, giving 38 × 5 = 190 mm bore. The 260 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61938 mean?", "a": "A bare 61938 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 190 mm bore?", "a": "619 is a thin section one step above 618: 260×33 mm with a 35.0 mm radial section at 190 mm bore; a 6238 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61938?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61938 — the open (unsealed) execution, 190×260×33 mm per ISO 15. Quoted values: C 117 kN, C0 134 kN, Pu 3.8 kN, limiting speed 3200 r/min, mass 4500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61938." } ], "cross_ref": [ { "equiv_sku": "61938", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61940", "brand": "SKF", "manufacturer_designation": "SKF 61940", "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": "steel_stamped_J", "dynamic_load_kN": 148, "static_load_kN": 166, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 6300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61940 carries bore code 40 = 200 mm. Outside diameter 280 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 200 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61940 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×280×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61940 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61940 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61940-2Z (shields) and 61940-2RSH (contact seals), not suffix-free 61940.", "The 148/166 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61940 bearing?", "a": "A 61940 deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61940 bore code work?", "a": "The last two digits of 61940 are bore code 40, giving 40 × 5 = 200 mm bore. The 280 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61940 mean?", "a": "A bare 61940 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 200 mm bore?", "a": "619 is a thin section one step above 618: 280×38 mm with a 40.0 mm radial section at 200 mm bore; a 6240 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61940?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61940 — the open (unsealed) execution, 200×280×38 mm per ISO 15. Quoted values: C 148 kN, C0 166 kN, Pu 4.55 kN, limiting speed 3000 r/min, mass 6300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61940." } ], "cross_ref": [ { "equiv_sku": "61940", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61944", "brand": "SKF", "manufacturer_designation": "SKF 61944", "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": "steel_stamped_J", "dynamic_load_kN": 151, "static_load_kN": 180, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 6800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 220 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61944 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×300×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61944 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61944 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61944-2Z (shields) and 61944-2RSH (contact seals), not suffix-free 61944.", "The 151/180 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61944 bearing?", "a": "A 61944 deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61944 bore code work?", "a": "The last two digits of 61944 are bore code 44, giving 44 × 5 = 220 mm bore. The 300 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61944 mean?", "a": "A bare 61944 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 220 mm bore?", "a": "619 is a thin section one step above 618: 300×38 mm with a 40.0 mm radial section at 220 mm bore; a 6244 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61944?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61944 — the open (unsealed) execution, 220×300×38 mm per ISO 15. Quoted values: C 151 kN, C0 180 kN, Pu 4.75 kN, limiting speed 2600 r/min, mass 6800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61944." } ], "cross_ref": [ { "equiv_sku": "61944", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61948", "brand": "SKF", "manufacturer_designation": "SKF 61948", "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": "steel_stamped_J", "dynamic_load_kN": 159, "static_load_kN": 200, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 7300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61948 carries bore code 48 = 240 mm. Outside diameter 320 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 240 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61948 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×320×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61948 units.", "A 240 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61948 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61948-2Z (shields) and 61948-2RSH (contact seals), not suffix-free 61948.", "The 159/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61948 bearing?", "a": "A 61948 deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61948 bore code work?", "a": "The last two digits of 61948 are bore code 48, giving 48 × 5 = 240 mm bore. The 320 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61948 mean?", "a": "A bare 61948 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 240 mm bore?", "a": "619 is a thin section one step above 618: 320×38 mm with a 40.0 mm radial section at 240 mm bore; a 6248 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61948?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61948 — the open (unsealed) execution, 240×320×38 mm per ISO 15. Quoted values: C 159 kN, C0 200 kN, Pu 5.1 kN, limiting speed 2400 r/min, mass 7300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61948." } ], "cross_ref": [ { "equiv_sku": "61948", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61952", "brand": "SKF", "manufacturer_designation": "SKF 61952", "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": "steel_stamped_J", "dynamic_load_kN": 212, "static_load_kN": 270, "fatigue_load_limit_kN": 6.55, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61952 carries bore code 52 = 260 mm. Outside diameter 360 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (50.0 mm section height at 260 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61952 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×360×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61952 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61952 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61952-2Z (shields) and 61952-2RSH (contact seals), not suffix-free 61952.", "The 212/270 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61952 bearing?", "a": "A 61952 deep-groove ball bearing has a 260 mm bore, 360 mm outer diameter and 46 mm width (10.236 × 14.173 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61952 bore code work?", "a": "The last two digits of 61952 are bore code 52, giving 52 × 5 = 260 mm bore. The 360 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61952 mean?", "a": "A bare 61952 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 260 mm bore?", "a": "619 is a thin section one step above 618: 360×46 mm with a 50.0 mm radial section at 260 mm bore; a 6252 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61952?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61952 — the open (unsealed) execution, 260×360×46 mm per ISO 15. Quoted values: C 212 kN, C0 270 kN, Pu 6.55 kN, limiting speed 2200 r/min, mass 12000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61952." } ], "cross_ref": [ { "equiv_sku": "61952", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61956", "brand": "SKF", "manufacturer_designation": "SKF 61956", "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": "steel_stamped_J", "dynamic_load_kN": 216, "static_load_kN": 285, "fatigue_load_limit_kN": 6.7, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61956 carries bore code 56 = 280 mm. Outside diameter 380 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (50.0 mm section height at 280 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61956 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×380×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61956 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61956 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61956-2Z (shields) and 61956-2RSH (contact seals), not suffix-free 61956.", "The 216/285 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61956 bearing?", "a": "A 61956 deep-groove ball bearing has a 280 mm bore, 380 mm outer diameter and 46 mm width (11.024 × 14.961 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61956 bore code work?", "a": "The last two digits of 61956 are bore code 56, giving 56 × 5 = 280 mm bore. The 380 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61956 mean?", "a": "A bare 61956 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 280 mm bore?", "a": "619 is a thin section one step above 618: 380×46 mm with a 50.0 mm radial section at 280 mm bore; a 6256 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61956?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61956 — the open (unsealed) execution, 280×380×46 mm per ISO 15. Quoted values: C 216 kN, C0 285 kN, Pu 6.7 kN, limiting speed 2000 r/min, mass 12000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61956." } ], "cross_ref": [ { "equiv_sku": "61956", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61960", "brand": "SKF", "manufacturer_designation": "SKF 61960", "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": "steel_stamped_J", "dynamic_load_kN": 270, "static_load_kN": 375, "fatigue_load_limit_kN": 8.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 19000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61960 carries bore code 60 = 300 mm. Outside diameter 420 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (60.0 mm section height at 300 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61960 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×420×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61960 units.", "A 300 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61960 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61960-2Z (shields) and 61960-2RSH (contact seals), not suffix-free 61960.", "The 270/375 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61960 bearing?", "a": "A 61960 deep-groove ball bearing has a 300 mm bore, 420 mm outer diameter and 56 mm width (11.811 × 16.535 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61960 bore code work?", "a": "The last two digits of 61960 are bore code 60, giving 60 × 5 = 300 mm bore. The 420 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61960 mean?", "a": "A bare 61960 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 300 mm bore?", "a": "619 is a thin section one step above 618: 420×56 mm with a 60.0 mm radial section at 300 mm bore; a 6260 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61960?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61960 — the open (unsealed) execution, 300×420×56 mm per ISO 15. Quoted values: C 270 kN, C0 375 kN, Pu 8.3 kN, limiting speed 1900 r/min, mass 19000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61960." } ], "cross_ref": [ { "equiv_sku": "61960", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6200-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6200-RSR run faster than contact-seal 6200-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6200-2RS instead.", "The non-contact lip of 6200-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6200-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-RSR bearing?", "a": "A 6200-RSR deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6200-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 10 mm bore?", "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6300 on the same bore is larger and higher-rated; a 6000 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6200-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2RSL — two low-friction non-contact elastomer seals, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 28000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200-RSR." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7200", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6201-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6201-RSR run faster than contact-seal 6201-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6201-2RS instead.", "The non-contact lip of 6201-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6201-RSR.", "SKF catalogues the low-friction seal as 6201-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-RSR bearing?", "a": "A 6201-RSR deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6201-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 12 mm bore?", "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6301 on the same bore is larger and higher-rated; a 6001 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6201-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2RSL — two low-friction non-contact elastomer seals, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 26000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201-RSR." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7201", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6202-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 46, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6202-RSR run faster than contact-seal 6202-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6202-2RS instead.", "The non-contact lip of 6202-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6202-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 43000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-RSR bearing?", "a": "A 6202-RSR deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6202-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2RSL — two low-friction non-contact elastomer seals, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 22000 r/min, mass 46 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202-RSR." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7202", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6203-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6303 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6203-RSR run faster than contact-seal 6203-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6203-2RS instead.", "The non-contact lip of 6203-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6203-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6203-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-RSR bearing?", "a": "A 6203-RSR deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6203-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with a 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6203-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2RSL — two low-friction non-contact elastomer seals, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 19000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203-RSR." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7203", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6204-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6204-RSR run faster than contact-seal 6204-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6204-2RS instead.", "The non-contact lip of 6204-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6204-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 17000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-RSR bearing?", "a": "A 6204-RSR deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6204-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2RSL — two low-friction non-contact elastomer seals, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 17000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204-RSR." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7204", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6205-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6205-RSR run faster than contact-seal 6205-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6205-2RS instead.", "The non-contact lip of 6205-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6205-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 14000 r/min limiting speed, closer to the open bearing's 28000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-RSR bearing?", "a": "A 6205-RSR deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6205-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6205-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2RSL — two low-friction non-contact elastomer seals, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 14000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205-RSR." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7205", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6206-2RZ", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6206-RSR run faster than contact-seal 6206-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6206-2RS instead.", "The non-contact lip of 6206-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6206-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-RSR bearing?", "a": "A 6206-RSR deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6206-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2RZ — two low-friction non-contact elastomer seals, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 12000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206-RSR." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7206", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6208-2RZ", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6208-RSR run faster than contact-seal 6208-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6208-2RS instead.", "The non-contact lip of 6208-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6208-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9000 r/min limiting speed, closer to the open bearing's 18000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-RSR bearing?", "a": "A 6208-RSR deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6208-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6208-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2RZ — two low-friction non-contact elastomer seals, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 9000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208-RSR." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7208", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224", "brand": "SKF", "manufacturer_designation": "SKF 6224", "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": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 5250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "The open 6224 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×215×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6224 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6224 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6224-2Z (shields) and 6224-2RSH (contact seals), not suffix-free 6224.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224 bearing?", "a": "A 6224 deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6224 mean?", "a": "A bare 6224 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6224?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224 — the open (unsealed) execution, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 4000 r/min, mass 5250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224." } ], "cross_ref": [ { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6224-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 5350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6224-2RS runs slower and cooler-limited than the open 6224; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6224-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6224-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1900 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6300 r/min thermal reference speed. The single-seal catalogue number is 6224-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6224-RS1 exists for arrangements that lubricate through the open side; fitting 6224-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224-2RS bearing?", "a": "A 6224-2RS deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6224-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6224-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 1900 r/min, mass 5350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224-2RS." } ], "cross_ref": [ { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6224-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 5350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6224-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6224-2RS for that.", "Shielded 6224-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6224-2Z (one shield: 6224-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6224-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6224-2Z for high-contamination positions.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224-ZZ bearing?", "a": "A 6224-ZZ deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6224-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6224-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224-2Z — two non-contact sheet-metal shields, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 3200 r/min, mass 5350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224-ZZ." } ], "cross_ref": [ { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226", "brand": "SKF", "manufacturer_designation": "SKF 6226", "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": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 130 mm bore; before upgrading to a 6326 for extra capacity, confirm the housing accepts a 230 mm OD and 40 mm width — it is not a drop-in swap.", "The open 6226 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×230×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6226 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6226 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6226-2Z (shields) and 6226-2RSH (contact seals), not suffix-free 6226.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226 bearing?", "a": "A 6226 deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6226 mean?", "a": "A bare 6226 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6226?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226 — the open (unsealed) execution, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 3600 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226." } ], "cross_ref": [ { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6226-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 6000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 130 mm bore; before upgrading to a 6326 for extra capacity, confirm the housing accepts a 230 mm OD and 40 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6226-2RS runs slower and cooler-limited than the open 6226; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6226-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6226-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6226-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6226-RS1 exists for arrangements that lubricate through the open side; fitting 6226-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226-2RS bearing?", "a": "A 6226-2RS deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6226-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6226-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 1800 r/min, mass 6000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226-2RS." } ], "cross_ref": [ { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6226-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 6000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 130 mm bore; before upgrading to a 6326 for extra capacity, confirm the housing accepts a 230 mm OD and 40 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6226-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6226-2RS for that.", "Shielded 6226-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6226-2Z (one shield: 6226-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6226-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6226-2Z for high-contamination positions.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226-ZZ bearing?", "a": "A 6226-ZZ deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6226-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6226-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226-2Z — two non-contact sheet-metal shields, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 3000 r/min, mass 6000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226-ZZ." } ], "cross_ref": [ { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6228", "brand": "SKF", "manufacturer_designation": "SKF 6228", "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": "steel_stamped_J", "dynamic_load_kN": 165, "static_load_kN": 150, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 7750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "The open 6228 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×250×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6228 units.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6228 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6228-2Z (shields) and 6228-2RSH (contact seals), not suffix-free 6228.", "The 165/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6228 bearing?", "a": "A 6228 deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6228 bore code work?", "a": "The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6228 mean?", "a": "A bare 6228 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6228?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6228 — the open (unsealed) execution, 140×250×42 mm per ISO 15. Quoted values: C 165 kN, C0 150 kN, Pu 4.55 kN, limiting speed 3400 r/min, mass 7750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6228." } ], "cross_ref": [ { "equiv_sku": "6228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6230", "brand": "SKF", "manufacturer_designation": "SKF 6230", "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": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 166, "fatigue_load_limit_kN": 4.9, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "The open 6230 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×270×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6230 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6230 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6230-2Z (shields) and 6230-2RSH (contact seals), not suffix-free 6230.", "The 174/166 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6230 bearing?", "a": "A 6230 deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6230 bore code work?", "a": "The last two digits of 6230 are bore code 30, giving 30 × 5 = 150 mm bore. The 270 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6230 mean?", "a": "A bare 6230 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6230?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6230 — the open (unsealed) execution, 150×270×45 mm per ISO 15. Quoted values: C 174 kN, C0 166 kN, Pu 4.9 kN, limiting speed 3200 r/min, mass 10000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6230." } ], "cross_ref": [ { "equiv_sku": "6230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6232", "brand": "SKF", "manufacturer_designation": "SKF 6232", "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": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 186, "fatigue_load_limit_kN": 5.3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 13000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6232 carries bore code 32 = 160 mm. Outside diameter 290 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 160 mm bore; before upgrading to a 6332 for extra capacity, confirm the housing accepts a 290 mm OD and 48 mm width — it is not a drop-in swap.", "The open 6232 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×290×48 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6232 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6232 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6232-2Z (shields) and 6232-2RSH (contact seals), not suffix-free 6232.", "The 186/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6232 bearing?", "a": "A 6232 deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6232 bore code work?", "a": "The last two digits of 6232 are bore code 32, giving 32 × 5 = 160 mm bore. The 290 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6232 mean?", "a": "A bare 6232 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 160 mm bore?", "a": "The '2' is the light diameter series: 290×48 mm with a 65.0 mm radial section at 160 mm bore. A 6332 on the same bore is larger and higher-rated; a 6032 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6232?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6232 — the open (unsealed) execution, 160×290×48 mm per ISO 15. Quoted values: C 186 kN, C0 186 kN, Pu 5.3 kN, limiting speed 3000 r/min, mass 13000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6232." } ], "cross_ref": [ { "equiv_sku": "6232", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6234", "brand": "SKF", "manufacturer_designation": "SKF 6234", "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": "steel_stamped_J", "dynamic_load_kN": 212, "static_load_kN": 224, "fatigue_load_limit_kN": 6.1, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6234 carries bore code 34 = 170 mm. Outside diameter 310 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 170 mm bore; before upgrading to a 6334 for extra capacity, confirm the housing accepts a 310 mm OD and 52 mm width — it is not a drop-in swap.", "The open 6234 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×310×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6234 units.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6234 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6234-2Z (shields) and 6234-2RSH (contact seals), not suffix-free 6234.", "The 212/224 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6234 bearing?", "a": "A 6234 deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6234 bore code work?", "a": "The last two digits of 6234 are bore code 34, giving 34 × 5 = 170 mm bore. The 310 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6234 mean?", "a": "A bare 6234 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 170 mm bore?", "a": "The '2' is the light diameter series: 310×52 mm with a 70.0 mm radial section at 170 mm bore. A 6334 on the same bore is larger and higher-rated; a 6034 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6234?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6234 — the open (unsealed) execution, 170×310×52 mm per ISO 15. Quoted values: C 212 kN, C0 224 kN, Pu 6.1 kN, limiting speed 2800 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6234." } ], "cross_ref": [ { "equiv_sku": "6234", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6236", "brand": "SKF", "manufacturer_designation": "SKF 6236", "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": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 240, "fatigue_load_limit_kN": 6.4, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6236 carries bore code 36 = 180 mm. Outside diameter 320 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 180 mm bore; before upgrading to a 6336 for extra capacity, confirm the housing accepts a 320 mm OD and 52 mm width — it is not a drop-in swap.", "The open 6236 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×320×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6236 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6236 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6236-2Z (shields) and 6236-2RSH (contact seals), not suffix-free 6236.", "The 229/240 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6236 bearing?", "a": "A 6236 deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6236 bore code work?", "a": "The last two digits of 6236 are bore code 36, giving 36 × 5 = 180 mm bore. The 320 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6236 mean?", "a": "A bare 6236 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 180 mm bore?", "a": "The '2' is the light diameter series: 320×52 mm with a 70.0 mm radial section at 180 mm bore. A 6336 on the same bore is larger and higher-rated; a 6036 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6236?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6236 — the open (unsealed) execution, 180×320×52 mm per ISO 15. Quoted values: C 229 kN, C0 240 kN, Pu 6.4 kN, limiting speed 2600 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6236." } ], "cross_ref": [ { "equiv_sku": "6236", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6238", "brand": "SKF", "manufacturer_designation": "SKF 6238", "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": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 280, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 19500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6238 carries bore code 38 = 190 mm. Outside diameter 340 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 190 mm bore; before upgrading to a 6338 for extra capacity, confirm the housing accepts a 340 mm OD and 55 mm width — it is not a drop-in swap.", "The open 6238 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×340×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6238 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6238 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6238-2Z (shields) and 6238-2RSH (contact seals), not suffix-free 6238.", "The 255/280 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6238 bearing?", "a": "A 6238 deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6238 bore code work?", "a": "The last two digits of 6238 are bore code 38, giving 38 × 5 = 190 mm bore. The 340 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6238 mean?", "a": "A bare 6238 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 190 mm bore?", "a": "The '2' is the light diameter series: 340×55 mm with a 75.0 mm radial section at 190 mm bore. A 6338 on the same bore is larger and higher-rated; a 6038 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6238?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6238 — the open (unsealed) execution, 190×340×55 mm per ISO 15. Quoted values: C 255 kN, C0 280 kN, Pu 7.35 kN, limiting speed 2400 r/min, mass 19500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6238." } ], "cross_ref": [ { "equiv_sku": "6238", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6240", "brand": "SKF", "manufacturer_designation": "SKF 6240", "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": "steel_stamped_J", "dynamic_load_kN": 270, "static_load_kN": 310, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 23500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6240 carries bore code 40 = 200 mm. Outside diameter 360 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 200 mm bore; before upgrading to a 6340 for extra capacity, confirm the housing accepts a 360 mm OD and 58 mm width — it is not a drop-in swap.", "The open 6240 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×360×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6240 units.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6240 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6240-2Z (shields) and 6240-2RSH (contact seals), not suffix-free 6240.", "The 270/310 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6240 bearing?", "a": "A 6240 deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6240 bore code work?", "a": "The last two digits of 6240 are bore code 40, giving 40 × 5 = 200 mm bore. The 360 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6240 mean?", "a": "A bare 6240 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 200 mm bore?", "a": "The '2' is the light diameter series: 360×58 mm with a 80.0 mm radial section at 200 mm bore. A 6340 on the same bore is larger and higher-rated; a 6040 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6240?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6240 — the open (unsealed) execution, 200×360×58 mm per ISO 15. Quoted values: C 270 kN, C0 310 kN, Pu 7.8 kN, limiting speed 2200 r/min, mass 23500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6240." } ], "cross_ref": [ { "equiv_sku": "6240", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6244", "brand": "SKF", "manufacturer_designation": "SKF 6244", "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": "steel_stamped_J", "dynamic_load_kN": 296, "static_load_kN": 365, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 33500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6244 carries bore code 44 = 220 mm. Outside diameter 400 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 220 mm bore; before upgrading to a 6344 for extra capacity, confirm the housing accepts a 400 mm OD and 65 mm width — it is not a drop-in swap.", "The open 6244 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6244 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6244 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6244-2Z (shields) and 6244-2RSH (contact seals), not suffix-free 6244.", "The 296/365 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6244 bearing?", "a": "A 6244 deep-groove ball bearing has a 220 mm bore, 400 mm outer diameter and 65 mm width (8.661 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6244 bore code work?", "a": "The last two digits of 6244 are bore code 44, giving 44 × 5 = 220 mm bore. The 400 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6244 mean?", "a": "A bare 6244 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 220 mm bore?", "a": "The '2' is the light diameter series: 400×65 mm with a 90.0 mm radial section at 220 mm bore. A 6344 on the same bore is larger and higher-rated; a 6044 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6244?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6244 — the open (unsealed) execution, 220×400×65 mm per ISO 15. Quoted values: C 296 kN, C0 365 kN, Pu 8.8 kN, limiting speed 2000 r/min, mass 33500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6244." } ], "cross_ref": [ { "equiv_sku": "6244", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6300-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "RSR low-friction seals on 6300-RSR run faster than contact-seal 6300-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6300-2RS instead.", "The non-contact lip of 6300-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6300-RSR.", "SKF catalogues the low-friction seal as 6300-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-RSR bearing?", "a": "A 6300-RSR deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6300-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6300-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2RSL — two low-friction non-contact elastomer seals, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 26000 r/min, mass 53 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300-RSR." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7300", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6301-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 60, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "RSR low-friction seals on 6301-RSR run faster than contact-seal 6301-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6301-2RS instead.", "The non-contact lip of 6301-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6301-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-RSR bearing?", "a": "A 6301-RSR deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6301-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2RSL — two low-friction non-contact elastomer seals, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 22000 r/min, mass 60 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301-RSR." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7301", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6302-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 85, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "RSR low-friction seals on 6302-RSR run faster than contact-seal 6302-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6302-2RS instead.", "The non-contact lip of 6302-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6302-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6302-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-RSR bearing?", "a": "A 6302-RSR deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6302-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6302-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2RSL — two low-friction non-contact elastomer seals, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 19000 r/min, mass 85 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302-RSR." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7302", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6303-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "RSR low-friction seals on 6303-RSR run faster than contact-seal 6303-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6303-2RS instead.", "The non-contact lip of 6303-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6303-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 17000 r/min limiting speed, closer to the open bearing's 34000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303-RSR bearing?", "a": "A 6303-RSR deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6303-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6303-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303-2RSL — two low-friction non-contact elastomer seals, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 17000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6303-RSR." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6304-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 15.9, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "RSR low-friction seals on 6304-RSR run faster than contact-seal 6304-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6304-2RS instead.", "The non-contact lip of 6304-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6304-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 15.9/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-RSR bearing?", "a": "A 6304-RSR deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6304-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2RSL — two low-friction non-contact elastomer seals, 20×52×15 mm per ISO 15. Quoted values: C 15.9 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304-RSR." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7304", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6305-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "RSR low-friction seals on 6305-RSR run faster than contact-seal 6305-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6305-2RS instead.", "The non-contact lip of 6305-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6305-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-RSR bearing?", "a": "A 6305-RSR deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6305-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6305-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2RZ — two low-friction non-contact elastomer seals, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 13000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305-RSR." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7305", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6306-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "RSR low-friction seals on 6306-RSR run faster than contact-seal 6306-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6306-2RS instead.", "The non-contact lip of 6306-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6306-RSR.", "SKF catalogues the low-friction seal as 6306-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-RSR bearing?", "a": "A 6306-RSR deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6306-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 30 mm bore?", "a": "The '3' is the medium diameter series: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 6206 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6306-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2RZ — two low-friction non-contact elastomer seals, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 11000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306-RSR." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7306", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6308-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "RSR low-friction seals on 6308-RSR run faster than contact-seal 6308-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6308-2RS instead.", "The non-contact lip of 6308-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6308-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6308-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-RSR bearing?", "a": "A 6308-RSR deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6308-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6308-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2RZ — two low-friction non-contact elastomer seals, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 8500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308-RSR." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7308", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324", "brand": "SKF", "manufacturer_designation": "SKF 6324", "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": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "The open 6324 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×260×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6324 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6324.", "The open 6324 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6324-2Z (shields) and 6324-2RSH (contact seals), not suffix-free 6324.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324 bearing?", "a": "A 6324 deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6324 bore code work?", "a": "The last two digits of 6324 are bore code 24, giving 24 × 5 = 120 mm bore. The 260 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6324 mean?", "a": "A bare 6324 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6324?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324 — the open (unsealed) execution, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 3400 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324." } ], "cross_ref": [ { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6324-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "Contact seals add drag and heat: 6324-2RS runs slower and cooler-limited than the open 6324; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6324-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 55 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6324-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6324-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6324-RS1 exists for arrangements that lubricate through the open side; fitting 6324-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324-2RS bearing?", "a": "A 6324-2RS deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6324 bore code work?", "a": "The last two digits of 6324 are bore code 24, giving 24 × 5 = 120 mm bore. The 260 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6324-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6324-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 1700 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324-2RS." } ], "cross_ref": [ { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6324-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6324-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 5600, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "ZZ shields are non-contact: 6324-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6324-2RS for that.", "Shielded 6324-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6324-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6324-2Z (one shield: 6324-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6324-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6324-2Z for high-contamination positions.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324-ZZ bearing?", "a": "A 6324-ZZ deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6324 bore code work?", "a": "The last two digits of 6324 are bore code 24, giving 24 × 5 = 120 mm bore. The 260 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6324-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6324-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324-2Z — two non-contact sheet-metal shields, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 2800 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324-ZZ." } ], "cross_ref": [ { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6324-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6326", "brand": "SKF", "manufacturer_designation": "SKF 6326", "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": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 216, "fatigue_load_limit_kN": 6.3, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 15000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6326 carries bore code 26 = 130 mm. Outside diameter 280 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 130 mm bore through a 280 mm OD and 58 mm width; the heavier rolling elements also trade away some speed versus a 6226.", "The open 6326 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×280×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6326 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6326-C3. No clearance suffix means normal CN clearance.", "The open 6326 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6326-2Z (shields) and 6326-2RSH (contact seals), not suffix-free 6326.", "The 229/216 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6326 bearing?", "a": "A 6326 deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6326 bore code work?", "a": "The last two digits of 6326 are bore code 26, giving 26 × 5 = 130 mm bore. The 280 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6326 mean?", "a": "A bare 6326 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 130 mm bore?", "a": "The '3' is the medium diameter series: 280×58 mm, 75.0 mm radial section at 130 mm bore, carrying more load than a 6226 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6326?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6326 — the open (unsealed) execution, 130×280×58 mm per ISO 15. Quoted values: C 229 kN, C0 216 kN, Pu 6.3 kN, limiting speed 3200 r/min, mass 15000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6326." } ], "cross_ref": [ { "equiv_sku": "6326", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6328", "brand": "SKF", "manufacturer_designation": "SKF 6328", "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": "steel_stamped_J", "dynamic_load_kN": 251, "static_load_kN": 245, "fatigue_load_limit_kN": 7.1, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 18500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6328 carries bore code 28 = 140 mm. Outside diameter 300 mm and width 62 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 140 mm bore through a 300 mm OD and 62 mm width; the heavier rolling elements also trade away some speed versus a 6228.", "The open 6328 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×300×62 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6328 units.", "Shaft and housing fillets must clear the bearing chamfer so the 62 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6328 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6328-2Z (shields) and 6328-2RSH (contact seals), not suffix-free 6328.", "The 251/245 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6328 bearing?", "a": "A 6328 deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6328 bore code work?", "a": "The last two digits of 6328 are bore code 28, giving 28 × 5 = 140 mm bore. The 300 mm outside diameter and 62 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6328 mean?", "a": "A bare 6328 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 140 mm bore?", "a": "The '3' is the medium diameter series: 300×62 mm, 80.0 mm radial section at 140 mm bore, carrying more load than a 6228 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6328?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6328 — the open (unsealed) execution, 140×300×62 mm per ISO 15. Quoted values: C 251 kN, C0 245 kN, Pu 7.1 kN, limiting speed 3000 r/min, mass 18500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6328." } ], "cross_ref": [ { "equiv_sku": "6328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6330", "brand": "SKF", "manufacturer_designation": "SKF 6330", "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": "steel_stamped_J", "dynamic_load_kN": 276, "static_load_kN": 285, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 23000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6330 carries bore code 30 = 150 mm. Outside diameter 320 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 150 mm bore through a 320 mm OD and 65 mm width; the heavier rolling elements also trade away some speed versus a 6230.", "The open 6330 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×320×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6330 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 320 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6330.", "The open 6330 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6330-2Z (shields) and 6330-2RSH (contact seals), not suffix-free 6330.", "The 276/285 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6330 bearing?", "a": "A 6330 deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6330 bore code work?", "a": "The last two digits of 6330 are bore code 30, giving 30 × 5 = 150 mm bore. The 320 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6330 mean?", "a": "A bare 6330 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 150 mm bore?", "a": "The '3' is the medium diameter series: 320×65 mm, 85.0 mm radial section at 150 mm bore, carrying more load than a 6230 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6330?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6330 — the open (unsealed) execution, 150×320×65 mm per ISO 15. Quoted values: C 276 kN, C0 285 kN, Pu 7.8 kN, limiting speed 2800 r/min, mass 23000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6330." } ], "cross_ref": [ { "equiv_sku": "6330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6334", "brand": "SKF", "manufacturer_designation": "SKF 6334", "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": "steel_stamped_J", "dynamic_load_kN": 312, "static_load_kN": 340, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 31000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6334 carries bore code 34 = 170 mm. Outside diameter 360 mm and width 72 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 170 mm bore through a 360 mm OD and 72 mm width; the heavier rolling elements also trade away some speed versus a 6234.", "The open 6334 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×360×72 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6334 units.", "Shaft and housing fillets must clear the bearing chamfer so the 72 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6334 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6334-2Z (shields) and 6334-2RSH (contact seals), not suffix-free 6334.", "The 312/340 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6334 bearing?", "a": "A 6334 deep-groove ball bearing has a 170 mm bore, 360 mm outer diameter and 72 mm width (6.693 × 14.173 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6334 bore code work?", "a": "The last two digits of 6334 are bore code 34, giving 34 × 5 = 170 mm bore. The 360 mm outside diameter and 72 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6334 mean?", "a": "A bare 6334 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 170 mm bore?", "a": "The '3' is the medium diameter series: 360×72 mm, 95.0 mm radial section at 170 mm bore, carrying more load than a 6234 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6334?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6334 — the open (unsealed) execution, 170×360×72 mm per ISO 15. Quoted values: C 312 kN, C0 340 kN, Pu 8.8 kN, limiting speed 2400 r/min, mass 31000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6334." } ], "cross_ref": [ { "equiv_sku": "6334", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6336", "brand": "SKF", "manufacturer_designation": "SKF 6336", "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": "steel_stamped_J", "dynamic_load_kN": 351, "static_load_kN": 405, "fatigue_load_limit_kN": 10.4, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 36500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6336 carries bore code 36 = 180 mm. Outside diameter 380 mm and width 75 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 180 mm bore through a 380 mm OD and 75 mm width; the heavier rolling elements also trade away some speed versus a 6236.", "The open 6336 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×380×75 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6336 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 380 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6336.", "The open 6336 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6336-2Z (shields) and 6336-2RSH (contact seals), not suffix-free 6336.", "The 351/405 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6336 bearing?", "a": "A 6336 deep-groove ball bearing has a 180 mm bore, 380 mm outer diameter and 75 mm width (7.087 × 14.961 × 2.953 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6336 bore code work?", "a": "The last two digits of 6336 are bore code 36, giving 36 × 5 = 180 mm bore. The 380 mm outside diameter and 75 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6336 mean?", "a": "A bare 6336 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 180 mm bore?", "a": "The '3' is the medium diameter series: 380×75 mm, 100.0 mm radial section at 180 mm bore, carrying more load than a 6236 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6336?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6336 — the open (unsealed) execution, 180×380×75 mm per ISO 15. Quoted values: C 351 kN, C0 405 kN, Pu 10.4 kN, limiting speed 2200 r/min, mass 36500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6336." } ], "cross_ref": [ { "equiv_sku": "6336", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6338", "brand": "SKF", "manufacturer_designation": "SKF 6338", "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": "steel_stamped_J", "dynamic_load_kN": 371, "static_load_kN": 430, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 3400, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 42000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6338 carries bore code 38 = 190 mm. Outside diameter 400 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 190 mm bore through a 400 mm OD and 78 mm width; the heavier rolling elements also trade away some speed versus a 6238.", "The open 6338 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×400×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6338 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6338-C3. No clearance suffix means normal CN clearance.", "The open 6338 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6338-2Z (shields) and 6338-2RSH (contact seals), not suffix-free 6338.", "The 371/430 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6338 bearing?", "a": "A 6338 deep-groove ball bearing has a 190 mm bore, 400 mm outer diameter and 78 mm width (7.48 × 15.748 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6338 bore code work?", "a": "The last two digits of 6338 are bore code 38, giving 38 × 5 = 190 mm bore. The 400 mm outside diameter and 78 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6338 mean?", "a": "A bare 6338 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 190 mm bore?", "a": "The '3' is the medium diameter series: 400×78 mm, 105.0 mm radial section at 190 mm bore, carrying more load than a 6238 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6338?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6338 — the open (unsealed) execution, 190×400×78 mm per ISO 15. Quoted values: C 371 kN, C0 430 kN, Pu 10.8 kN, limiting speed 2200 r/min, mass 42000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6338." } ], "cross_ref": [ { "equiv_sku": "6338", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6403", "brand": "SKF", "manufacturer_designation": "SKF 6403", "series": "6400-series", "type": "deep_groove", "d_mm": 17, "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": 10.8, "fatigue_load_limit_kN": 0.455, "reference_speed_rpm": 28000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6403 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6403 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6403 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6403 units.", "Shaft and housing fillets must clear the bearing chamfer so the 17 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6403 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6403-2Z (shields) and 6403-2RSH (contact seals), not suffix-free 6403.", "The 22.9/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6403 bearing?", "a": "A 6403 deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6403 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6403 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6403 mean?", "a": "A bare 6403 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 17 mm bore?", "a": "The '4' is the heavy diameter series: 62×17 mm, 22.5 mm radial section at 17 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6403?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6403 — the open (unsealed) execution, 17×62×17 mm per ISO 15. Quoted values: C 22.9 kN, C0 10.8 kN, Pu 0.455 kN, limiting speed 18000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6403." } ], "cross_ref": [ { "equiv_sku": "6403-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6403-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6415", "brand": "SKF", "manufacturer_designation": "SKF 6415", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 153, "static_load_kN": 114, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 5800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6415 carries bore code 15 = 75 mm. Outside diameter 190 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6415 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×190×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6415 units.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6415 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6415-2Z (shields) and 6415-2RSH (contact seals), not suffix-free 6415.", "The 153/114 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6415 bearing?", "a": "A 6415 deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6415 bore code work?", "a": "The last two digits of 6415 are bore code 15, giving 15 × 5 = 75 mm bore. The 190 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6415 mean?", "a": "A bare 6415 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 75 mm bore?", "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6415?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6415 — the open (unsealed) execution, 75×190×45 mm per ISO 15. Quoted values: C 153 kN, C0 114 kN, Pu 4.15 kN, limiting speed 5000 r/min, mass 5800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6415." } ], "cross_ref": [ { "equiv_sku": "6415-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6415-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6416", "brand": "SKF", "manufacturer_designation": "SKF 6416", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 163, "static_load_kN": 125, "fatigue_load_limit_kN": 4.5, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 6850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6416 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×200×48 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6416 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6416 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6416-2Z (shields) and 6416-2RSH (contact seals), not suffix-free 6416.", "The 163/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6416 bearing?", "a": "A 6416 deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6416 bore code work?", "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6416 mean?", "a": "A bare 6416 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 80 mm bore?", "a": "The '4' is the heavy diameter series: 200×48 mm, 60.0 mm radial section at 80 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6416?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6416 — the open (unsealed) execution, 80×200×48 mm per ISO 15. Quoted values: C 163 kN, C0 125 kN, Pu 4.5 kN, limiting speed 4800 r/min, mass 6850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6416." } ], "cross_ref": [ { "equiv_sku": "6416-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6416-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6417", "brand": "SKF", "manufacturer_designation": "SKF 6417", "series": "6400-series", "type": "deep_groove", "d_mm": 85, "D_mm": 210, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 137, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 8050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 85 mm bore (210 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6417 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×210×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6417 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6417.", "The open 6417 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6417-2Z (shields) and 6417-2RSH (contact seals), not suffix-free 6417.", "The 174/137 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6417 bearing?", "a": "A 6417 deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6417 bore code work?", "a": "The last two digits of 6417 are bore code 17, giving 17 × 5 = 85 mm bore. The 210 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6417 mean?", "a": "A bare 6417 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 85 mm bore?", "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6417?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6417 — the open (unsealed) execution, 85×210×52 mm per ISO 15. Quoted values: C 174 kN, C0 137 kN, Pu 4.75 kN, limiting speed 4500 r/min, mass 8050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6417." } ], "cross_ref": [ { "equiv_sku": "6417-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6417-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6418", "brand": "SKF", "manufacturer_designation": "SKF 6418", "series": "6400-series", "type": "deep_groove", "d_mm": 90, "D_mm": 225, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 150, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 9800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6418 carries bore code 18 = 90 mm. Outside diameter 225 mm and width 54 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6418 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×225×54 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6418 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6418 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6418-2Z (shields) and 6418-2RSH (contact seals), not suffix-free 6418.", "The 186/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6418 bearing?", "a": "A 6418 deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6418 bore code work?", "a": "The last two digits of 6418 are bore code 18, giving 18 × 5 = 90 mm bore. The 225 mm outside diameter and 54 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6418 mean?", "a": "A bare 6418 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 90 mm bore?", "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6418?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6418 — the open (unsealed) execution, 90×225×54 mm per ISO 15. Quoted values: C 186 kN, C0 150 kN, Pu 5 kN, limiting speed 4300 r/min, mass 9800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6418." } ], "cross_ref": [ { "equiv_sku": "6418-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6418-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the 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": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] } ]